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A topology and method for mutual correction of dual motor current sensors

A current sensor and mutual correction technology, applied in the current controller, motor parameter estimation/correction, motor control and other directions, can solve problems such as increased cost and sampling point limitation, achieve cost saving, fast correction speed, easy data The effect of sampling

Active Publication Date: 2022-07-29
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

However, this method must use the bus current sensor to realize the correction of the phase current sensors of the two motor subsystems, which increases the cost
At the same time, this method requires the carrier waves of the two motors to be in quadrature during calibration, and the sampling points for calibration are limited.

Method used

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  • A topology and method for mutual correction of dual motor current sensors
  • A topology and method for mutual correction of dual motor current sensors
  • A topology and method for mutual correction of dual motor current sensors

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Embodiment Construction

[0049] Simulate the situation where the current sensor produces errors, introducing errors to the six current sensors: f A1 =0.1, f B1 =0.2, f C1 =-0.1, f A2 =-0.05, f B2 =0.1, f C2 =-0.2, k A1 =1.2, k B1 =0.9, k C1 =1.1, k A2 =1.05, k B2 =1.15, k C2 = 0.9. At this point, the system is calibrated, and the specific steps are as follows:

[0050] Step 1: Follow as figure 1 According to the topology wiring, sampling is performed at the initial stage of the control cycle of the five-segment SVPWM control algorithm, and the feedback results of each phase current of the dual-motor subsystem are calculated in combination with formula (1). The results are fed back to form a closed loop to control the operation of the motor.

[0051] Step 2: Generate figure 2 For the PWM correction signal shown, the position of the sampling point of the feedback current in this period does not change, and the feedback current can be obtained by formula (2). The five-stage SVPWM control ...

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Abstract

The invention belongs to the technical field of motor control, and relates to a topology and a method for realizing current sensor correction in a dual motor drive system. In this topology, the three-phase winding cables of each motor respectively pass through the signal detection ports of the current sensors in the forward direction, and at the same time, the general bus connecting the dual-motor system and the positive pole of the power supply passes through the signal detection ports of all current sensors in the forward direction. The current sensor calibration process is as follows: calculate the current feedback value when the motor is normally driven; generate the PWM waveform of the calibration period and calculate the feedback current during calibration; acquire and process the sampled data; solve the bias error; solve the scaling error correction coefficient; compensate the current sensor . The invention changes the topological structure of the dual-motor system, thereby saving a busbar current sensor, saving costs, and realizing the elimination of the bias error of each sensor and the balance of the scaling error; the correction method is simple to operate, and the correction accuracy can be improved according to requirements. .

Description

[0001] Technical field [0002] The invention belongs to the technical field of motor control, and relates to a topology and method for realizing current sensor calibration in a dual-motor drive system, in particular to a topology and method for realizing mutual calibration of multiple current sensors in a dual-motor drive system without a bus current sensor. . Background technique [0003] A multi-motor system consists of a series of motor subsystems that can share the load torque. Compared with multiple single-motor systems, multi-motor systems not only reduce costs by sharing some resources, but are also easy to expand by adding new drives. Multi-motor systems are widely used in some industries that require high speed synchronization, angle synchronization, reliability or easy scalability, such as paper mills, textile industries, and steel mills. [0004] In the process of multi-motor drive, the feedback current accuracy of the phase current sensor directly affects the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/04H02P6/28H02P23/14H02P25/022H02P27/06
CPCH02P6/04H02P6/28H02P23/14H02P25/022H02P27/06H02P2006/045H02P2207/05H02P2205/01
Inventor 鲁家栋宋宇格胡义华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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