Non-location technology for three-phase electro-magnetic double-salient pole machine starting and accelerating based on induction method

Abstract

The invention discloses a non-location sensor technology for three-phase electro-magnetic double-salient pole machine starting and low-speed accelerating processes. According to the characteristics of an electro-magnetic double-salient pole machine, exciting current is not applied in a static state, but fixed-cycle low voltage pulse signal judging phase current is applied on armature windings, double-phase series connection self inductance is then calculated, and a rotor position is estimated. During a low-speed accelerating process, the mutual inductance sum of two phases of series connection windings and an excitation winding is calculated according to the armature current gradient when chopped waves are acquired in real time, so that the non-location low-speed accelerating technology for accelerating a motor is carried out. By utilizing the method, the initial rotor position can be accurately positioned, a rotor sector can be identified and fed back in real time during the low-speed accelerating, the maximum inductance is obtained through comparison, and the phase shifting time is determined after time delay. Consequently, the rotor positions can be fed back during the whole starting and accelerating processes, so that the motor cannot be out of step during the starting process and has strong antijamming capability. By utilizing the technology, the three-phase electro-magnetic double-salient pole machine can be enabled to start and accelerate stably and reliably.

Description

technical field [0001] The invention relates to a position sensorless control method for starting acceleration of a three-phase electric excitation double salient pole motor based on inductance, which belongs to the motor control technology. Background technique [0002] With the development of power electronics technology and digital control technology, accurate detection of rotor position has become a research hotspot in the field of motor control. The electric excitation double salient pole motor has the characteristics of no winding on the rotor, simple structure, flexible control, large torque / current ratio, and can realize the integration of starting and power generation. In order to achieve reliable start and stable operation of electrically excited double salient pole motors, and to enable the motors to operate reliably in special environments (high temperature, high pressure, low temperature, humidity, corrosion and vibration, etc.), especially in the field of start...

AI Technical Summary

Problems solved by technology

For traditional motors, the starting process usually adopts the traditional "three-stage" starting process, that is, positioning, boosting frequency and boosting starting, and switching. Since the rotor position cannot be accurately fed back during the starting process, the motor is vulnerable to the applied voltage and load during the starting process. Influenced by factors such as torque, out of step

The improved starting technology is to continuously alternately apply the acceleration voltage vector and the detection voltage vector during the starting process, but this will cause the motor to have a large torque ripple during the commutation process, and it needs to continuously increase the voltage during starting, which also increases Complexity of motor starting process control

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