Compensating voltage regulator for self-starting permanent magnet synchronous motor of pumping unit

Abstract

The invention discloses a compensation type voltage stabilizer of a pumping unit self-starting permanent magnet synchronous motor. The voltage stabilizer comprises a stator system and a voltage stabilizing system. A boost start mode including triangular start and star operation is adopted by the start system. During start, a normally-open control switch is pressed, a triangular contactor coil is electrified, an engine is started in the triangular boost start mode, a bypass contactor coil is electrified at the same time, a voltage stabilizing system is bypassed, at the moment, a normally-closed contact of a time relay begins to time, the normally-closed contact of the time relay is switched off when time is up, a normally-open contact is switched on, the triangular coil loses power at the same time, the normally-closed contact of the triangular contactor is switched on, a star type contactor coil is powered on, a motor synchronously operates, the bypass contactor is released, and accordingly a voltage stabilizer controller is in serial connection with a motor circuit and works at a set stabilized voltage. By means of the mode, the motor stably and reliably works under the set voltage of the largest power, and efficiency and the reliability of the self-starting permanent magnet synchronous motor are the best.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a compensating voltage stabilizer for a self-starting permanent magnet synchronous motor of an oil pumping unit. Background technique [0002] At this stage, the pumping unit motor is gradually replaced by a novel self-starting permanent magnet synchronous motor. The self-starting permanent magnet synchronous motor is a newly invented energy-saving motor. The pumping unit of the same oil well can replace the three-phase asynchronous motor with a motor with 70% power, run the motor synchronously, do not start the equipment, and the operation method is completely the same as the asynchronous motor , Simple structure, easy operation, energy saving and improved power factor. [0003] However, practice has proved that the starting torque of the motor needs to be increased, and the operating voltage must be higher than the rated voltage to achieve the highest efficiency. It is difficult to...

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Problems solved by technology

[0003] However, practice has proved that the starting torque of the motor needs to be increased, and the operating voltage must be higher than the rated voltage to achieve the highest efficiency. It is difficult to start when the voltage is lower than 340V; when the voltage is higher than 440V, the power factor drops significantly, and there is demagnetization. The line voltage at the best efficiency is between 390V-400V (adjustable). In addition, the oilfield line is long and the working condition is poor. In view of this, it is very important to develop a compensation transformer type voltage stabilizer to stabilize the power supply of each pumping unit motor. urgent

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