RU2005136219A - Asynchronous motor power supply - Google Patents

Claims (1)

1. An asynchronous electric motor power supply device having six inputs and three outputs, so that three-phase AC voltage of constant frequency is supplied to three inputs, DC voltage is supplied to two inputs, an electric motor enable signal is supplied to one input, and three outputs are connected to phase windings of the asynchronous pump motor consisting of a contactor having six power and one control input and three power outputs, a threshold element having four inputs and two outputs, a DC power relay, and it has one power input, one power output and one control input, a current sensor having one power input, one power output and one measuring output, a voltage sensor having two inputs and one output, a low-voltage inverter control law shaper having two inputs and one the output of the low-voltage inverter control unit, which has two inputs and four outputs, the low-voltage transistor unit connected by a single-phase bridge circuit, which has two power inputs, two power outputs and four control inputs, I transform direct current to a single-phase alternating current, step-up transformer, semiconductor rectifier, inductive-capacitive filter, each having two power inputs and two power outputs, connected in series, a driver of the law of control of a high-voltage inverter having two inputs and six outputs, a control unit of a high-voltage inverter having two inputs and one output, a block of transistors connected by a three-phase bridge circuit, having two power inputs, three power outputs and six control inputs, converting direct current into a three-phase alternating current with a constant voltage to frequency ratio, while the six power inputs of the contactor are connected to three inputs of a power supply device using an alternating voltage of constant frequency and three outputs of a block of high-voltage transistors connected via a three-phase bridge circuit, so that switching between these groups is performed by a signal from a threshold element, one output of which is connected to the control input of the contactor, and the second output with low-voltage and high-voltage control units and by the rotors, the four inputs of the threshold device are connected to three inputs of the power supply device by an alternating voltage of constant frequency, and one with the power output of the DC power relay; a direct current with an input of a current sensor, the output of which is connected to the first input of the driver of the low-voltage inverter control law, the second input of which is connected to the output of the voltage sensor, the output of the low-voltage inverter control law driver is connected to the input of the low-voltage inverter control unit, and the four outputs of the latter are with the control inputs of the low-voltage transistor unit connected via a single-phase bridge circuit, one power input of which is connected to the output of the current sensor, and the second to the device input DC power supply with a low potential line, and its outputs are connected to the primary winding of a step-up transformer, the secondary winding of which is connected to rectifier bridge, the outputs of which are connected to the inputs of the inductive-capacitive filter, and the outputs of the latter with the power inputs of the block of high-voltage transistors connected by a three-phase bridge circuit, the inputs of the voltage sensor and the inputs of the shaper of the control law of the high-voltage inverter, forming a control signal at which the value of the frequency to voltage remains constant, and the output of which is connected to one input of the control unit of the high-voltage inverter, the second input of which is connected is connected to the second output of the threshold element, and six outputs of the control unit of the high-voltage inverter are connected to six control inputs of the block of high-voltage transistors connected via a three-phase bridge circuit, three power outputs of the latter are connected to three power inputs of the contactor, three power outputs of which are connected to the outputs of the asynchronous power supply device electric motor.