Permanent magnet synchronous motor resolver zero position calibration circuit

A permanent magnet synchronous motor, zero calibration technology, applied in motor control, electronic commutation motor control, electrical components and other directions, can solve the problem of inability to adapt to the influence of resolver angle deviation, inability to achieve real-time self-calibration learning, complex implementation, etc. problem, to achieve the effect of small footprint, prevention of zero position change of resolver, and low circuit cost

Inactive Publication Date: 2019-09-20
HEFEI JUYI POWER SYST CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0004] Compared with the present invention, the existing technical solution is relatively complicated to implement, and the cost is also high. It c...
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Abstract

The invention discloses a permanent magnet synchronous motor resolver zero position calibration circuit comprising three voltage dividing circuits for collecting three-phase output voltages Ua, Ub and Uc of a permanent magnet synchronous motor. The output ends of the three voltage dividing circuits are connected with the in-phase input ends of three comparators U1A, U1B and U5A. The inverting input ends of the three comparators are connected with a bus negative electrode. The comparator output voltages Ua' and Ub' through an exclusive OR gate and the comparator output voltage Uc' are exclusive OR again. The output voltages of the three comparators are connected with the NO pin of an alternative analog switch through a digital isolator after the exclusive OR logic output. The resolver sampling signal and the selection signal sent by the DSP are connected with the NC pin and the IN pin of the alternative analog switch. The COM pin of the alternative analog switch connects the output signal to the SAMPLE pin of a resolver decoding chip. Resolver zero position calibration can be quickly performed, the cost is low, the response is fast and the calibration accuracy is high, and the circuit can be directly transplanted to a PCB for real-time calibration and self-learning for the hybrid vehicle type.

Application Domain

Technology Topic

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  • Permanent magnet synchronous motor resolver zero position calibration circuit
  • Permanent magnet synchronous motor resolver zero position calibration circuit
  • Permanent magnet synchronous motor resolver zero position calibration circuit

Examples

  • Experimental program(1)

Example Embodiment

[0024] The principle of the present invention is to determine the current position of the rotor according to the size of the counter electromotive force, such as figure 1 As shown, when phase A descends to the zero point, the rotor is at the 0 degree position (the position of the D axis), when the B phase descends to the zero point, the rotor is at the position of 120 degrees, and when the C phase descends to the zero point, the rotor is at 240 degree position.
[0025] u a =-ωΨ f sin(ωt)
[0026] u b =-ωΨ f sin(ωt-2*π/3)
[0027] u c =-ωΨ f sin(ωt-4*π/3)
[0028] Utilizing the characteristics of AD2S1210 resolver decoding chip to update the position information at the falling edge of SAMPLE, the current rotor position is read through AD2S1210 resolver decoding chip when the counter electromotive force crosses zero, so as to obtain the resolver zero angle.
[0029] The specific implementation steps are as figure 2 Shown: First, a small torque is given to accelerate the motor forward to the rated speed, the PWM output is turned off, all the three-phase electromotive force zero-crossing points are collected, the waveforms are integrated into one waveform by an XOR gate, and the waveform is transmitted to the low-voltage side by a digital isolation chip. The SAMPLE signal of the resolver and the SAMPLE signal generated by the zero position calibration circuit of the resolver are selected by using an analog switch chip to select one of the two. When selecting the SAMPLE signal generated by the resolver zero calibration circuit, read the position signal fed back by the current resolver decoding chip to obtain the resolver zero value; when the motor decelerates to a stop state, choose one of the two analog switch chips to select the motor control The resolver SAMPLE signal given by DSP, a small torque is given to let the motor reversely accelerate to the rated speed, and then repeat the above operation, and calculate the average value of the resolver zero position obtained by forward rotation and reverse rotation.
[0030] like image 3 As shown, the permanent magnet synchronous motor resolver zero calibration circuit of the present invention, wherein Ua, Ub, and Uc are three-phase output voltages, and Ua voltage passes through resistors R3, R4, R5, R6, R7, R8, R9, R10, and R13 After the voltage is divided, it enters the non-inverting input terminal of the comparator U1A, the inverting input terminal of U1A is directly connected to the bus negative, the output voltage of the U1A comparator is Ua'; the Ub voltage passes through the resistors R18, R19, R20, R21, R22, R23, R24, After divided by R25 and R28, it enters the non-inverting input terminal of comparator U1B, and the inverting input terminal of U1B is directly connected to the bus negative, and the output voltage of U1B comparator is Ub'; the Uc voltage passes through resistors R34, R35, R36, R37, R38, R39 , R40, R41, R43 divide the voltage and enter the non-inverting input terminal of comparator U5A, the inverting input terminal of U5A is directly connected to the bus negative, and the output voltage of U5A comparator is Uc'.
[0031] In the figure, U2 is an XOR gate. Ua' enters pin 1 of the XOR gate through resistor R11, and Ub' enters pin 2 of the XOR gate through resistor R14. After completing the XOR logic, Ua' and Ub' output from pin 2 and enter pin 4. Pin, Uc' enters pin 5 through resistor R15, and finally Ua', Ub', Uc' are XORed and output from pin 6 through resistor R26 to pin 3 of the digital isolator, and the digital isolator finally outputs Uabc from pin 6 'signal; U4 is an analog switch that chooses one of two, the resolver sampling signal SAMPLE_RESOLVER_DSP sent by DSP enters pin 3 of U4 through resistor R29, Uabc' enters pin 1 of U4 through resistor R30, and the U4 selection signal SAMPLE_SELECT_DSP sent by DSP enters pin 6 of U4 Pin 4 is the selected output signal SAMPLE_RESOLVER entering the SAMPLE pin of the resolver decoding chip.
[0032] When the U4 selection signal SAMPLE_SELECT_DSP is low level, the resolver decoding chip SAMPLE signal comes from the DSP, and it is in the normal motor control mode at this time, and normal motor control can be performed;
[0033] When the motor is running until the drive signal is disconnected, you can choose to set the U4 selection signal SAMPLE_SELECT_DSP to high level. The SAMPLE signal of the resolver decoding chip comes from the hardware zero position calibration circuit. At this time, the resolver zero position can be measured, but the motor control cannot be performed. .
[0034] The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical solutions of the present invention shall fall within the protection scope of the present invention.
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Owner:HUAWEI TECH CO LTD
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