阅读说明：本技术 一种外转子双凸极永磁电机 (Outer rotor doubly salient permanent magnet motor ) 是由 陶学恒 史立伟 丁富康 吕炳昌 卞玉康 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种外转子双凸极永磁电机,由定子铁心、电枢绕组、转子铁心、永磁体、定子固定架、电机轴和机壳组成,所述一种外转子双凸极永磁电机的定转子铁心均为模块化结构,转子铁心分为4个扇形转子模块,每个转子模块上包括2个转子极,定子铁心分为3个扇形定子模块,每个定子铁心上分布着2个定子极；每个定子铁心上均布置一个切向充磁的矩形永磁体。本发明设计的电机结构,定子和转子均模块化使得定转子的某一极发生故障时,电机其他模块还可以正常运行；定子铁心和转子铁心冲压时,转子铁心上的两个转子极同时分别伸入到定子铁心的U型凹槽内,很好地避免了冲压时定子模块的凹槽部位硅钢板材料的浪费,定转子模块化结构也提高了电机工作的可靠性。(The invention discloses an outer rotor doubly salient permanent magnet motor, which consists of a stator core, an armature winding, a rotor core, a permanent magnet, a stator fixing frame, a motor shaft and a casing, wherein the stator core and the rotor core of the outer rotor doubly salient permanent magnet motor are of a modular structure, the rotor core is divided into 4 fan-shaped rotor modules, each rotor module comprises 2 rotor poles, the stator core is divided into 3 fan-shaped stator modules, and 2 stator poles are distributed on each stator core; each stator core is provided with a rectangular permanent magnet which is magnetized tangentially. According to the motor structure designed by the invention, the stator and the rotor are modularized, so that when a certain pole of the stator and the rotor breaks down, other modules of the motor can also normally operate; when the stator core and the rotor core are stamped, two rotor poles on the rotor core simultaneously and respectively extend into the U-shaped grooves of the stator core, waste of silicon steel plate materials at groove positions of the stator module during stamping is well avoided, and the working reliability of the motor is improved due to the modular structure of the stator and the rotor.)

1. An outer rotor doubly salient permanent magnet motor comprises a stator core, an armature winding, a rotor core, a permanent magnet, a stator fixing frame, a motor shaft and a machine shell; the method is characterized in that:

the rotor core of the outer rotor doubly salient permanent magnet motor is divided into 4 rotor modules, each rotor module comprises 2 rotor poles, the two rotor poles are symmetrically distributed on the rotor core module, and the 4 rotor cores are uniformly distributed in the shell along the circumferential direction; the stator core is divided into 3 fan-shaped stator modules, 2 stator poles are distributed on each stator core, and the 3 stator cores are uniformly distributed on the stator core fixing frame in the circumferential direction; after the stator iron core and the rotor iron core are installed, a disc-shaped stator and rotor structure is formed;

two rectangular grooves are formed in the outer diameter of each fan-shaped stator core, the grooves are symmetrically distributed on the stator core, the depth of each rectangular groove is equal to the radial length of one rotor pole, and the width of each groove is equal to the width of one rotor pole;

the bottom of the stator core groove is arc-shaped, the top of the rotor pole is also arc-shaped, the radius of the arc is not smaller than that of the arc at the bottom of the groove, and the arc length of the arc does not exceed that of the arc at the bottom of the groove;

the permanent magnet slots are arranged at the center line of one stator core module, and the rectangular permanent magnets are radially placed in the permanent magnet slots of the stator core and tangentially magnetized.

2. The outer rotor doubly salient permanent magnet machine of claim 1, wherein: when the stator core and the rotor core are stamped, two rotor poles on the rotor core respectively extend into the rectangular grooves of the stator core at the same time, and a rotor core stamped sheet and a stator core stamped sheet are obtained after stamping.

3. The outer rotor doubly salient permanent magnet machine of claim 1, wherein: the stator and the rotor are both of modular structures, so that when a certain pole of the stator and the rotor breaks down, other modules of the motor have fault-tolerant operation capability.

4. The outer rotor doubly salient permanent magnet machine of claim 1, wherein: the outer diameter of the fan-shaped stator core module is arc-shaped, and the circle center of the arc is determined according to the position when the fan-shaped stator core module is installed; and during stamping, the position of the circle center of the fan-shaped stator core is different from that of the stator core.

Technical Field

The invention relates to an outer rotor doubly salient permanent magnet motor, and belongs to the technical field of special motors.

Background

In recent years, electric vehicles are emerging as a clean and pollution-free vehicle. Electric vehicle drive systems are critical in determining their performance and economy. The driving motors used in the prior electromotion mainly comprise a direct current motor, an induction motor, a brushless direct current motor and a double salient pole permanent magnet motor. The doubly salient permanent magnet motor has the advantages of flexible control, simple structure, high reliability, excellent electrical performance and the like, and becomes one of better driving systems of the electric vehicle.

The concept of a doubly salient permanent magnet machine comes directly from the switched reluctance machine, which, although only adds permanent magnets to the stator yoke, brings about a fundamental change. The doubly salient permanent magnet motor mainly inherits the simplicity of the structure of the switched reluctance motor, and comprises a doubly salient structure and a concentrated winding form. Another advantage of the double salient pole structure is that low speeds are easily achieved.

The double salient pole permanent magnet motor has the following advantages that the electromagnetic torque generated by the interaction of the permanent magnetic steel and the excitation winding has the following advantages: the permanent magnet greatly reduces the winding inductance and the change rate of the inductance, and reduces the reluctance torque. In a winding power-on period, the reluctance torque is irrelevant to the current direction, the torques in the inductance rising area and the inductance falling area are mutually counteracted, and the resultant torque is small. If a constant current value is applied, the resultant torque is zero, so that the reluctance torque is small in the doubly salient permanent magnet motor. The magnetic field reaction torque is the dominant electromagnetic torque, related to the direction of the current. It can be seen from the above that the doubly salient permanent magnet motor realizes the purpose of being capable of being electrified in one switching period, overcomes the defect of low material utilization rate in principle, and solves the problem of current commutation due to small inductance of the winding at the non-aligned position. The doubly salient permanent magnet motor has higher efficiency than other motors, and the high efficiency is reflected in a wide speed regulation range, so the doubly salient permanent magnet motor inevitably becomes the main driving stream of the electric vehicle.

The outer rotor doubly salient permanent magnet motor is based on structural innovation of the doubly salient permanent magnet motor. The basic structure of the external rotor doubly salient permanent magnet motor is similar to that of the existing doubly salient permanent magnet motor, the stator and the rotor are both in a salient tooth socket structure, the stator and the rotor iron core are formed by laminating silicon steel sheets, the stator is provided with concentrated windings and permanent magnets, and the rotor is free of windings. But the stator and the rotor are not integral structures any more, but are divided into blocks, and the stator and the rotor are both modularized. The improvement can ensure that the motor can normally run when a certain pole is in fault, thereby improving the reliability of the motor; meanwhile, silicon steel plate materials can be saved in a mode that the stator modules and the rotor modules are mutually nested during production, and the effects of saving cost, reducing the weight of the motor and improving production efficiency are achieved.

Disclosure of Invention

The invention aims to provide an outer rotor doubly salient permanent magnet motor, which improves the stator and rotor structure of the motor and saves the usage amount of silicon steel plates while ensuring the function of the motor.

The above purpose is realized by the following technical scheme:

the utility model provides an outer rotor biconvex utmost point permanent-magnet machine, includes stator core, armature winding, rotor core, permanent magnet, stator mount, motor shaft and casing, its characterized in that: the rotor core of the outer rotor doubly salient permanent magnet motor is divided into 4 rotor modules, each rotor module comprises 2 rotor poles, the two rotor poles are symmetrically distributed on the rotor core module, and the 4 rotor cores are uniformly distributed in the shell along the circumferential direction; the stator core is divided into 3 fan-shaped stator modules, 2 stator poles are distributed on each stator core, and the 3 stator cores are uniformly distributed on the stator core fixing frame in the circumferential direction; and after the stator iron core and the rotor iron core are installed, a disc-shaped stator and rotor structure is formed.

Two rectangular grooves are formed in the outer diameter of each fan-shaped stator core, the grooves are symmetrically distributed on the stator core, the depth of each rectangular groove is equal to the radial length of one rotor pole, and the width of each groove is equal to the width of one rotor pole.

The bottom of the groove of the stator core is arc-shaped, the top of the rotor pole is also arc-shaped, the radius of the arc of the stator core is not smaller than that of the arc at the bottom of the groove, and the arc length of the arc does not exceed that of the arc at the bottom of the groove.

The permanent magnet slots are arranged at the center line of one stator core module, and the rectangular permanent magnets are radially placed in the permanent magnet slots of the stator core and tangentially magnetized.

The outer rotor doubly salient permanent magnet motor is characterized in that: when the stator core and the rotor core are stamped, two rotor poles on the rotor core respectively extend into the rectangular grooves of the stator core at the same time, and a rotor core stamped sheet and a stator core stamped sheet are obtained after stamping.

The outer rotor doubly salient permanent magnet motor is characterized in that: the stator and the rotor are modularized, so that when a certain pole of the stator and the rotor breaks down, other modules of the motor can normally operate.

The outer rotor doubly salient permanent magnet motor is characterized in that: the outer diameter of the fan-shaped stator core module is arc-shaped, the circle center of the arc is determined according to the position during installation, and the circle center position of the arc is different from the circle center position of the stator core during stamping.

The invention has the following beneficial effects:

(1) according to the modularized motor stator and the modularized motor rotor, each module works independently, so that the isolation performance of the motor is good, and the motor can work by means of other modules after a certain module breaks down;

(2) the invention adopts the idea of the mutual nesting structure of the stator and the rotor during stamping, reduces the plate waste at the groove part of the stator core during stamping, saves the stamping material to the maximum extent and reduces the production cost;

(3) the stator and the rotor are modularized, so that the placement positions of the stator and the rotor are flexible, and the wiring mode of an armature winding on the stator is flexible;

(4) on the basis of ensuring the performance of the motor, the structure greatly lightens the mass of the motor.

Drawings

FIG. 1 is a structural diagram of a stator and a rotor of an outer rotor doubly salient permanent magnet motor in the process of stamping;

FIG. 2 is a structural diagram of a stator and a rotor of an outer rotor doubly salient permanent magnet motor according to the invention installed in the motor;

fig. 3 is a block diagram of a single rotor core module of an outer rotor doubly salient permanent magnet machine of the present invention;

fig. 4 is a block diagram of a single stator core module of an outer rotor doubly salient permanent magnet machine of the present invention.

In the above figures, 1, stator iron core, 2, rotor iron core, 3, permanent magnet slot; 4. rotor core, 5, stator core, 6, armature winding, 7, motor shaft, 8, stator mount, 9, casing, 10, permanent magnet.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

Fig. 1 shows a structural diagram of a stator and a rotor of an outer rotor doubly salient permanent magnet motor in stamping.

According to the embodiment, the stator and rotor iron cores are modularized to realize the effect of mutually nesting the stator and rotor iron cores, so that the waste of materials between stator poles is avoided, and the cost and the quality of the motor are reduced. Specifically, a rotor core of the outer rotor doubly salient permanent magnet motor is divided into 4 fan-shaped rotor modules (1), each rotor core module is provided with 2 rotor poles, a stator core is divided into 3 fan-shaped stator modules (2), each stator core is distributed with 2 stator poles, and a permanent magnet slot (3) is arranged at the center line of one stator core module;

two rectangular grooves are formed in the outer diameter of each fan-shaped stator core, the grooves are symmetrically distributed on the stator core, the depth of each rectangular groove is equal to the radial length of one rotor pole, and the width of each groove is equal to the width of one rotor pole;

the bottom of the stator core groove is arc-shaped, the top of the rotor pole is also arc-shaped, the radius of the arc is not smaller than that of the arc at the bottom of the groove, and the arc length of the arc does not exceed that of the arc at the bottom of the groove;

when the stator core and the rotor core are stamped, two rotor poles on the rotor core simultaneously extend into the rectangular grooves of the stator core respectively, and a rotor core stamped sheet and a stator core stamped sheet are obtained after stamping;

the outer diameter of the fan-shaped stator core module is arc-shaped, the circle center of the arc is determined according to the position during installation, and the circle center position of the arc is different from the circle center position of the stator core during stamping.

Fig. 2 is a structural diagram of a stator and a rotor of an outer rotor doubly salient permanent magnet motor of the invention which are installed into the motor.

The outer rotor doubly salient permanent magnet motor comprises a rotor iron core (4), a stator iron core (5), an armature winding (6), a motor shaft (7), a stator fixing frame (8), a machine shell (9) and a permanent magnet (10).

The modularized rotor iron cores (4) are 4 in number, the 4 rotor iron cores are uniformly distributed along the circumferential direction of the inner wall of the shell, each rotor iron core (4) is provided with two rotor poles protruding inwards, the two rotor poles are connected through a rotor yoke part, and the rotor iron cores (4) are in direct contact with each other to form the whole rotor iron core; the modularized stator iron cores (5) are 3 in total, the 3 stator iron cores are uniformly distributed on a stator fixing frame (8) along the circumference, 2 stator poles are uniformly distributed on the stator iron cores (5), the two stator poles are connected through a stator yoke part, all the stator iron cores are not directly contacted, and a space is reserved; after the stator iron core and the rotor iron core are installed, a disc-shaped stator and rotor structure is formed;

the rectangular permanent magnet (10) is fixed in a permanent magnet groove in the center of the stator core and is in contact with a yoke part of the magnetic conductive stator core; armature windings are arranged on the stator poles, and the permanent magnets provide excitation magnetic fields.

The outer rotor doubly salient permanent magnet motor adopts an outer rotor inner stator structure, the inner stator is fixed on the fixed frame and does not move, the rotor does circular motion outside the stator, a magnetic path is continuously generated, and a homodromous electromagnetic torque is generated; the stator and the rotor are modularized, so that when a certain pole of the stator and the rotor breaks down, other modules of the motor can normally operate.

Fig. 3 is a block diagram of a single rotor core module of an outer rotor doubly salient permanent magnet machine of the present invention.

Each rotor core is independently a module, two rotor poles are distributed on the rotor core, the top of each rotor pole is also in an arc shape, and the radius of the arc is not less than that of the arc at the bottom of the rectangular groove of the stator core; the outer diameter of the rotor core module does not exceed the inner diameter of the housing.

Fig. 4 is a block diagram of a single stator core module of an outer rotor doubly salient permanent magnet machine of the present invention.

Each stator core is independently a module, two stator poles are distributed on the stator core, the permanent magnet slots are arranged at the central line of one stator core module, and each stator core module is uniformly distributed on the stator fixing frame along the circumferential direction.

The outer diameter of the fan-shaped stator core module is arc-shaped, the circle center of the arc is determined according to the position during installation, and the circle center position of the arc is different from the circle center position of the stator core during stamping.