Soft decoding system of resolver

A technology of resolver and conversion module, applied in the field of sensors, can solve the problem of high cost and achieve the effect of saving cost, reducing circuit complexity and reducing cost

Active Publication Date: 2014-04-30
UNITED AUTOMOTIVE ELECTRONICS SYST
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AI Technical Summary

Problems solved by technology

In the application of the resolver, a decoding chip is often required to convert the output signal of the resolver into the angle

Method used

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Embodiment Construction

[0044] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] The resolver (Resolver) outputs the sin and cos differential signals with the excitation signal as the carrier. There is a slight unfixed phase difference between the actual output sin and cos signals and the excitation signal, such as figure 1 shown.

[0046] Input excitation signal: V r =V p sin(ωt),

[0047] Output differential signal: S3-S1=V S sin(ωt)sin(θ), S2-S4=V S sin(ωt)cos(θ),

[0048] When sin(ωt)=1, S3-S1, S2-S4 are sampled, then:

[0049] S 3 - ...

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Abstract

The invention discloses a soft decoding system of a resolver. The soft decoding system of the resolver comprises an angle interval judgment module, an angle calculation module, an angle compensation module, a frequency calculation module and an electrical angle and electrical frequency conversion module, wherein the angle interval judgment module is used for judging the angle interval where the angle at the DMA interruption moment is located according to sampling values of sin differential signals and sampling values of cos differential signals, the angle calculation module is used for calculating the angle at the DMA interruption moment according to the angle interval where the angle at the DMA interruption moment is located, the angle compensation module is used for carrying out compensation on the angle at the DMA moment to obtain the angle at the soft decoding interruption moment, the frequency calculation module is used for calculating the frequency of the resolver, and the electrical angle and electrical frequency conversion module is used for converting the current angle at the soft decoding interruption moment into the electrical angle of a motor, and converting the current frequency of the resolver into the electrical frequency of the motor. According to the soft decoding system of the resolver, a decoding chip is not needed, and the cost of a motor controller can be reduced.

Description

technical field [0001] The invention relates to a sensor for the position and rotational speed of a motor rotor, and in particular relates to a rotary transformer soft decoding system. Background technique [0002] Resolver (Resolver), as a common motor rotor position and speed sensor, has also been widely used in electric (pure electric, hybrid) vehicles. In the application of the resolver, a decoding chip is often required to convert the output signal of the resolver into the angle and frequency of the resolver, and then convert it into the electrical angle and frequency of the motor by software ,higher cost. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a rotary transformer soft decoding system, which does not require a decoding chip, can reduce the cost of the motor controller, reduce the complexity of the circuit, and has higher precision. [0004] In order to solve the above technical problems, the reso...

Claims

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Application Information

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IPC IPC(8): H02P6/16H01F38/18
Inventor 陈涵郑海涛
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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