Rotating transformer digital converter capable of on-line failure detection and fault-tolerant control

Abstract

The invention discloses a rotating transformer digital converter capable of on-line failure detection and fault-tolerant control. According to the method, an electric automobile PMSM is used for controlling matched utilization of a microprocessor DSP and the rotating transformer so as to achieve a PMSM rotor position of a drive system of the PMSM. Failures of the rotor position of the drive system of the PMSM can be detected real-timely. Meanwhile, a kalman filter is adopted for identifying errors of the rotor position, and realizing self-adaptive fault-tolerant control, and therefore precision of acquiring the rotor position is improved.

Description

technical field [0001] The invention relates to a rotary transformer digital converter, more specifically, a rotary transformer digital converter with functions of online fault detection and fault-tolerant control applied in a permanent magnet synchronous motor (PMSM) driving system of an electric vehicle. Background technique [0002] The resolver has been widely used in the field of electric vehicles due to its advantages of stability, high efficiency, and strong environmental adaptability. The output signal of the resolver is an analog quantity of position information, and a decoding chip is needed to accurately obtain the digital value of the rotor position information of the permanent magnet synchronous motor. quantity. However, the output signal of the resolver may have faults such as amplitude imbalance, incomplete quadrature, signal offset, and induced harmonics, so that the position information obtained by the resolver-to-digital converter is not the actual rotor po...

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Problems solved by technology

However, the output signal of the resolver may have faults such as amplitude imbalance, incomplete quadrature, signal offset, and induced harmonics, so that the position information obtained by the resolver-to-digital converter is not the actual rotor position, resulting in errors and affecting the motor. Dynamic and Static Performance of Automotive PMSM Drive System

In the prior art, although the recursive least squares method can be used to realize parameter identification online and adaptively compensate the position error output by the resolver, it is sensitive to the selection of the initial value of the parameters and is easily disturbed by external noise; in addition, the fault-tolerant The control scheme needs to use the dedicated chip of the resolver digital converter to obtain the rotor position, which leads to an increase in system cost and complex design

[0003] In the prior art, the DSP chip in the permanent magnet synchronous motor controller is also used to generate the excitation signal of the resolver and the analog signal output by the resolver is obtained through the arc tangent look-up table to obtain the rotor position, although it can effectively reduce the hardware cost and avoid time Delay phenomenon, but this solution does not have the fault detection and fault-tolerant control capabilities of the resolver, and cannot ensure the accuracy of the rotor position and speed acquisition; in addition, the arctangent look-up table method takes up a lot of storage resources and slows down the calculation speed

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