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Brake control method of DC electromotor with brush without Hall subassembly, and system

A brake control, DC brush technology, applied in the direction of DC motor reduction gear, electric motor/converter plug, etc., can solve the problems of armature current error, undisclosed brake control, low accuracy of motor coefficient and speed, etc. , to achieve the effect of avoiding component error values

Inactive Publication Date: 2008-12-31
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires mathematical operations based on different motors to obtain motor coefficients, and the program portability is low
In addition, this method uses a differential amplifier circuit (Differential Amplifier circuit) to calculate the armature current, but it cannot ensure the matching between the used resistors and solve the problem of noise interference, so the calculated armature current also has errors
Therefore, using this erroneous armature current to substitute into the formula, the accuracy of the derived motor coefficient and speed is low
Moreover, the patent is used to calculate the motor coefficient and speed, and does not disclose how to perform brake control

Method used

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  • Brake control method of DC electromotor with brush without Hall subassembly, and system
  • Brake control method of DC electromotor with brush without Hall subassembly, and system
  • Brake control method of DC electromotor with brush without Hall subassembly, and system

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Embodiment Construction

[0048] The principle of the present invention is: by detecting the armature current value of the DC brushed motor, to know whether there is a current generated by the back electromotive force (Back Electromotive Force) caused by the rotation of the motor.

[0049] In the invention, when the system is started, the motor is braked in advance, and the static armature current value of the motor is detected and recorded when the motor is at rest.

[0050] When the motor needs to be braked, the reverse current is used to quickly decelerate the motor, and the armature current value is continuously detected, and the armature current value is compared with the static armature current value. When the armature current value is equal to the static armature current value, it means that the motor is in a static state, stop providing reverse current and complete the braking action.

[0051] Since the current value is the same, it means that the counter electromotive force generated by the mo...

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Abstract

The invention provides a DC brush motor brake control method and system without a Hall component. When the system starts, the motor is pre-braked to detect and record the static armature current value when the motor is at rest. Afterwards, when the motor needs to be braked, the reverse control voltage is output, and the armature current value is detected. When the detected armature current value is equal to the static armature current value, the brake control action of the DC brushed motor is completed. The present invention can achieve the purpose of completely braking and stopping the DC brushed motor in a short time under any state, and meanwhile, can be applied to different DC brushed motors to obtain the same effect.

Description

technical field [0001] The invention relates to a braking method and system for a DC brushed motor (Direct Current Brushed Motor), in particular to a braking control method and system for a DC brushed motor without a Hall Sensor. Background technique [0002] In general DC brushless motor (Brushless Motor) control systems, most of them are equipped with Hall components, so the speed FG (Frequency Generator) signal can be obtained directly, or the speed signal can be generated through an external chip by using three-phase control signals. And when the speed signal is zero, it means that the motor completes the braking and enters the stop state. [0003] In addition, many DC brushed motors also contain Hall components for better control performance and easy access to feedback (Feedback) signals. However, in the consumer market where the price is getting lower and lower, this kind of motor cannot meet the cost demand, so a DC motor with a simpler structure and no Hall componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P3/10
Inventor 黄兴生冯文俊
Owner SUNPLUS TECH CO LTD