Four-quadrant position-sensorless control method for four-phase switch reluctance motor

Abstract

The invention discloses a four-quadrant position-sensorless control method for a four-phase switch reluctance motor, and belongs to the technical field of motor drive. The four-quadrant position-sensorless control method is characterized in that each phase of flux linkage for the switch reluctance motor is actually measured by using a test circuit, rotor positions are determined by using six flux linkage-current characteristic curves at special rotor positions, namely a flux linkage-current characteristic curve psi theta r / 8 at a theta r / 8 rotor position, a flux linkage-current characteristic curve psi theta r / 4 at a theta r / 4 rotor position, a flux linkage-current characteristic curve psi theta r3 / 8 at a 3 theta r / 8 rotor position, a flux linkage-current characteristic curve psi theta r5 / 8 at a 5 theta r / 8 rotor position, a flux linkage-current characteristic curve psi theta r3 / 4 at a 3 theta r / 4 rotor position, and a flux linkage-current characteristic curve psi theta r / 78 at a 7 theta r / 8 rotor position, the phases are switched on and off in sequence, positive and negative starting, low-speed positive electric motion and braking running, low-speed negative electric motion and braking running, medium-high speed positive electric motion and braking running, medium-high speed negative electric motion and braking running are carried out, rotor-position sensors are not needed, and four-quadrant control for the four-phase switch reluctance motor is realized, so that the method has high engineering application value.

Description

technical field [0001] The invention relates to a four-quadrant position sensorless control method for a four-phase switched reluctance motor, in particular to a four-quadrant position sensorless control method for a four-phase switched reluctance motor suitable for various structures. Background technique [0002] The switched reluctance motor is a self-synchronous motor, and it is necessary to obtain rotor position information to determine the off-phase and on-phase of the motor, so that the motor can run continuously. The installation of the position sensor increases the volume and cost of the system, and at the same time reduces the reliability of the switched reluctance motor, so it is necessary to realize the position sensorless control of the switched reluctance motor. The existing position sensorless control methods of switched reluctance motors mainly include: 1. Current waveform method, but only limited to the current chopping control method, which is not suitable ...

AI Technical Summary

Problems solved by technology

The existing position sensorless control methods of switched reluctance motors mainly include: 1. Current waveform method, but only limited to the current chopping control method, which is not suitable for high-speed use and cannot detect the initial position of the rotor; 2. Pulse injection method, which is not suitable Run at high speed; 3. Modulation and demodulation method, increase the modulation and demodulation circuit, the circuit adds complexity to the connection and separation of windings; it is not suitable for high-speed operation; 4. Mutual inductance method, for the conduction phase The control method is limited, it is only suitable for low-speed operation, the electromagnetic characteristics need to be stored, and the anti-interference is poor; 5. The current gradient method is suitable for medium and high speeds, and it cannot realize self-starting; 6. The flux linkage method needs to establish an accurate model of the motor and store it. 7. The inductance method, the detection accuracy depends on the static model of the motor, and the calculation amount is large; 8. The observer method requires a high-precision motor model and load model, and has high requirements for the processor; At present, there is no position sensorless control method for switched reluctance motors suitable for the full speed range. Therefore, it is necessary to propose a method that does not need to increase external hardware and storage space, has self-starting and four-quadrant operation capabilities, and has a wide speed range. Calculation Sensorless control method for small four-phase switched reluctance motor

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