An emergency stop self-locking circuit for a DC motor

By using a parallel energy release circuit and a power failure detection circuit with MOSFETs in a DC motor, the problem of difficulty in stopping the motor quickly after a power failure is solved, realizing the motor's emergency stop function and miniaturizing the push rod, making it easier to install and use.

CN112583305BActive Publication Date: 2026-04-03ZHEJIANG JIECHANG LINEAR MOTION TECH
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Patent Information

Application Number
CN202011308090.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-11-20
Publication Date
2026-04-03
Estimated Expiration
2040-11-20

AI Technical Summary

Technical Problem

Existing DC motors are difficult to stop suddenly after a power outage, and the existing mechanical structure and relay components result in a large push rod size, which affects processing and installation.

Method used

An energy release circuit using MOSFETs connected in parallel across the motor terminals, combined with a power failure detection circuit to control the switching of the MOSFETs, utilizes the current generated by the motor's inertial rotation to achieve short-circuit braking, thus realizing emergency stop through the circuit.

Benefits of technology

It achieves the emergency stop function of the motor, while reducing the size of the push rod, making it easier to process and install, and relying on the rotating magnetic field to achieve self-locking when the power supply is not available.

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Abstract

This invention provides an emergency stop self-locking circuit for a DC motor, belonging to the field of motor braking technology. The emergency stop self-locking circuit includes a main circuit, an energy release circuit, and a power-off detection circuit. The energy release circuit consists of MOSFETs connected in parallel across the motor terminals, with the source and drain of the MOSFETs connected to the motor terminals respectively. The power-off detection circuit is a switching circuit used to control the on / off state of the MOSFETs. The switching circuit is connected to the gate of the MOSFETs. When the power supply is on, the switching circuit is off, and the MOSFETs are in the off state. When the power supply is off, the motor acts as a generator to provide current, the switching circuit is on, the MOSFETs become saturated, and the current provided by the motor flows from the positive terminal through the MOSFETs to the negative terminal, causing a short circuit. The advantage of this invention is that this structure allows the motor to achieve an emergency stop function while reducing the size of the push rod, facilitating processing and installation. This invention is used for emergency stop control of motors.
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