Fault-tolerant type four-phase switch reluctance motor used for driving of electric automobile

Abstract

The invention discloses a fault-tolerant type four-phase switch reluctance motor used for driving of an electric automobile. A stator is composed of a stator yoke and stator teeth. The stator teeth are formed by eight wide teeth and eight narrow teeth which are distributed along the circumferential direction of the internal circle of the stator yoke in a mutually alternating way. A rotor is composed of rotor iron core blocks and a rotor sleeve. There are ten rotor iron core blocks which are evenly distributed along the circumferential direction of the external circle of the rotor sleeve and fixedly embedded in the rotor sleeve so that the cylindrical rotor is formed by the rotor iron core blocks and the rotor sleeve together. One stator winding is wound on the eight wide teeth in a concentrated way, and winding directions on the adjacent wide teeth are identical so that NNNNSSSS polar distribution is formed, and the windings on the two opposite wide teeth are forwardly connected in series into a phase. Torque output capability is enhanced under the situation that the motor is not aligned in position. The separated rotor iron core blocks are adopted to embedded in the non-magnetic-conductive rotor sleeve so that the magnetic circuit is shorter, magnetic leakage is reduced and wind resistance is low. The narrow teeth with no winding can be used as the loop of magnetic flux to realize a shorter magnetic circuit and can also be used for isolation.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing and application, and relates to a switched reluctance motor for electric vehicles. Background technique [0002] With the aggravation of energy crisis, environmental pollution and other issues, electric vehicles with outstanding advantages such as high efficiency, low pollution, low noise and wide source of power have attracted attention. Switched reluctance motor has become one of the most optimal solutions for electric vehicle drive systems due to its advantages of high efficiency, low cost, simple structure, reliable operation, and wide speed range. [0003] In the traditional switched reluctance motor, both the stator and the rotor have a double-salient pole structure, which makes the torque ripple and vibration noise relatively large during operation, and the double-salient pole structure of the stator and rotor makes the rotor wind resistance large during high-speed operation. T...

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Problems solved by technology

Although the motor has the advantages of simple structure, it also has the following disadvantages: ① Since the ratio of the tooth width of the stator teeth to the rotor pole pitch cannot be enlarged a lot (if the ratio is large, then the self-inductance is the lowest when the axes between the stator poles and the rotor poles are aligned. hours, it will increase the minimum inductance), so that the output torque capacity is low, which is not conducive to the low-speed start-up operation of electric vehicles; ②During high-speed operation, the double salient pole structure of the stator and rotor makes the wind resistance of the rotor large; ③If figure 2 The magnetic circuit diagram of a certain phase of the traditional three-phase switched reluctance motor shown in Fig. figure 2 It can be seen that the magnetic circuit is a quadrupole type, and a longer magnetic circuit will lead to an increase in core loss, thereby reducing the efficiency of the motor; ④ in figure 2 Among them, when a certain phase winding is excited, not only a four-pole main magnetic circuit is generated, but also a magnetic flux leakage phenomenon occurs, so that when the three phases are energized sequentially, the coupling effect between the magnetic circuits between adjacent teeth cannot be ignored , which affects the fault-tolerant performance of the motor

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