阅读说明：本技术 一种水轮机组传动转换调速机及其操作方法 (Transmission conversion speed regulator of hydraulic turbine unit and operation method thereof ) 是由 林剑洪 于 2019-12-18 设计创作，主要内容包括：本发明提供一种水轮机组传动转换调速机及其操作方法及其操作方法,其结构包括前支撑座、传动转换调节装置、水轮机进水涡管、配封盘、吊环板、后支撑座、支脚,前支撑座顶端采用电焊的方式固定连接于水轮机进水涡管左侧端,配封盘通过嵌入的方式安装在水轮机进水涡管表面,本发明通过引卸机构在水流冲击时,能够借助水流冲击的压力,主动将水流进行转向卸开,令其冲击落点在右钵片上进行重合,进而能够缩小水轮机进行机械能转换均存在一个初始驱动值,若是出现水流流速处于持续最大化的状态,能够通过固定钵片中的卸启机构对右钵片进行调控,进而能够令其主动进行卸流减压,能够主动将转换功率控制在稳定值以内,防止传动转化的轮叶因为负载过高出现崩坏的状况。(The invention provides a transmission conversion speed regulator of a hydraulic turbine unit and an operation method thereof, wherein the transmission conversion speed regulator comprises a front support seat, a transmission conversion adjusting device, a hydraulic turbine inlet vortex tube, a matched sealing disc, a suspension ring plate, a rear support seat and support legs, wherein the top end of the front support seat is fixedly connected to the left end of the hydraulic turbine inlet vortex tube in an electric welding mode, and the matched sealing disc is installed on the surface of the hydraulic turbine inlet vortex tube in an embedding mode. The conversion power can be actively controlled within a stable value, and the condition that the blade of the transmission conversion is broken due to overhigh load is prevented.)

1. The utility model provides a turbine unit transmission conversion speed governing machine, its structure includes preceding supporting seat (1), transmission conversion adjusting device (2), hydraulic turbine intake scroll (3), joins in marriage seal dish (4), suspension ring board (5), back supporting seat (6), stabilizer blade (7), its characterized in that:

the top end of the front supporting seat (1) is fixedly connected to the left end of the water turbine inlet scroll (3) in an electric welding mode, the sealing plate (4) is installed on the surface of the water turbine inlet scroll (3) in an embedded mode, the rear supporting seat (6) is fixedly connected to the right end of the water turbine inlet scroll (3) in an electric welding mode, the supporting legs (7) are fixedly installed at the bottom end of the water turbine inlet scroll (3), the transmission conversion adjusting device (2) is installed inside the water turbine inlet scroll (3) in an embedded mode, and the suspension ring plate (5) is welded with the water turbine inlet scroll (3);

the transmission conversion adjusting device (2) comprises a lock knob (a1), a transmission conversion mechanism (a2), an outer sealing disc (a3), an inner sealing disc (a4) and an adjusting shaft sleeve (a5), wherein the lock knob (a1) is installed inside the outer sealing disc (a3) in an embedding mode, the outer sealing disc (a3) is welded with the inner sealing disc (a4), the adjusting shaft sleeve (a5) is embedded in the axial position of the inner sealing disc (a4), the adjusting shaft sleeve (a5) is arranged in the middle of the transmission conversion mechanism (a2), and the outer sealing disc (a3) is installed on the front end face of the water turbine water inlet scroll (3) in an embedding mode;

the transmission conversion mechanism (a2) comprises a punched bowl blade (a21), an outer ring (a22), an inner shaft (a23) and a rotary disc (a24), wherein the inner shaft (a23) is installed at the axial center of the rotary disc (a24) in an embedded mode, the outer ring (a22) is fixedly connected with the rotary disc (a24), and the punched bowl blade (a21) is welded with the outer ring (a 22).

2. A hydro-turbine transmission conversion speed governor according to claim 1, characterized in that: the punched bowl blade (a21) comprises a drawing and unloading mechanism (a211), a left bowl piece (a212) and a right bowl piece (a213), the drawing and unloading mechanism (a211) is fixedly connected with the left bowl piece (a212), the left side surface of the right bowl piece (a213) is mutually attached to the right side surface of the left bowl piece (a212), and the bottom end of the left bowl piece (a212) is fixedly connected to the outer ring surface of the outer connecting ring (a22) in an electric welding manner.

3. A hydro-turbine transmission conversion speed governor according to claim 2, characterized in that: the drawing and unloading mechanism (a211) comprises reverse supporting clamping pieces (qq1), a discharging piece (qq2), a near pulling strip (qq3), a far pulling strip (qq4), a middle pulling strip (qq5), side connecting strips (qq6) and a matching piece (qq7), wherein the reverse supporting clamping pieces (qq1) are provided with two parts and fixedly arranged at the upper side and the lower side of the back of the discharging piece (qq2), the far pulling strip (qq4) is positioned at the right side of the near pulling strip (qq3), the middle pulling piece (qq5) is positioned in the middle position of the two side connecting strips (qq6), the matching piece (qq7) is provided with two parts and fixedly connected with the discharging piece (qq2), and the middle pulling piece (qq5), the side connecting strips (qq6) and the matching piece (qq7) are connected together by the near pulling strip (qq 3).

4. A hydro-turbine transmission conversion speed governor according to claim 2, characterized in that: left alms bowl piece (a212) is including fixed alms bowl piece (q1), unload and open mechanism (q2), connecting band (q3), hinge axle (q4), fixed alms bowl piece (q1) inside is equipped with unloads and opens mechanism (q2), connecting band (q3) and right alms bowl piece (a213) fixed connection together, fixed alms bowl piece (q1) copper pipe hinge axle (q4) are connected with right alms bowl piece (a 213).

5. The hydro-turbine transmission conversion speed governor as defined in claim 4, wherein: unload and open mechanism (q2) and include inner tube (q21), atmoseal stopper (q22), supplementary position of borrowing air strip (q23), pipe (q24), spacing seal (q25), inner tube (q21) inside is equipped with atmoseal stopper (q22), supplementary position of borrowing air strip (q23) fixed laminating is installed in inner tube (q21) lateral surface, with inner tube (q21) structure as an organic whole, pipe (q24) and supplementary position of borrowing air strip (q23) inside switch-on.

6. The hydro-turbine transmission conversion speed governor and the operation method thereof according to any one of claims 1 to 5, wherein:

according to the invention, when water flow is input through a water turbine inlet vortex pipe (3), a water flow bundle enters a rotating state by means of an inner shaft (a23) when impacting a impacted pot blade (a21), so that conversion from hydrodynamic energy to mechanical energy is realized, and in the water flow impacting state, when a guide and unloading mechanism (a211) is impacted, the water flow pressure can press the guide and unloading mechanism, and as a reverse support clamping piece (qq1) is arranged at the back of the guide and unloading mechanism, a unloading piece (qq2) is supported at the top end of the guide and unloading piece (qq2) is supported by a branch handle of the guide and unloading piece (qq2), a limit passive pressing point of the unloading piece (qq2) is mainly controlled by the guide and unloading piece (qq2) is enabled to still keep a stable oblique angle when being impacted by exceeding the bearing force;

meanwhile, the tail ends of the far pull belt (qq4) and the middle pull sheet (qq5) are sunken downwards, the pressing limit point of the far pull belt (qq4) and the tail end of the middle pull sheet (qq5) is lower than the sheet unloading (qq2), the far pull belt (qq3) and the far pull belt (qq4) which are stretched passively are mainly used for keeping an arc state, then the impact flow can be unloaded to the right bowl sheet (a213), and the driving force can be reduced by the centralized impact of the point.

Technical Field

The invention belongs to the field of transmission equipment, and particularly relates to a transmission conversion speed regulator of a hydraulic turbine set and an operation method thereof.

Background

The water turbine mainly converts the impact kinetic energy of the flowing water flow to form mechanical energy capable of driving a power machine, belongs to the turbine machinery in fluid machinery, and a speed regulator plays a key role in the output size of the mechanical energy conversion.

Based on the above description, the inventor finds that the existing transmission conversion speed-adjusting machine for the hydraulic turbine set and the operation method thereof mainly have the following defects, such as:

because the hydraulic turbine speed governing is mainly to the flow that the regulation lets in rivers, and then reach the flow control to hydraulic turbine internal transmission, and hydraulic turbine self is in its and the effect that does not have the speed governing of conversion part of speed regulator, and every hydraulic turbine carries out mechanical energy conversion and all has an initial drive value, when rivers impact value is less than the drive value, transmission equipment can't convert, and when the fault appears in the speed regulator, if the velocity of flow is in lasting maximize, the blade of the inside transmission conversion of hydraulic turbine can be in overload conversion state, thereby it leads to the lubrication to consume with higher speed to appear interior overheat easily, the condition that the blade that transmission conversion collapses badly appears easily.

Disclosure of Invention

In order to solve the technical problems, the invention provides a transmission conversion speed regulator of a hydraulic turbine set and an operation method thereof, and aims to solve the problems that the speed regulation of the hydraulic turbine mainly aims at regulating the flow of introduced water flow so as to achieve the flow control of the internal transmission of the hydraulic turbine, the hydraulic turbine is positioned in the speed regulator and does not have the speed regulation function with a conversion component, each hydraulic turbine has an initial driving value for mechanical energy conversion, when the water flow impact value is lower than the driving value, transmission equipment cannot be converted, and when the speed regulator breaks down, if the flow rate is continuously maximized, the internal transmission conversion wheel blades of the hydraulic turbine are in an overload conversion state, the internal shaft is easily overheated so as to cause accelerated lubrication consumption, and the transmission conversion wheel blades are easily broken.

Aiming at the defects of the prior art, the invention discloses a transmission conversion speed regulator of a hydraulic turbine set and an operation method thereof, and aims and effects are achieved by the following specific technical means: the utility model provides a turbine unit transmission conversion speed governing machine and operation method thereof, its structure includes preceding supporting seat, transmission conversion adjusting device, the turbine vortex pipe that intakes, joins in marriage a set, suspension ring board, back supporting seat, stabilizer blade, the mode fixed connection that the preceding supporting seat top adopted the electric welding in the turbine vortex pipe left side end of intaking, join in marriage the mode that seals the set and install on the turbine vortex pipe surface of intaking through the embedding, the mode fixed connection that the back supporting seat adopted the electric welding in the turbine vortex pipe right-hand member of intaking, stabilizer blade fixed mounting is in turbine vortex pipe bottom of intaking, transmission conversion adjusting device installs inside the turbine vortex pipe of intaking through the mode of embedding, suspension ring board and turbine vortex pipe of intaking weld mutually.

The transmission conversion adjusting device comprises a lock button, a transmission conversion mechanism, an outer sealing disc, an inner connecting disc and an adjusting shaft sleeve, wherein the lock button is installed inside the outer sealing disc in an embedded mode, the outer sealing disc is welded with the inner connecting disc, the adjusting shaft sleeve is embedded in the position of a shaft center of the inner connecting disc, the adjusting shaft sleeve is arranged in the middle of the transmission conversion mechanism, and the outer sealing disc is installed on the front end face of a water inlet vortex pipe of the water turbine in an embedded mode.

Preferably, the transmission conversion mechanism comprises a punched bowl blade, an external ring, an inner shaft and a rotary table, the inner shaft is installed at the axis position of the rotary table in an embedded mode, the external ring is fixedly connected with the rotary table, the punched bowl blade is welded with the external ring, the punched bowl blade can rotate around the inner shaft by means of impact force generated when being impacted by water flow, and further initial conversion of mechanical energy is generated, and twelve punched bowl blades are arranged on the external ring.

Preferably, the punched bowl blade comprises a drawing and unloading mechanism, a left bowl piece and a right bowl piece, the drawing and unloading mechanism is fixedly connected with the left bowl piece, the left side surface of the right bowl piece is mutually attached to the right side surface of the left bowl piece, the bottom end of the left bowl piece is fixedly connected to the outer ring surface of the external ring in an electric welding mode, the drawing and unloading mechanism fixed on the left bowl piece can guide the left bowl piece towards the right side in the water flow impact process, so that the impact force of the drawing and unloading mechanism can be intensively acted on the right bowl piece, and the impact force of the drawing and unloading mechanism can still be directly acted on the left bowl piece after being deformed.

As preferred, draw and unload the mechanism and include reverse support clamping piece, unload piece, nearly stretching strap, far away stretching strap, well drawing piece, side strip, join in marriage the stator, reverse support clamping piece is equipped with two and fixed mounting together and unloads both sides about the piece back, far away the stretching strap is located nearly stretching strap right side, well drawing piece is located two side strip intermediate positions, join in marriage the stator and be equipped with two altogether and all with unload piece fixed connection together, nearly stretching strap links together drawing piece, side strip, join in marriage the stator, reverse support clamping piece top is supporting and is unloading the piece, and its intermediate position also receives branch handle support of own simultaneously, then can make it keep the limit pressure point at pressurized in-process, makes and unload the piece and keep stable slant angle.

Preferably, the left bowl piece comprises a fixed bowl piece, a release mechanism, a connecting band and a hinge shaft, the release mechanism is arranged inside the fixed bowl piece, the connecting band is fixedly connected with the right bowl piece, the fixed bowl piece copper pipe hinge shaft is connected with the right bowl piece, and when the right bowl piece on the right side of the left bowl piece is subjected to overload impact force, the right bowl piece can draw the connecting band to extend towards the side surface in a rotating mode, so that the impact pressure of water flow can be actively released towards the side surface, the pressure borne by the right bowl piece is further reduced, and therefore the rotating speed can be regulated and controlled within a stable range.

As preferred, unload and open the mechanism and include inner tube, air lock stopper, supplementary borrow gas strip, pipe, spacing sealing, the inside air lock stopper that is equipped with of inner tube, the fixed laminating of supplementary borrow gas strip is installed at the inner tube lateral surface, with inner tube structure as an organic whole, the pipe is with the inside switch-on of supplementary borrow gas strip, supplementary borrow gas strip can carry out the constant voltage with the gas of its extrusion and collect when the air lock stopper moves towards the export side, and ensure that the inside pressure value of being pressed the chamber is in stable state to when the air lock stopper is put back, export inside gas again, make the pressure stability of inside realization inner loop.

Compared with the prior art, the invention has the following advantagesAdvantageous effects：

According to the invention, when water flow impacts, the water flow can be actively turned and unloaded by virtue of the pressure of the water flow impact through the guide unloading mechanism, so that impact falling points of the water flow are superposed on the right bowl piece, and further, the initial driving value of the hydraulic turbine for mechanical energy conversion can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of a transmission conversion speed regulator of a hydraulic turbine set and an operation method thereof.

Fig. 2 is a schematic front view of the internal structure of the transmission conversion adjusting device.

Fig. 3 is a detailed structural diagram of the interior of the transmission conversion mechanism.

Fig. 4 is a side detailed structural schematic diagram of the punched pot leaf.

Fig. 5 is a detailed structural diagram of the interior of the unloading mechanism.

Fig. 6 is a side view of the reverse clamping piece.

Fig. 7 is a schematic view of the assembly structure of the left bowl piece and the right bowl piece.

Fig. 8 is a schematic view showing the internal structure of the release mechanism in detail.

In the figure: front support seat-1, transmission conversion adjusting device-2, turbine inlet scroll-3, matched sealing disc-4, suspension ring plate-5, rear support seat-6, support leg-7, lock button-a 1, transmission conversion mechanism-a 2, outer sealing disc-a 3, inner sealing disc-a 4, adjusting shaft sleeve-a 5, punched bowl-a 21, outer connecting ring-a 22, inner shaft-a 23, rotary disc-a 24, drawing and unloading mechanism-a 211, left bowl-a 212, right bowl-a 213, reverse supporting clip-qq 1, unloading clip-qq 2, near drawing clip-qq 3, far drawing clip-qq 4, middle drawing clip-qq 5, side drawing clip-qq 6, matched fixing clip-qq 7, fixed bowl-q 1, drawing mechanism-q 2, connecting band-q 3, connecting shaft-4-q inner barrel 21, inner barrel-q-b 26, 67q-q-b 35, and the balance fixing clip-q-b-, Air-tight plug-q 22, auxiliary borrowing air bar-q 23, conduit-q 24 and limit seal-q 25.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in figures 1 to 6:

the invention provides a transmission conversion speed regulator of a hydraulic turbine set and an operation method thereof, the structure of the device comprises a front supporting seat 1, a transmission conversion adjusting device 2, a water turbine inlet scroll 3, a matching sealing disc 4, a suspension ring plate 5, a rear supporting seat 6 and supporting legs 7, the top end of the front supporting seat 1 is fixedly connected with the left end of the water turbine inlet scroll 3 in an electric welding way, the sealing disc 4 is arranged on the surface of the water turbine inlet scroll 3 in an embedded mode, the rear support seat 6 is fixedly connected to the right end of the water turbine inlet scroll 3 in an electric welding mode, the supporting legs 7 are fixedly installed at the bottom end of the water turbine inlet scroll 3, the transmission conversion adjusting device 2 is installed inside the water turbine inlet scroll 3 in an embedded mode, and the lifting ring plate 5 is welded with the water turbine inlet scroll 3.

The transmission conversion adjusting device 2 comprises a lock knob a1, a transmission conversion mechanism a2, an outer seal disc a3, an inner seal disc a4 and an adjusting shaft sleeve a5, wherein the lock knob a1 is installed inside the outer seal disc a3 in an embedded mode, the outer seal disc a3 is welded with the inner seal disc a4, the adjusting shaft sleeve a5 is embedded in the axial position of the inner seal disc a4, the adjusting shaft sleeve a5 is arranged in the middle of the transmission conversion mechanism a2, and the outer seal disc a3 is installed on the front end face of the water turbine inlet scroll 3 in an embedded mode.

The transmission conversion mechanism a2 comprises a punched bowl blade a21, an outer ring a22, an inner shaft a23 and a rotary disc a24, wherein the inner shaft a23 is installed at the axial center of the rotary disc a24 in an embedded mode, the outer ring a22 is fixedly connected with the rotary disc a24, the punched bowl blade a21 is welded with the outer ring a22, the punched bowl blade a21 can rotate around the inner shaft a23 by impact force generated when being impacted by water flow, so that initial conversion of mechanical energy is generated, and twelve punched bowl blades a21 are arranged on the outer ring a 22.

The punched bowl blade a21 comprises a pulling and unloading mechanism a211, a left bowl piece a212 and a right bowl piece a213, the pulling and unloading mechanism a211 and the left bowl piece a212 are fixedly connected together, the left side surface of the right bowl piece a213 is attached to the right side surface of the left bowl piece a212, the bottom end of the left bowl piece a212 is fixedly connected to the outer ring surface of the external ring a22 in an electric welding mode, the pulling and unloading mechanism a211 fixed on the left bowl piece a212 can guide the water flow towards the right side in the water flow punching process, the punching force can be intensively acted on the right bowl piece a213, and the punching force of the pulling and unloading mechanism 211 a after being deformed can still directly act on the left bowl piece a 212.

The drawing and unloading mechanism a211 comprises a reverse supporting clamping piece qq1, a discharging piece qq2, a near drawing strip qq3, a far drawing strip qq4, a middle drawing piece qq5, a side strip qq6 and a matching piece qq7, wherein the reverse supporting clamping piece qq1 is provided with two pieces and fixedly arranged on the upper side and the lower side of the back of the discharging piece qq2, the far drawing strip qq4 is arranged on the right side of the near drawing strip qq3, the middle drawing piece qq5 is arranged in the middle of the two side strips qq6, the matching piece qq7 is provided with two pieces and fixedly connected with the discharging piece qq2, the near drawing strip qq3 connects the middle drawing piece qq5, the side strip qq6 and the matching piece qq7, the top end of the reverse supporting piece qq1 supports the discharging piece qq2, the middle part of the middle clamping piece qq is simultaneously supported by a branch handle of the clamping piece, and then the clamping piece qq2 can keep the oblique angle of the discharging piece in the pressing process.

The specific use mode and function of the embodiment are as follows:

in the invention, when water flow is input through the water turbine inlet vortex tube 3, a water flow bundle enters a rotating state by means of the inner shaft a23 when impacting the impacted bowl blade a21, the conversion of water kinetic energy to mechanical energy is realized, in the state of water flow impact, when the drawing and unloading mechanism a211 is impacted, the pressure of the water flow can press the water flow, because the back part of the drawing and unloading mechanism a is provided with the reverse supporting clamping sheet qq1, the top end of the drawing and unloading mechanism qq2 props against the unloading sheet qq2, because the middle part of the unloading sheet qq2 is supported by a branch handle of the drawing and the limit passive pressing point of the unloading sheet qq2 is mainly controlled by the reverse supporting clamping sheet qq1, when the unloading sheet qq2 is impacted by exceeding the bearing force, the stable oblique angle can be kept, meanwhile, the far drawing belt qq4 and the middle drawing sheet qq5 are sunken towards the tail end, the pressed limit point is lower than the unloading sheet qq2, the near qq3 and the drawing belt which is passively stretched and the far drawing belt 4 is kept in, the point concentrated impact can reduce the driving force.

Example 2

As shown in fig. 7 to 8:

the invention provides a transmission conversion speed regulator of a hydraulic turbine unit and an operation method thereof, wherein a left bowl sheet a212 comprises a fixed bowl sheet q1, a release mechanism q2, a connecting belt q3 and a hinge shaft q4, the release mechanism q2 is arranged in the fixed bowl sheet q1, the connecting belt q3 is fixedly connected with a right bowl sheet a213, the fixed bowl sheet q1 copper pipe hinge shaft q4 is connected with the right bowl sheet a213, and the right bowl sheet a213 on the right side of the left bowl sheet a212 can pull the connecting belt q3 to extend towards the side surface in a rotating way when being subjected to overload impact force, so that the impact pressure of water flow can be actively released towards the side surface, the pressure borne by the right bowl sheet a213 can be reduced, and the rotating speed can be regulated and controlled in a stable range.

The unloading mechanism q2 comprises an inner cylinder q21, an air seal plug q22, an auxiliary position-borrowing air strip q23, a guide pipe q24 and a limiting seal q25, the air seal plug q22 is arranged inside the inner cylinder q21, the auxiliary position-borrowing air strip q23 is fixedly attached to the outer side surface of the inner cylinder q21, the inner cylinder q21 and the guide pipe q24 are of an integrated structure, the guide pipe q 3552 is communicated with the inside of the auxiliary position-borrowing air strip q23, the auxiliary position-borrowing air strip q23 can conduct constant-pressure collection on gas pressed out of the air seal plug q22 when the air seal plug q22 moves towards the outlet side, the pressure value of an internal pressed cavity is ensured to be in a stable state, and when the air seal plug q22 is reset, the internal gas is output again, so that the internal circulation pressure is stabilized.

The specific use mode and function of the embodiment are as follows:

in the invention, when the impact force borne by the right bowl piece a213 is overloaded, the impact force is higher than the constraint adsorption force of the impact bowl blade q21 on the external connection ring q22, the external connection ring q22 is driven to move towards the direction of the limit seal q25 by the connection belt q3, because a part of gas exists in the middle of the two, the gas pressure in the area is balanced, when the external connection ring q22 is pressed, the external connection ring q22 can be temporarily borrowed towards the auxiliary borrow gas strip q23 through the connection belt q24, the sealing end of the gas seal q22 close to the inner cylinder q21 is in a low pressure state, the gas seal q22 generates continuous attraction force, the gas entering the auxiliary borrow gas strip q23 after being pressed by the gas seal q22 simultaneously has a pressing force on the gas seal q22, a counterimpact force is formed by the resultant force of the resultant force and the external impact force, the connection belt q3 drives the right bowl piece q213 as the force receiving area of the resultant force, the right bowl piece a213 which is intensively acted by the hinge shaft 4 and rotates towards the back of the bowl, the impact force is removed to a certain degree, so that the rotating speed of the motor is kept within a safe load value.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.