Precision detection system for rotary transformer

Abstract

The invention discloses a precision detection system for a rotary transformer, which comprises the rotary transformer and a photoelectric rotary encoder, a decoder, a synchronization control circuit and an upper computer, wherein the rotary transformer and the photoelectric rotary encoder are arranged on a motor shaft, the decoder is used for outputting an excitation signal to the rotary transformer and receiving a modulation signal with rotary angle information of the rotary transformer and figuring out a rotary angle; the synchronization control circuit is used for ensuring that the rotary transformer and the photoelectric rotary encoder obtain the rotary angle at the same moment; and the upper computer is used for estimating the measurement precision of a position detection system based on the rotary transformer. According to the precision detection system for the rotary transformer, provided by the invention, measurement precision of the position detection system based on the rotary transformer when the motor is in fixed rotation speed, acceleration and deceleration processes can be more accurately estimated, defects in the design are favorably found and the design is improved. Meanwhile, the precision detection system has smaller volume and low cost as well as little influence on a device to be detected, and can be used for objectively estimating the measurement precision of the device to be detected.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to a sensor precision detection system. Background technique [0002] The position and speed sensors in new energy vehicles (such as hybrid vehicles, electric vehicles, etc.) used to mostly use photoelectric rotary encoders, but in recent years they have been rapidly replaced by resolvers. This is because although the rotary encoder has a high resolution, it is easy to be damaged by vibration and the maintenance frequency is high; while the resolver can withstand high-intensity vibration, is not afraid of dust and oil, has a long service life, and has a low failure rate. [0003] see figure 1 , which is a resolver based position detection system. Under the control of MCU (microcontroller) 10, a pair of output ends of decoder (Decoder) 11 produces a high-frequency excitation signal, as figure 2 shown. The excitation signal first passes through an excitation buffer (Excitati...

AI Technical Summary

Problems solved by technology

[0007] First, the motor test bench can only measure the accuracy of the position detection system at a fixed speed of the controlled motor, but cannot measure the accuracy when the speed of the controlled motor changes (acceleration or deceleration)

[0008] Second, the background noise of the motor test bench is relatively large, which has a certain impact on the accuracy of the detection

[0009] Third, the construction and maintenance costs of the motor test bench are relatively high

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