Electro-magnetic doubly salient motor rotor position identification method based on three-phase six-state start

Abstract

The invention discloses a novel rotor initial position detecting technique which is used when a three-phase electro-magnetic doubly salient motor is started in six states. Because the research of a sensorless technique of the electro-magnetic doubly salient motor is very little at home and abroad, the invention provides a rotor position prediction method based on two-two conducted and injected low-pressure pulse vectors by aiming at the unique characteristic of the three-phase electro-magnetic doubly salient motor that an armature inductance value is a function of the rotor position. According to the method, only the terminal voltage of a non-conducted phase is detected, and the rotor initial position can be precisely predicted by comparing response amplitudes of the terminal voltage of the non-conducted phase on a conduction stage and a flow-continued stage. According to the method, any additional component is not needed, and an armature current sampling transformer is omitted; the method has the advantages of economy and practicability; and additionally, the positioning accuracy can reach 60 DEG, and the three-phase electro-magnetic doubly salient motor is guaranteed to be started in the six states, so as to increase the starting torque of the motor.

Description

technical field [0001] The invention discloses a novel rotor initial position detection technology used for three-phase electric excitation double salient pole motor starting in six states, which belongs to the electric drive system control technology. Background technique [0002] With the development of power electronics technology and digital control technology, and the three-phase electric excitation double salient pole motor has no winding on the rotor, the structure is simple, the control is flexible, the power density is high, the field can be demagnetized by failure, and the integration of starting and power generation can be realized. And the armature inductance is the characteristic of the rotor position function, which makes the three-phase electrically excited doubly salient pole motor become a research hotspot. For a motor with high use value, obtaining the rotor position accurately in real time to ensure its reliable start and stable operation has become a prer...

AI Technical Summary

Problems solved by technology

However, the research on the non-position detection technology of double salient pole motors is in the initial research stage. The method of pre-positioning the initial rotor position proposed by previous scholars is to locate the initial position of the rotor to the preset position sector, and use the frequency-boosting " "Three-stage" starting technology, on the one hand, this method is likely to cause the rotor to reverse when the initial position of the motor is positioned, and at the same time, it is easy to cause the motor to start out of step

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