Electrically-excited double-salient-pole motor no-position speed-up method

Abstract

The invention discloses an electrically-excited double-salient-pole motor no-position speed-up method. The method comprises the steps: judging a section where a rotor is initially located according to the size relation of voltages of three-phase ends in a rising process of an exciting current when a motor is stationary; continuously transmitting a speed-up pulse and a detection pulse into an armature winding, and achieving the no-position speeding up of the motor. Compared with the prior art, the method does not need to transmit a detection current into the armature winding during initial position detection, and avoids the jittering and reverse rotation of the motor. Can the section where the rotor is located be judged only if one detection pulse needs to be injected in a speed-up process, thereby greatly shortening the detection time. Moreover, negative electromagnetic torque cannot be generated when the detection pulse does not reach a phase switching point, thereby facilitating the stable speeding up of the motor. In addition, the method does not need to add a hardware circuit, is not affected by the parameters of the motor, is good in transportability, and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a positionless speed-up method for an electrically excited double salient pole motor. Background technique [0002] The electrically excited doubly salient motor has the advantages of simple structure, flexible control and good fault-tolerant performance, which has attracted extensive attention of many scholars. Its stable operation requires accurate position information. The installation of mechanical position sensors in traditional systems increases the size and cost of the system and reduces reliability. Therefore, the position sensorless control technology of electrically excited double salient pole motor has important research significance. At present, the research on position sensorless control technology of electrically excited double salient pole motor is still in its infancy at home and abroad. [0003] Zhang Haibo et al. disclosed a method for identifying the rot...

AI Technical Summary

Problems solved by technology

This method requires high-frequency sampling of the bus current value according to the current switching state, which is difficult to implement, and the commutation threshold for setting the inductance slope is related to the motor parameters, which limits its application range

[0005] Based on the current method of low-speed and positionless operation of electrically-excited double-salient pole motors, there are problems that multiple detection pulses need to be injected, the implementation process is complicated, motor parameters need to be obtained, and the sampling requirements are high. The patent of the present invention proposes a method that only needs to inject one The method of non-position speed-up by detecting the pulse and judging the position of the rotor

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