Evaluation and suppression method for electromagnetic interference noise of rotary transformer

Abstract

The invention discloses an evaluation and suppression method for electromagnetic interference noise of a rotary transformer, and the method achieves the accurate evaluation of the coupling electromagnetic noise of a rotary transformer system in a mode of combining testing with circuit modeling. The filter inductor of the rotary transformer circuit is quantitatively designed based on the evaluationmodel, so that the quality of input and output signals of the rotary transformer is improved. Compared with a traditional resolver noise suppression method, the electromagnetic interference couplingmodel of the motor driving system and the rotary transformer system is established, the electromagnetic interference noise coupled by the rotary transformer system can be quickly evaluated in the design stage of the new energy automobile, a noise suppression scheme can be quantitatively designed based on the model, and the design cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy automobile motor control, and in particular relates to a method for evaluating and suppressing electromagnetic interference noise of a resolver. Background technique [0002] In the new energy vehicle motor drive system, the rotor position of the motor is a key variable for torque control and speed regulation. If the rotor position signal is disturbed, the vehicle may experience risks such as unstable speed and torque loss control. Due to the advantages of high stability, strong shock resistance, and high temperature resistance, the resolver has been widely used in the detection of the rotor position of the new energy vehicle motor; the input signal of the resolver is a sinusoidal voltage signal, and the output signal is an orthogonal sine and cosine voltage The two output signals are decoded by the chip to obtain the absolute position and speed information of the motor rotor. [0003] Circuit...

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Problems solved by technology

[0006] The Chinese utility model patent with the publication number CN202663366U proposes a filter device for a resolver. An EMI filter is connected to the input and output signal lines of the resolver. The filter includes a common-mode inductor and a filter capacitor to improve the resolution of the resolver. The anti-interference ability of the output signal of the transformer; however, this patented technology only shows that the EMI filter can improve the signal quality of the resolver, but it does not clarify how the EMI in the resolver circuit is generated and how the parameters of the EMI filter should be designed

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