Research Of HCB Novel Motor Operating Mechanism

For high voltage circuit breaker, operation mechanism should fast response and have high opening and closing speed. Hydraulic mechanism and spring mechanism are used widely nowadays. But they are making up of complicated mechanism assembly, and parts is more, actuating mechanism complex, manufacturing technique requires higher, and moving procedure is uncontrolled. So, it is necessary for researching an operation mechanism with fewer parts, more simple construction, and moving procedure is controlled.In this paper, we analyzed the demand of novel motor operation mechanism and its driving motor for circuit breaker, compared the characteristics of different kinds of motors. The permanent magnetic brush-less motor is chosen as the driving motor of motor operation mechanism. According to the defects of existing operation mechanism, motor operation mechanism is designed for 40.5kV vacuum circuit breaker with which the model number is TD-40.5/1600-31.5. The relationships between the motor striking angle and contact stroke, the equivalent rotary inertia and counterforce characteristics during the motion of motor are gained after calculating the moving characteristics of motor operation mechanism. The preinstall stroke course of contactor is given according to the parameter of arc-chute. Calculate the dynamic characteristics of the circuit breaker as moving contactor moving with preinstall stroke course, the design standards of electric motor is given according to it. The permanent magnetic brushless DC motor is improved reference the properties of short moving stroke, big counterforce and higher speed requirement and so on of CB operation mechanism, then the permanent magnetic brushless DC motor with finity rotate angle is designed. Not only the features of quicker responding and bigger torque of rare-earth permanent magnetic brushless DC motor are reserved, and the defect of commutating spark and structure complex of DC motor is overcomed due to the electronic commutation, meanwhile, the features of no excitation loss and high efficiency of permanent magnetic motor are acquired and the motor structure is no commutation, more simple and control easier. The designed motor are simulated by using finite element software. The results indicate that the design is reasonable and performance is reliable. And data processing method are adapted to analysis dynamic characteristics of motor operation mechanism.The analyzed results indicate that the motor operation mechanism are of high response, short opening and closing time, quick speed of opening and closing. It is not only fit for the capability requirement of circuit breaker, but also can improve the opening and closing capabilities of circuit breaker. The moving course can be controlled easily, and the intelligentize operation are realzed. The structure of novel motor operation mechanism is much simple. It is significance to improve the intelligence level by means of adding the servo control of motor to overcome the uncontrolled property.