Method and System for Acquiring Rotor Position of Rotary Transformer
First Claim
1. A system for acquiring a rotor position of a rotary transformer, comprising:
- a rotary transformer decoder, a low pass filter and a microprocessor, whereinthe microprocessor comprises a synchronous demodulation module and a calculation module,the rotary transformer decoder is electrically connected to the rotary transformer through the low pass filter, and is configured to output an excitation signal to drive the rotary transformer and acquire first position information of the motor rotor, the first position information comprising at least a first rotor position and a first rotor speed,the synchronous demodulation module is electrically connected to the rotary transformer decoder and the rotary transformer, and is configured to collect at least a rotary transformer cosine signal and a rotary transformer sinusoidal signal outputted from the rotary transformer and output a feedback signal, the feedback signal comprising at least a target rotary transformer sinusoidal signal and a target rotary transformer cosine signal,the calculation module is connected to the synchronous demodulation module, and is configured to perform calculation to acquire second position information of the motor rotor based on the feedback signal and according to a preset algorithm, the second position information comprising at least a second rotor position and a second rotor speed.
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Abstract
A method and a system for acquiring a rotor position of a rotary transformer are provided. The system includes: a rotary transformer decoder, a low pass filter and a microprocessor, which includes a synchronous demodulation module and a calculation module. The rotary transformer decoder outputs an excitation signal and acquires first position information of the motor rotor. The calculation module performs calculation to acquire second position information of the motor rotor. The rotary transformer decoder and software decoding are integrated to acquire two rotor positions, and the two rotor positions are compared. In a case that a preset determining condition is met, one of the rotor positions is used for motor control, and the other is used as redundant data for backup, thereby improving the reliability of the acquired rotor position.
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18 Claims
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1. A system for acquiring a rotor position of a rotary transformer, comprising:
- a rotary transformer decoder, a low pass filter and a microprocessor, wherein
the microprocessor comprises a synchronous demodulation module and a calculation module, the rotary transformer decoder is electrically connected to the rotary transformer through the low pass filter, and is configured to output an excitation signal to drive the rotary transformer and acquire first position information of the motor rotor, the first position information comprising at least a first rotor position and a first rotor speed, the synchronous demodulation module is electrically connected to the rotary transformer decoder and the rotary transformer, and is configured to collect at least a rotary transformer cosine signal and a rotary transformer sinusoidal signal outputted from the rotary transformer and output a feedback signal, the feedback signal comprising at least a target rotary transformer sinusoidal signal and a target rotary transformer cosine signal, the calculation module is connected to the synchronous demodulation module, and is configured to perform calculation to acquire second position information of the motor rotor based on the feedback signal and according to a preset algorithm, the second position information comprising at least a second rotor position and a second rotor speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a rotary transformer decoder, a low pass filter and a microprocessor, wherein
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10. A method for acquiring a rotor position of a rotary transformer, comprising:
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outputting an excitation signal to drive the rotary transformer, acquiring first position information of the motor rotor, the first position information comprising at least a first rotor position and a first rotor speed, acquiring at least a rotary transformer cosine signal and a rotary transformer sinusoidal signal outputted from the rotary transformer and outputting a feedback signal, the feedback signal comprising at least a target rotary transformer sinusoidal signal and a target rotary transformer cosine signal, and performing calculation to acquire second position information of the motor rotor, based on the feedback signal and according to a preset algorithm, the second position information comprising at least a second rotor position and a second rotor speed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification