High-speed driving motor resolver angular displacement measurement error test method

Abstract

The invention provides a high-speed driving motor resolver angular displacement measurement error test method, which comprises the following steps: an initial step: detecting the rotating speed of a motor rotor through a resolver, and driving a motor to enable the motor rotor to rotate at a set test speed; a power-off step: carrying out power-off operation on the motor, so that a motor rotor is gradually decelerated without external force; a sampling and storing step: performing high-frequency equal-time-interval sampling and storing on the output signal of the rotor of the resolver; and an analysis and calculation step: analyzing the stored output signal to obtain a measurement result of the angular displacement of the resolver within a set angle, and calculating and comparing the measurement result with an actual result of the angular displacement of the rotor of the resolver to obtain an angular displacement error. According to the test method provided by the invention, a benchmark reference angular displacement encoder does not need to be configured and installed, the installation problem of the high-speed and high-precision reference angular displacement encoder can be avoided, and interference of resonance points can be avoided.

Description

technical field [0001] The invention relates to the field of high-speed drive motors, in particular to a method for testing errors in angular displacement measurement of high-speed drive motors. More specifically, it relates to a test method applied to the angular displacement measurement error of a resolver for a high-speed drive motor of an electric vehicle. Background technique [0002] High-speed driving motor (20,000rpm-30,000rpm) is one of the key technologies to realize high-density, light-weight and miniaturized powertrain of new energy vehicles, and has become the development direction of new energy vehicle driving motors. As the core component of drive motor system control, the resolver must meet the requirements of angular displacement measurement accuracy and dynamic response quality under high-speed rotating conditions. [0003] Conventional resolver angular displacement measurement error test platform requires a high-precision position sensor to provide a refe...

AI Technical Summary

Problems solved by technology

[0010]1. The accuracy and resolution of the reference angular displacement encoder depends on many factors, one of which is the structure principle and measurement method of the reference angular displacement encoder itself. The second is the installation error, and the third is the adaptability to high-speed operation. Therefore, the scheme of using the reference angular displacement encoder for benchmarking has very high requirements for the installation of the reference angular displacement encoder, which is difficult to achieve in practice.

[0011]2. During high-speed operation, due to the factors of the reference angular displacement encoder and its measurement method, the high-precision performance of high-speed operation is limited, and at the same time, it is difficult to meet high-speed operation high-precision installation requirements

Therefore, under high-speed operation, it is difficult to accurately measure the position and angular displacement errors of the rotary encoder under test.

[0012]3. Another challenge of high-speed operation is to overcome the influence of resonance; that is, when the high-speed encoder gradually increases from low speed to high speed, it often passes through multiple Resonance points will affect the measurement results

[0013] Therefore, under high-speed operating conditions, it is difficult to provide the position and angular displacement signals of the rotary transformer through the existing reference angular displacement encoder

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