Switched reluctance motor for capacitor split circuit

Abstract

The invention provides a split-capacity switched reluctance motor, which belongs to the technical field of motors. The invention solves the problem that the operation of the switched reluctance motor is hindered by the A phase and the C phase of the conventional switched reluctance motor for capacity splitting due to long freewheeling time, resulting in relatively low efficiency of the whole system. The switched reluctance motor for capacitor split type includes a stator and a rotor. The outer ring surface of the stator has stator grooves and stator salient poles that are evenly spaced, and the inner ring surface of the rotor has rotor grooves and rotor salient poles that are evenly spaced. The difference between the radian of the groove and the radian of the salient pole of the stator is smaller than the difference between the radian of the salient pole of the rotor and the radian of the groove of the stator. The switched reluctance motor can reduce the natural freewheeling time of phase A and phase C, improve the efficiency of the switched reluctance motor, and save energy.

Description

technical field [0001] The invention belongs to the technical field of motors, and relates to a switched reluctance motor, in particular to a switched reluctance motor for a capacitor split circuit. Background technique [0002] The switched reluctance motor has the advantages of simple structure, no motor winding on the rotor core, no permanent magnet, strong fault tolerance, high reliability, large starting torque, etc., and its application range is expanding day by day. The main circuit of the switched reluctance power converter includes an asymmetrical half-bridge conversion circuit, a double-winding power conversion circuit, a capacitor conversion circuit with storage, a regenerative conversion circuit, and a capacitor split conversion circuit. Among them, the capacitive split conversion circuit has the advantages of high winding utilization efficiency and fewer power devices, and thus is widely used. This patent takes the 8 / 6 type 4-phase switched reluctance motor as ...

AI Technical Summary

Problems solved by technology

After the two-phase AB is energized, switch to the BC two-phase energization, and the A phase still conducts natural freewheeling through the freewheeling tube D1. However, no back pressure is applied to the A-phase coil, and the freewheeling time is long. Moreover, during the start-up process, A The angle of the phase current increase process is much larger than the phase A current decrease area, so it is easy to freewheel to the negative torque area, such as figure 2 As shown, the negative torque zone is between the angle θ3 to θ4

When phase A is running in the negative torque region, it hinders the operation of the switched reluctance motor, so the efficiency of the entire system is relatively low

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