Motor drive device for reducing load on rotating shaft
阅读说明:本技术 减小旋转轴上的载荷的马达驱动装置 (Motor drive device for reducing load on rotating shaft ) 是由 金珉技 于 2018-12-18 设计创作,主要内容包括:本发明涉及一种马达驱动装置,该马达驱动装置能够在初始操作磁性轴承时减轻旋转轴上的载荷负担。当转子和定子初始对准时,马达驱动装置可以向多个线圈中距地面最远的线圈施加比其他线圈更大的电流,以减小所述定子和所述转子的初始对准所需的悬浮力。(The present invention relates to a motor drive device capable of reducing a load burden on a rotating shaft at the time of initial operation of a magnetic bearing. When the rotor and the stator are initially aligned, the motor driving apparatus may apply a larger current to a coil farthest from the ground among the plurality of coils than to the other coils to reduce a levitation force required for the initial alignment of the stator and the rotor.)
1. A motor drive apparatus, comprising:
a housing (105);
a stator (110) fixed to an inner surface of the housing and including a plurality of teeth wound with a plurality of coils, respectively;
a rotor (120) disposed in the stator and rotated by a magnetic field generated in the plurality of coils;
a rotating shaft (125) extending in an axial direction of the rotor and horizontally arranged;
a magnetic bearing (130, 135) configured to generate a magnetic force levitating the rotating shaft in an axial direction; and
a controller configured to apply current to the plurality of coils and to control operation of the magnetic bearing,
wherein the controller applies currents of different magnitudes to the plurality of coils, and
a first tooth on which a coil forming a minimum angle with a line parallel to a gravitational acceleration direction among winding center axes around which the plurality of coils are respectively wound is arranged above the rotation shaft.
2. The motor drive apparatus according to claim 1, wherein:
the plurality of teeth include first to third teeth on which first to third coils are wound, respectively;
the first to third teeth are arranged at equally spaced angles based on the rotation axis; and is
The first tooth is disposed farther from the ground than the second tooth and the third tooth.
3. The motor drive of claim 2, wherein the plurality of teeth further includes fourth to sixth teeth arranged opposite to the first to third teeth based on the rotation axis.
4. The motor drive according to any one of claims 1 to 3, wherein the first tooth is arranged perpendicular to a ground surface in contact with the housing or parallel to the gravitational acceleration direction.
5. The motor drive apparatus according to any one of claims 1 to 3, wherein:
the first tooth is arranged within a range in which a line (L2) perpendicular to a ground surface in contact with the housing or a line parallel to the gravitational acceleration direction forms a first angle (theta); and is
The first angle is less than or equal to 60 °.
6. The motor drive of claim 1, further comprising backup roller bearings arranged at least above and below the rotating shaft and arranged closer to the rotating shaft than the magnetic bearings.
7. The motor drive of claim 6, wherein the magnetic bearing is disposed closer to the rotor than the backup roller bearing.
8. A method of controlling a drive of a motor, the motor comprising:
a stator (110) including a plurality of teeth each wound with a plurality of coils;
a rotor (120) disposed in the stator and rotated by a magnetic field generated in the plurality of coils;
a rotating shaft (125) extending in an axial direction of the rotor and horizontally arranged; and
a magnetic bearing (130, 135) configured to generate a magnetic force levitating the rotating shaft in an axial direction,
wherein, when the motor is initially driven, a maximum current is applied to the coil forming a minimum angle with a gravitational acceleration direction among winding central axes on which the plurality of coils are respectively wound, to levitate the rotation shaft.
9. The method of claim 8, wherein the maximum current is applied to the coils corresponding to the winding central axes arranged within a range forming a first angle (θ) with a line parallel to the gravitational acceleration direction among the winding central axes around which the plurality of coils are respectively wound, when the motor is initially driven, to levitate the rotation shaft.
10. The method of claim 8 or 9, wherein:
after the current is applied to the plurality of coils, the magnetic bearing is controlled to generate a magnetic force; and is
Reducing a magnitude of the current applied to the plurality of coils when the magnetic force is generated in the magnetic bearing.
Technical Field
The present invention relates to a motor drive device capable of reducing a load on a rotating shaft when initially operating a magnetic bearing.
Background
Generally, a chiller system is a cooling device or a refrigerating device that supplies cold water to an object requiring the cold water, such as an air conditioner, a refrigerator, and the like. The chiller system includes a compressor, a condenser, an expander, and an evaporator, in which a refrigerant is circulated.
Here, the compressor includes a magnetic bearing that levitates a rotating shaft rotating in a motor by a magnetic force to compress a large amount of refrigerant at a high rate.
Here, a conventional chiller system is shown with reference to korean laid-open patent (KR 10-2015-.
Fig. 1 is a view illustrating a conventional chiller system. Fig. 2 is a sectional view illustrating a compressor included in the conventional chiller system of fig. 1.
Referring to fig. 1, the conventional chiller system includes: a compressor 10 that compresses a refrigerant; a
The suction valve 50 controls the flow of refrigerant evaporated in the
Referring to fig. 2, the compressor 10 includes a motor part composed of a stator 11 provided with a plurality of teeth and a rotor 12 rotating in the stator 11.
The stator 11 is made of a metal material. A plurality of coils C1, C2, and C3 are wound on a plurality of teeth of the stator 11, respectively, and current flows through each of the plurality of coils C1, C2, C3, thereby generating a magnetic field.
The rotor 12 is composed of a magnetic material having a magnetic force, and rotates due to a magnetic field generated by a plurality of coils C1, C2, and C3.
However, when the motor is in a stopped state, the first force F1 and the second force F2 are generated in the rotor 12, the first force F1 acts downward due to the weight of the rotor 12, and the second force F2 acts between the rotor 12 made of a magnetic material and the stator 11 made of a metal material.
The rotor 12 is moved downward from the centerline H2 of the stator 11 by the first force F1 and the second force F2 (e.g., state a).
In order to drive the motor in a stopped state, the center of the rotor 12 and the center of the stator 11 should coincide with each other.
For this, the motor part further includes a magnetic bearing 13, and the magnetic bearing 13 generates a magnetic force for moving the rotor 12 upward.
The magnetic bearings 13 are disposed at upper and lower sides of the rotor 12, and generate a third force F4, which F4 pushes the rotor 12 to the center line H2 of the stator 11.
Due to the third force F4, the center of the rotor 12 coincides with the center line H2 of the stator 11 (e.g., state B). That is, during the initial alignment for driving the motor, the center lines of the rotor 12 and the stator 11 coincide with each other.
However, there is a problem in that the magnetic bearing 13 must generate a greater levitation force as the weight of the rotor 12 increases and the magnetic force of the magnetic body constituting the rotor 12 increases.
Further, when the magnetic bearing 13 generating a larger levitation force in the motor is provided, there are problems in that the overall size and manufacturing cost of the motor increase, and many restrictions occur in the manufacture of the motor.
In addition, conventionally, there is a problem that since the positions of the teeth of the stator 11 are arbitrarily arranged, the magnitude of the levitation force that should be generated in the magnetic bearing 13 varies with the motor.
Disclosure of Invention
Technical problem
The present invention is directed to providing a motor driving apparatus capable of reducing the magnitude of levitation force required to initially align a rotor and a stator.
Further, the present invention is directed to providing a motor driving apparatus capable of reducing the size and manufacturing cost of a magnetic bearing required for initially aligning a rotor.
In addition, the present invention is directed to providing a motor driving apparatus capable of enhancing reliability of motor control by unifying an alignment structure of a stator.
Objects of the present invention are not limited to the above objects and other objects and advantages of the present invention, which are not mentioned, may be understood by the following description and may be more clearly understood by exemplary implementations of the present invention. Further, it can be easily understood that the objects and advantages of the present invention can be achieved by the means shown in the claims and the combination thereof.
Technical scheme
In the motor driving device according to the present invention, when the rotor and the stator are initially aligned, a levitation force required to initially align the rotor and the stator can be reduced by applying a larger current to a coil arranged farthest from the ground among the plurality of coils than to the other coils.
Further, in the motor drive device according to the present invention, by generating an additional levitation force by means of the magnetic bearing after applying a current to the plurality of coils to generate the levitation force, the magnitude of the levitation force generated in the magnetic bearing can be reduced. Therefore, the size and manufacturing cost of the magnetic bearing included in the motor can be reduced.
In addition, in the motor driving device according to the present invention, by uniformly arranging the plurality of teeth provided in the stator such that the positions of the plurality of teeth are symmetrical with respect to a reference line perpendicular to the ground, the reliability of the motor control can be improved.
Specifically, one aspect of the present invention provides a motor drive device including: a housing (105); a stator (110) fixed to an inner surface of the housing and including a plurality of teeth wound with a plurality of coils, respectively; a rotor (120) disposed in the stator and rotated by a magnetic field generated in the plurality of coils; a rotating shaft (125) extending in an axial direction of the rotor and horizontally arranged; a magnetic bearing (130, 135) configured to generate a magnetic force levitating the rotating shaft in an axial direction; and a controller configured to apply currents to the plurality of coils and to control an operation of the magnetic bearing, wherein the controller applies currents of different magnitudes to the plurality of coils, and a first tooth is arranged above the rotation shaft, and a coil forming a minimum angle with a line parallel to a gravitational acceleration direction among winding center axes around which the plurality of coils are respectively wound is wound on the first tooth.
The plurality of teeth may include first to third teeth on which first to third coils are wound, respectively; the first to third teeth may be arranged at the same interval angle based on the rotation axis; and the first tooth may be disposed farther from the ground than the second tooth and the third tooth.
The plurality of teeth may further include fourth to sixth teeth arranged opposite to the first to third teeth based on the rotation axis.
The first tooth may be arranged perpendicular to a ground surface in contact with the housing or parallel to the gravitational acceleration direction.
The first teeth may be disposed within a range in which a line (L2) perpendicular to a ground surface in contact with the housing or a line parallel to the gravitational acceleration direction forms a first angle (θ); and the first angle may be less than or equal to 60 °.
The motor drive device may further include backup roller bearings that are arranged at least above and below the rotation shaft and are arranged closer to the rotation shaft than the magnetic bearings. The magnetic bearing may be disposed closer to the rotor than the support roller bearing.
Further, another aspect of the present invention provides a method of controlling driving of a motor, the motor including: a stator (110) including a plurality of teeth each wound with a plurality of coils; a rotor (120) disposed in the stator and rotated by a magnetic field generated in the plurality of coils; a rotating shaft (125) extending in an axial direction of the rotor and horizontally arranged; and a magnetic bearing (130, 135) configured to generate a magnetic force levitating the rotating shaft in an axial direction.
When the motor is initially driven, the maximum current may be applied to the coil forming the minimum angle with the gravitational acceleration direction among winding central axes around which the plurality of coils are respectively wound, to levitate the rotation axis.
Further, when the motor is initially driven, the maximum current may be applied to the coils corresponding to the winding central axes arranged within a range forming a first angle (θ) with a line parallel to the gravitational acceleration direction among the winding central axes around which the plurality of coils are respectively wound to levitate the rotation shaft.
According to the method of controlling driving, the magnetic bearing may be controlled to generate a magnetic force after the current is applied to the plurality of coils; and when the magnetic force is generated in the magnetic bearing, the magnitude of the current applied to the plurality of coils may be reduced.
Advantageous effects
In the motor driving device according to the present invention, when the rotor and the stator are initially aligned, the levitation force of the magnetic bearing required to initially align the rotor and the stator can be reduced by applying a larger current to a coil arranged farthest from the ground among the plurality of coils than to the other coils. Thus, the required performance of the magnetic bearing may be reduced because the rotor and stator may initially be aligned only with the magnetic bearing that generates the relatively small levitation force. Therefore, since the motor can normally operate using a relatively inexpensive magnetic bearing, the manufacturing cost and the production cost of the motor driving apparatus can be reduced.
Further, in the motor drive device according to the present invention, by generating an additional levitating force in the magnetic bearing after applying a current to the plurality of coils to generate the levitating force, the magnitude of the levitating force generated in the magnetic bearing can be reduced. Therefore, the size and manufacturing cost of the magnetic bearing can be reduced, and the overall size and manufacturing cost of the motor can also be reduced. Further, with the free space created by the reduction in size of the magnetic bearing, it is possible to accommodate more refrigerant in the motor or achieve greater output.
In addition, in the motor driving device according to the present invention, by uniformly arranging the plurality of teeth provided in the stator so that the positions of the plurality of teeth may be symmetrical with respect to a reference line perpendicular to the ground, the same control manner may be applied to the motor. Therefore, the initial manual setting process can be omitted in the same type of motor, and the load of the magnetic bearing can be reduced to enhance the reliability of the motor control.
In describing the following specific items for carrying out the present invention, the specific effects of the present invention will be mentioned together with the above effects.
Drawings
Fig. 1 is a view illustrating a conventional chiller system.
Fig. 2 is a sectional view illustrating a compressor included in the chiller system of fig. 1.
Fig. 3 is a block diagram illustrating a motor driving apparatus according to an exemplary embodiment of the present invention.
Fig. 4 is a sectional view showing the motor part in fig. 3.
Fig. 5 is a sectional view for describing a section taken along line a-a in fig. 4.
Fig. 6 is a flowchart for describing a method of controlling a motor driving apparatus according to an exemplary embodiment of the present invention.
Fig. 7 is a graph for describing the magnitude of current applied in operation S110 of fig. 6.
Fig. 8 is a view for describing a method of initially aligning a motor driving apparatus according to an exemplary embodiment of the present invention.
Fig. 9 is a sectional view illustrating a motor driving apparatus according to another exemplary embodiment of the present invention.
Fig. 10 is a sectional view illustrating a motor driving apparatus according to still another exemplary embodiment of the present invention.
Reference numerals
100: the motor portion 105: shell body
107: the support portion 110: stator
120: the rotor 125: rotating shaft
127: the plate 130: magnetic bearing
140: supporting roller bearing 150: guide bearing
200: controller
Detailed Description
The above objects, features and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily carry out the technical spirit of the present invention. In the description of the present invention, when detailed description of related art related to the present invention unnecessarily obscures the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred exemplary implementations of the present invention will be described in detail with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Hereinafter, with reference to fig. 3 to 10, a motor driving apparatus according to some exemplary implementations of the present invention will be described.
Fig. 3 is a block diagram illustrating a motor driving apparatus according to an exemplary embodiment of the present invention. Fig. 4 is a sectional view showing the motor part in fig. 3.
Referring to fig. 3, the motor driving apparatus according to an exemplary embodiment of the present invention includes a motor part 100 and a controller 200.
The motor part 100 includes various types of motors.
Specifically, the motor part 100 may include an Alternating Current (AC) motor, a Direct Current (DC) motor, a brushless DC motor, a reluctance motor, and the like.
For example, the motor part 100 may include a surface-mounted permanent magnet synchronous motor (SMPMSM), an Interior Permanent Magnet Synchronous Motor (IPMSM), a synchronous reluctance motor (SynRM), and the like.
The controller 200 may control the operation of the motor part 100. The controller 200 may control operations of components included in the motor part 100.
For example, the controller 200 may control: the magnitude of the current applied to the plurality of coils C included in the motor part 100; and the magnitude of the magnetic force of the
In this case, the controller 200 may reduce the magnitude of the magnetic force generated in the
The detailed description of the above will be described below.
Referring to fig. 4, the motor part 100 includes a
The
In the drawings, the
The side circumferential surface of the
The
The stator may have a structure in which a plurality of metal plates shown in fig. 5 are laminated along the axial direction O. The stator may be formed of a metal material guiding magnetic lines. The coil C may be wound on the teeth of the stator in which the metal plates are laminated.
The plurality of teeth may be wound with different coils C1, C2, and C3. Currents having different phases are applied to the coil C, and thus a magnetic field that rotates the
The
The
The side surface (i.e., the outer circumferential surface) of the
The rotation shaft 125 may extend from the center of the
The
When the motor part 100 operates, the
On the other hand, when the motor part 100 is stopped, the
In one exemplary implementation, the backup roller bearings 140 and 145 may surround the outer circumferential surface of the rotation shaft 125 in the circumferential direction. In another exemplary embodiment, the support roller bearings 140 and 145 may support the outer circumferential surface of the rotary shaft 125 at least from the upper and lower portions, and each of the support roller bearings 140 and 145 may have a vertically separated structure.
In an exemplary implementation, the back-up roller bearings 140 and 145 rotatably support the rotation shaft 125 rotating together with the
When the rotation shaft 125 and the
The
The
The
The
Hereinafter, description will be made based on the
In addition, the
In this case, the same current may be applied to both of the
The back-up roller bearing 140 serves to limit the maximum moving range of the rotating shaft 125. Therefore, the
The backup roller bearing 140 may be composed of two parts divided into upper and lower parts like the
In this case, the support roller bearing 140 may be disposed closer to the rotational shaft 125 than the
The guide bearing 150 serves to guide the position of the
A plate 127 is formed on one end of the rotation shaft 125. Here, the guide bearings 150 are disposed at one side and the other side with respect to the plate 127.
That is, in the pair of guide bearings 150, the first member is arranged to face the first surface of the plate 127, and the second member is arranged to face the second surface (surface opposite to the first surface) of the plate 127.
A constant current is applied to the guide bearing 150 to generate a magnetic force on the plate 127. In this case, in the plate 127, attraction or repulsion is generated between the pair of guide bearings 150.
Accordingly, the plate 127 and the pair of guide bearings 150 may maintain a state of being spaced apart from each other. Therefore, the pair of guide bearings 150 can restrict the movement of the rotation shaft 125 in the axial direction. That is, the pair of guide bearings 150 may limit the position of the rotation shaft 125 in the axial direction.
In this case, the magnitude of the magnetic force generated in the guide bearing 150 may be controlled by the controller 200.
However, in some exemplary implementations, the guide bearing 150 may be omitted.
Fig. 5 is a sectional view for describing a section taken along line a-a in fig. 4.
Referring to fig. 5, the
Here, the
The
As described above, the
The first teeth 112 may be arranged on a second straight line L2 perpendicular to the
In this case, the first teeth 112 may be disposed farther from the upper surface of the
Further, in another exemplary implementation of the present invention, the first teeth 112 may be arranged within the first angle θ based on the second straight line L2. In this case, the first angle θ may be an acute angle.
The first teeth 112 may be arranged at first guide lines L each forming a first angle θ with the second straight line L2g1And a second lead line Lg2In the meantime. Here, the first angle θ may be less than or equal to 60 °, but the present invention is not limited thereto.
The first tooth 112 may be disposed on the first guide line Lg2And a second guide line Lg2In the first areas a11 and a12 in between.
The second tooth 114 may be disposed on the first guide line Lg1And the first line L1, and the third tooth 116 may be disposed in the second guide line L2g2And a third region A3 between the first line L1.
In this case, the first coil C1 is wound on the first tooth 112, the second coil C2 is wound on the second tooth 114, and the third coil C3 is wound on the third tooth 116.
Therefore, a virtual axis (first winding center axis) forming the center of the winding of the first coil C1 around the circumference of the first tooth 112 may be arranged at the first guide line Lg1And a second guide line Lg2In the meantime. A virtual axis (second winding center axis) forming the winding center of the second coil C2 around the circumference of the second tooth 114 may be arranged in the first guide line Lg1And a first line L1. In addition, a virtual axis (third winding center axis) forming the winding center of the second coil C3 around the circumference of the third tooth 116 may be arranged in the second guide line Lg2And a first line L1. Thus, the axis forming the smallest angle with the direction of gravitational acceleration may be the first winding central axis. When the first angle θ is decreased, the angle formed by the first winding center axis and the gravitational acceleration direction tends to be further decreased.
A current is applied to each of the coils C1, C2, and C3, and the controller 200 may control the current applied to each of the coils C1, C2, and C3. When a current is applied to each of the coils C1, C2, and C3, a magnetic field is generated.
During operation of the motor part 100, the controller 200 applies alternating currents of different phases to each of the coils C1, C2, and C3.
However, in the operation initialization step of the motor part 100, the controller 200 may align the
In this case, the controller 200 may apply a larger current to the first coil C1 of the
In this case, since the attractive force between the first coil C1 and the
Accordingly, the controller 200 may match the central axes of the
Fig. 6 is a flowchart for describing a method of controlling a motor driving apparatus according to an exemplary embodiment of the present invention. Fig. 7 is a graph for describing the magnitude of current applied in operation S110 of fig. 6.
Referring to fig. 6, a control method for initializing driving of a motor driving apparatus according to an exemplary embodiment of the present invention includes: a current is applied to each of the coils C1, C2, and C3 by the controller 200 (S110).
In this case, the controller 200 applies a different current to each of the coils C1, C2, and C3. The controller 200 may apply a different DC current to each of the coils C1, C2, and C3.
Specifically, referring to fig. 7, the controller 200 applies the first current IaIs applied to the first coil C1, and a second current I is appliedbAnd a third current IcTo the second coil C2 and the third coil C3, respectively.
In this case, the first current IaMay be larger than the second current IbAnd a third current IcAnd the polarities may be opposite to each other.
For example, the first current IaMay be greater than the size m1A second current IbAnd a third current IcIs twice the size m 2. In addition, the first current IaMay be a positive current, and the second current IbAnd a third current IcMay be a negative current. However, this is only an embodiment, and the present invention is not limited thereto.
Therefore, the maximum force pulling the
The controller 200 may adjust the current applied to each of the coils C1, C2, and C3 to adjust the magnitude of the levitation force of the
Subsequently, referring again to fig. 6, the controller 200 generates a magnetic force levitating the rotation shaft 125 in the
In operation S110, when the levitation force that moves the
Accordingly, the magnitude of the magnetic force required in the
Since the size and manufacturing cost of the
Subsequently, the controller 200 decreases the magnitude of the current applied to each of the coils C1, C2, and C3 (S130). Accordingly, the controller 200 may match the central axis of the
Subsequently, since the central axis of the
In some exemplary implementations of the present invention, operation S130 of the above-described operations S110 to S140 may be omitted.
Fig. 8 is a view for describing a method of initially aligning a motor driving apparatus according to an exemplary embodiment of the present invention.
Referring to fig. 8, in the motor driving device according to an exemplary embodiment of the present invention, the
State a shows a case where the motor section 100 is stopped. The first force F1 acts downward by the weight of the
Due to the first and second forces F1 and F2, the
In this case, the second force F2 may increase as the
In order to drive the motor in a stopped state, the center of the
Subsequently, in state B, the controller 200 applies a different magnitude of DC current to each of the coils C1, C2, and C3. Specifically, the controller 200 may apply a larger current to the first coil C1 of the
In this case, the attractive force between the first coil C1 and the
That is, the
In the drawings, although the case where the
Subsequently, in the state C, the controller 200 generates a magnetic force in the
Meanwhile, the controller 200 may match the central axis of the
In this case, the resultant of the first force F1 and the second force F2 is the same as the resultant of the third force F3 and the fourth force F4.
However, the magnitude of the second force F2 varies according to the position of the
To compensate for this, the controller 200 may precisely adjust the current applied to each of the coils C1, C2, and C3 to match the central axis of the
Further, in the operation initialization process, since the controller 200 generates the third force F3 that moves the
Accordingly, in the present invention, since the
Since the motor part 100 can normally operate even in the case where the relatively inexpensive
Further, with the free space created by reducing the size of the
In addition, by arranging the plurality of teeth 112, 114, and 116 provided in the
That is, in the motor part 100 according to the present invention, the initial manual setting process may be omitted by using the same initial alignment method, and the load of the
Fig. 9 is a sectional view illustrating a motor driving apparatus according to another exemplary embodiment of the present invention. Fig. 10 is a sectional view illustrating a motor driving apparatus according to still another exemplary embodiment of the present invention. Hereinafter, description of the same components as those in the motor driving device according to one exemplary embodiment of the present invention will be omitted, and differences will be mainly described.
Referring to fig. 9, the motor part 101 according to another exemplary embodiment of the present invention includes a stator 210 and a
The stator 210 includes a plurality of teeth 211, 212, 213, 214, 215, and 216.
For example, the stator 210 may include six teeth 211, 212, 213, 214, 215, and 216, and the coils C11, C12, C21, C22, C31, and C32 may be individually wound around the plurality of teeth 211, 212, 213, 214, 215, and 216, respectively. In this case, the first coil C11 may be wound transversely on the first tooth 211.
Hereinafter, as shown in the drawings, an embodiment in which the stator 210 has six teeth 211, 212, 213, 214, 215, and 216 will be described.
Here, the first coil C11 is wound on the first tooth 211, and the fourth coil C12 is wound on the fourth tooth 214 facing the first tooth 211.
In this case, the first and fourth teeth 211 and 214 may be disposed on a second straight line L2 perpendicular to a first straight line L1 parallel to the ground.
As another example, the first teeth 112 may be disposed on first guide lines L that respectively form first angles θ with the second straight lines L2g1And a second guide line Lg2In the meantime.
Here, the first angle θ may be less than or equal to 60 °, but the present invention is not limited thereto.
Compared with the other winding center axes, a virtual axis (first winding center axis) forming the winding center of the first coil C1 wound around the first tooth 211 and a virtual axis (fourth winding center axis) forming the winding center of the fourth coil C12 wound around the fourth tooth 214 may be arranged at an angle (gravitational acceleration direction) closest to the second straight line L2. During an initial alignment operation of the motor part 100, the controller 200 may apply a larger DC current to the first coil C11 and the fourth coil C12 than to the other coils C21, C22, C31, and C32.
In this case, a force directed to the upper side of the stator 210 is applied to the
At this time, the direction of the force applied to the
Since the force applied to the
Subsequently, although not clearly shown in the drawings, the controller 200 generates a magnetic force that levitates the rotating shaft 125 in the
That is, in the present invention, the controller 200 may generate a force to move the
In fig. 10, a motor part 102 of a motor driving apparatus according to still another exemplary embodiment of the present invention includes a stator 310 and a rotor 320.
The stator 310 includes a plurality of teeth 315. A plurality of coils Ca1, Ca2, Cb1, Cb2, Cc1 and Cc2 may be wound on the stator 310.
The coils Ca1, Ca2, Cb1, Cb2, Cc1 and Cc2 may be wound on different regions a11, a12, a21, a22, a31 and a32 of the stator 310, respectively.
Here, the regions a11, a12, a21, a22, a31, and a32 may be set to the same size.
For example, the first coil Ca1 may be wound on the plurality of teeth 315 in the first region a21 of the stator 310 to alternate inner and outer surfaces with respect to the body of the stator 310.
As described above, the second coil Ca2 may be wound on the plurality of teeth 315 in the second region a31 of the stator 310 to alternate inner and outer surfaces with respect to the body of the stator 310.
In this case, the first and second regions a21 and a31 may be arranged to be symmetrical to a second straight line L2 perpendicular to the first straight line L1, the first straight line L1 being parallel to the ground.
Here, during the initial alignment operation of the motor part 100, the controller 200 may apply a larger DC current to the first and second coils Ca1 and Ca2 than to the other coils Cb1, Cb2, Cc1 and Cc 2.
In this case, a force directed to the upper side of the stator 310 is applied to the rotor 320. In this case, the direction of the force applied to the rotor 320 is perpendicular to the winding direction of the first coil Ca1 or the second coil Ca 2.
In this case, since the force applied to the rotor 320 can be easily understood by the "ampere-right law", a detailed description will be omitted hereinafter.
Subsequently, although not clearly shown in the drawings, the controller 200 generates a magnetic force that levitates the rotating shaft 125 in the
That is, in the present invention, first, the controller 200 may generate a force to move the
Accordingly, in the present invention, since the
Since the motor part according to some exemplary implementations of the present invention can normally operate even when the relatively inexpensive
As described above, although the present invention is described with reference to the exemplary drawings, the present invention is not limited to the exemplary embodiments and the drawings disclosed in the specification, and it is apparent that those skilled in the art can make various modifications within the technical spirit of the present invention. Furthermore, although the action and effect of the configuration according to the present invention have not been explicitly described above in describing the exemplary implementation of the present invention, it should naturally be recognized that there is a predictable action by the configuration.
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