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Motor driving method, device, computer device, and computer-readable storage medium

A technology of motor drive and computer program, applied in the field of computer-readable storage media, to achieve the effect of increasing the starting speed and improving the dragging

Active Publication Date: 2021-10-01
宁波拓邦智能控制有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a motor driving method, aiming to solve the problem of rapid startup of brushless motors

Method used

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  • Motor driving method, device, computer device, and computer-readable storage medium
  • Motor driving method, device, computer device, and computer-readable storage medium
  • Motor driving method, device, computer device, and computer-readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An embodiment of the present invention provides a motor driving method, such as figure 1 As shown, the method includes:

[0027] S101. Obtain a preset PWM duty cycle, and obtain a counter electromotive force detection time point according to the PWM duty cycle;

[0028] S102. When the detection time point of the counter electromotive force is reached, the current counter electromotive force is detected;

[0029] S103. Obtain the current position of the rotor of the motor according to the detected current counter electromotive force, and enter a closed-loop state.

[0030] Since the back electromotive force is very weak when the speed of the motor is low, the interference of the switch on and off will submerge the back electromotive force signal of the motor. time), the back electromotive force of the motor is very pure, there is no interference, and the current position of the motor can be judged completely. Therefore, in the embodiment of the present invention, when...

Embodiment 2

[0033] An embodiment of the present invention provides a motor driving method, such as figure 2 As shown, the method includes:

[0034] S201. Determine the initial position of the motor rotor;

[0035] S202. Obtain a preset PWM duty cycle, and obtain a counter electromotive force detection time point according to the PWM duty cycle;

[0036] S203. When the detection time point of the counter electromotive force is reached, the current counter electromotive force is detected;

[0037] S204. Obtain the current position of the rotor of the motor according to the detected current counter electromotive force, and enter a closed-loop state.

[0038] In the embodiment of the present invention, since the motor can be given a greater start-up force during the first drag, on the basis of the method in Embodiment 1, a step of determining the initial position of the motor rotor is added to make the motor enter the motor faster. Closed loop state.

Embodiment 3

[0040] An embodiment of the present invention provides a motor driving method, such as image 3 As shown, step S201, determine the initial position of the motor rotor, including:

[0041] S301. Obtain the current of the sampling point of each phase of the motor;

[0042] S302. Determine the initial position of the motor rotor according to the magnitude of the current at the sampling point;

[0043] In the embodiment of the present invention, according to the 6 states of the motor, 6 groups of pulses AC, BC, BA, AB, BC, and CA are injected into each group. When the pulse is injected, a current is generated, and the currents of the sampling points of each phase of the motor are collected and compared with each other, and the phase with the largest current is the starting position of the motor rotor.

[0044] Wherein, the sampling point is the position where the current of each phase is maximum.

[0045] In the embodiment of the present invention, since the motor can be given ...

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Abstract

The present invention is applicable to the technical field of motor drive, and provides a motor drive method, device, computer device, and computer-readable storage medium. The method includes: obtaining a preset PWM duty cycle, and according to the PWM duty cycle, Obtain the detection time point of the back electromotive force; when the detection time point of the back electromotive force is reached, detect the current back electromotive force; calculate the current position of the motor rotor according to the detected current back electromotive force according to a preset calculation rule, And enter the closed loop state. The present invention obtains the preset PWM duty cycle, and according to the PWM duty cycle, obtains the detection time point of the back electromotive force, avoids the defect that the back electromotive force signal of the motor is submerged by the interference of the switching tube opening and closing; due to the low PWM When the level is low, the back EMF of the motor is very pure without interference, and the current position of the motor can be judged completely, so that the motor quickly enters the closed-loop state, quickly realizes the closed-loop, and improves the starting speed of the motor.

Description

technical field [0001] The invention belongs to the technical field of motor driving, and in particular relates to a motor driving method, device, computer device and computer-readable storage medium. Background technique [0002] When the brushless motors in the prior art are started, many types of brushless motors need to be debugged for a long time, especially brushless motors with a relatively small number of pole pairs, usually need to be debugged for a long time to achieve a stable start. The counter electromotive force is weak, so the brushless motor needs to be dragged to a certain speed before starting, and then the position of the rotor of the brushless motor can be accurately detected, and then the commutation operation can be performed to start the brushless motor stably. However, the start-up time required for such a start-up method will be longer, and due to the glitch effect of the turn-on and turn-off of the MOS tube, the brushless motor often mistakenly dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/182
CPCH02P6/08
Inventor 覃全兴殷正
Owner 宁波拓邦智能控制有限公司