Vehicle permanent magnet synchronous motor rotary transformer zero calibration method and system

Abstract

The invention provides a vehicle permanent magnet synchronous motor rotary transformer zero calibration method and system. The zero calibration method comprises the following steps of controlling a permanent magnet synchronous motor to operate according to the received given current vector amplitude and the given rotating speed value; after the permanent magnet synchronous motor stably operates atthe given rotating speed value, setting the inverter in a three-phase short circuit state, and recording a first included angle and a second included angle formed by a current vector at a specific rotation speed value and a d-axis negative half axis of a preset rotor coordinate system of the permanent magnet synchronous motor in the subsequent rotation speed reduction process, then calculating the average value of the first included angle and the second included angle, and obtaining the zero offset angle of the rotary transformer. The method has the beneficial effects that the rotation speedclosed-loop measurement is realized, the influences of the friction force, the cogging torque or other non-ideal factors to the zero calibration of the rotary transformer can be eliminated or suppressed, the measurement precision is high, and the calibration can be carried out under the condition that the calibrated motor is in a vehicle-mounted state.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a zero calibration method and system for a rotary transformer of a vehicle-mounted permanent magnet synchronous motor. Background technique [0002] The control of the permanent magnet synchronous motor in electric vehicles is inseparable from the rotor position signal, and the accuracy of the rotor position signal has an important impact on the driving performance of the motor. At present, resolvers are widely used as position detection devices. The resolver stator is installed on the stator side of the motor, and the rotor is fixed on the motor rotor and rotates coaxially, and is integrated with the motor. [0003] When the controller controls the operation of the permanent magnet synchronous motor, it needs to know the rotation angle of the motor rotor relative to the motor stator, that is, figure 1 middle But resolver readings is the reading of the resolver rotor re...

AI Technical Summary

Problems solved by technology

The problem with this method is that it does not consider the frictional force, cogging torque and other influencing factors when the motor rotates, and the measurement accuracy is not accurate enough.

[0010] In the above scheme, either the rotation of the motor needs to be dragged by other equipment, and additional measuring equipment needs to be added at the same time, which is not convenient for on-board measurement, or the motor is in a relatively static test without continuous rotation, and the influence of ideal factors such as friction cannot be eliminated, and the measurement accuracy is not accurate enough

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