Motor resolver detection and conditioning circuit and resolver initial position self-detection and self-updating method

Abstract

The invention discloses a motor resolver detection and conditioning circuit and a resolver initial position self-detection and self-updating method. The method comprises the steps that a motor controller enters a resolver position self-detection and self-updating mode according to a mode selection switching signal; the motor controller controls the alignment of magnetic electrodes, then reads out the absolute angle of an encoder at the moment through a rotary transformer, an encoder chip and a peripheral circuit, uses the absolute angle read out at the moment as the resolver initial angle of the motor, and writes into a software version; and the motor controller reads out the absolute angle of the encoder in real time through the rotary transformer, the encoder chip and the peripheral circuit, and calculates the electrical angle and electrical angle speed of the motor in real time according to the resolver initial angle of the motor in the software version. By adding the resolver position self-detection and self-updating mode, the invention can effectively reduce the resolver position adjustment link in the motor factory test under the premise of the same software version, and can automatically and accurate detect and update the resolver initial angle. The invention can be widely applied to the field of frequency control.

Description

technical field [0001] The invention relates to the field of frequency conversion and speed regulation, in particular to a motor resolver detection and conditioning circuit and a resolver initial position self-detection and self-renewal method. Background technique [0002] The current position of the motor operation is critical to the vector control of the motor system. Existing schemes obtain the current position of the motor through a motor position sensor or an estimation method, and calculate the motor speed in conjunction with the sampling (or estimation) period. First, the accuracy of existing estimation methods cannot match the accuracy of sensor calculations. Secondly, in the existing motor position sensor method, the initial angle position of the resolver has been calibrated in the software, and the accuracy can only be guaranteed by positioning and installing the resolver position. However, there is a difference between the actual resolver position and the calib...

AI Technical Summary

Problems solved by technology

However, this method assumes that the voltage amplitude and phase of the resolver and the resolver decoding chip are the same, and does not take into account the inconsistency of the voltage amplitude and phase of the two due to interference, noise and other factors, which reduces the motor rotation. The accuracy of position detection will change, and in severe cases, the resolver decoding chip will be damaged due to the excessive output voltage of the resolver

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