Permanent magnet synchronous motor back electromotive force balance adjusting device and method

Abstract

The invention discloses a permanent magnet synchronous motor back electromotive force balance adjusting device which comprises a three-phase inverter circuit, the input end of the three-phase invertercircuit being connected with a direct-current power supply, and the output end of the three-phase inverter circuit being connected to a three-phase stator winding of a permanent magnet synchronous motor; an absorption circuit, connected between the common connection ends of every two phases of stator windings, and a switch being arranged between the common connection ends of every two phases of stator windings; energy storage capacitors C1, connected to the two ends of the absorption circuit, the three energy storage capacitors being connected in series through a switch, the positive electrodes of the three series energy storage capacitors being connected with the positive electrode end of a direct-current power supply, and the negative electrodes of the three series energy storage capacitors being connected with the negative electrode end of the direct-current power supply. The absorption circuit is connected between every two motor stator windings to absorb the back electromotive force generated on the turn-off phase windings on site, balance the neutral point voltage of the three-phase stator windings and reduce the impact of the back electromotive force on an inverter circuit.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a counter electromotive force balancing device and method for a permanent magnet synchronous motor. Background technique [0002] In the prior art, when the motor is controlled, the inverter bridge arm needs to be continuously turned on alternately, resulting in back electromotive force on the off phase, resulting in neutral imbalance of the stator winding of the motor, which interferes with the control and operation of the motor; at the same time , In the prior art, the starting speed of the motor is slow, and it is easy to cause the motor to run out of step, which is not conducive to the precise control of the motor. Contents of the invention [0003] It is an object of the present invention to solve at least the above-mentioned problems and to provide at least the advantages which will be described later. [0004] Still another object of the present invention is to pr...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, when controlling the motor, the inverter bridge arm needs to be continuously conducted alternately, resulting in back electromotive force on the off-phase, resulting in neutral imbalance of the motor stator winding, and causing interference to the motor control and operation; at the same time , in the prior art, the starting speed of the motor is slow, and it is easy to cause the motor to run out of step, which is not conducive to the precise control of the motor

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