Starting and operation changeable power supply under large loading of electric machine

Abstract

The invention provides a power device with motor large load subjacent startup and convertible circulation. It mainly includes a transformer with input power and output startup power and circulative power, the startup power of the transformer output and the circulative power are connected to a switch, the output of the switch is co0nnected to the output power, the switch is connected to a current controller, a current sensor is arranged on the output power, the output of the current sensor is connected to the input end of the current controller, the output end of the current controller is connected to the switch for controlling the action of the switch. The switch is a three phase double-throw switch with magnetic control and self-locks; the current sensor uses current mutual inductor.

Description

technical field [0001] The invention relates to a power supply, in particular to a power supply device which can be switched between starting and running under heavy load of a motor. Background technique [0002] The prior art discloses the invention patent application No. 011274131 submitted by the applicant to the State Intellectual Property Office of China. The name of the application is "a dual-voltage automatic voltage-regulating transformer". The voltage controller uses the measured voltage value to control the control switch. The electrical object of the transformer is the motor. As we all know, the motor is an inductive load. Under the inductive load, the alternating current is the voltage leading the current, and the switching of the control switch is extremely fast. Therefore, using the voltage as the measurement signal to control will inevitably lead the actual operation of the motor. However, the unfavorable disadvantage of advanced control appears, resulting in...

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Problems solved by technology

The electrical object of the transformer is the motor. As we all know, the motor is an inductive load. Under the inductive load, the alternating current is the voltage leading the current, and the switching of the control switch is extremely fast. Therefore, using the voltage as the measurement signal to control will inevitably lead the actual operation of the motor. situation, the adverse disadvantages of advanced control appear, resulting in unstable control

When there is a slight bad contact of any phase fuse on the primary side of the power transformer, the no-load voltage of the secondary side of the transformer is basically normal, but the voltage of the secondary side of the transformer under load (especially when the load changes periodically) varies with the load. Fluctuates due to changes in the size of the voltage, causing the voltage controller to oscillate with load changes, and quickly burn out the circuit breaker and other components

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