Motor-driven operating mechanism with thermal protector

Abstract

The invention relates to a motor-driven operating mechanism, in particular to a motor-driven operating mechanism with a thermal protector. The technical scheme provided by the invention is as follows: the motor-driven operating mechanism comprises a motor installed in an installation shell, wherein the motor is provided with a stator and a rotor; the stator is provided with a stator coil; a speed reducer and a linkage are arranged in the installation shell; the speed reducer is provided with an output gear which is connected with a circuit breaker spindle; a cam is arranged on the circuit breaker spindle and is connected with the linkage; the output gear of the speed reducer is meshed with a rotor gear of the rotor; a spring is arranged in the installation shell; and the thermal protector is arranged on the stator coil and is connected with the stator coil circuit in series. The invention can effectively prevent overcurrent of the motor-driven operating mechanism caused by turn-to-turn short circuit, overload, long idling, locked rotor, etc.

Description

technical field [0001] The invention relates to an electric operating mechanism, in particular to an electric operating mechanism with a heat protector. Background technique [0002] As the core power part of the circuit breaker, the electric operating mechanism is widely used in various circuit breaker industries. Its main function is to convert electrical energy into mechanical energy to provide power for the closing and opening (energy storage) of the circuit breaker. In use, it is generally used to share the overcurrent protection device with the circuit breaker to prevent the motor from burning out due to the temperature of the coil winding in the motor exceeding the allowable value. In actual work, the common overcurrent protection device has poor control over the size and time of the electric operating mechanism's overcurrent, because in most cases, the design of the overcurrent protection device of the circuit breaker should consider other electrical equipment such a...

AI Technical Summary

Problems solved by technology

In actual work, the common overcurrent protection device has poor control over the size and time of the electric operating mechanism's overcurrent, because in most cases, the design of the overcurrent protection device of the circuit breaker should consider other electrical equipment such as electromagnetic The starting current of iron, counter, etc. is designed to greatly exceed the normal working current. Therefore, the overcurrent caused by inter-turn short circuit, overload, stalling, etc. of the electric operating mechanism cannot provide good protection, and it is easy to burn out the electric motor. operating mechanisms and circuit breakers resulting in losses

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