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Motor counter electromotive force sampling system and method

A technology of motor current sampling and back electromotive force, which is applied in the field of wire feeding speed regulation system and motor back electromotive force sampling system, can solve the problems affecting the accuracy of back electromotive force sampling, reduce control complexity, ensure sampling accuracy, and improve sampling The effect of accuracy

Active Publication Date: 2018-05-04
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Method 2 will inevitably be affected by these factors, which in turn will affect the back EMF sampling accuracy

Method used

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  • Motor counter electromotive force sampling system and method
  • Motor counter electromotive force sampling system and method
  • Motor counter electromotive force sampling system and method

Examples

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Embodiment Construction

[0029] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0030] see figure 2 The motor back electromotive force sampling system includes a motor, a motor back electromotive force sampling unit and a motor back electromotive force sampling control unit connected to the motor back electromotive force sampling unit, the motor back electromotive force sampling control unit acquires the working state data of the motor, and According to the acquired working state data, the acquisition state of the motor back electromotive force sampling unit is controlled, so that the motor back electromotive force sampling unit samples the back electromotive force of the motor within the time period when the motor generates back electromotive force.

[0031] In a preferred embodiment, the motor back electromotive force sampling control unit includes three input terminals, and obtains the PWM driving state of the motor,...

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Abstract

The invention relates to a motor counter electromotive force sampling system and method. The system comprises a motor counter electromotive force sampling unit that is connected with a motor counter electromotive force sampling control unit; the motor counter electromotive force sampling control unit acquires working state data of a wire feed motor; the motor counter electromotive force sampling unit is controlled to stop sampling motor counter electromotive force upon power supply continuation and wire feed loop inductive load recovery; motor counter electromotive force is sampled to maximumextent upon motor counter electromotive force occurrence, sampling is not subject to wire feed loop impedance and loop inductance, and counter electromotive force sampling accuracy is improved accordingly. A hardware circuit is directly used herein to control motor counter electromotive force sampling; the sampling method is simple and effective, the circuit is simplified, and the cost is lowered;counter electromotive force sampling precision is guaranteed to maximum extent, and control precision is improved for a wire feed motor.

Description

technical field [0001] The invention relates to the field of welding power sources, in particular to the wire feeding speed regulation system part of the welding power source, in particular to a motor back electromotive force sampling system and method thereof. Background technique [0002] see figure 1 , the methods for sampling the back EMF of the motor of the wire feeding speed control system in the prior art include the following two methods, which are respectively: [0003] Method 1: Sampling the back electromotive force at a moment before the power output of the wire feeding motor, the sampling pulse width is fixed, and the sampling time is very short relative to the cycle. In the actual work of the wire-feeding motor, there are certain fluctuations in its back electromotive force, and the sampling time of the back electromotive force is short, which will affect the sampling accuracy of the back electromotive force. [0004] Method 2: Calculate the recovery time T1 b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/182
CPCH02P6/182
Inventor 不公告发明人
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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