Permanent magnet synchronous servo submersible motor with extremely low rotating speed and method

Abstract

The invention relates to a permanent magnet synchronous servo submersible motor with an extremely low rotating speed and a method. According to the technical scheme, a motor stator assembly and a longmotor shaft are installed in a motor shell, and the motor stator assembly is composed of an electromagnetic wire and a motor stator; a plurality of sections of motor rotors are installed on the longmotor shaft, permanent magnet steel is attached to the motor rotors, a rotor centralizing bearing is installed between every two sections of motor rotors, and a sensor signal line is led out of a starpoint at the lower end of a motor shell, is led out through a preformed hole of a motor base and can be connected with an underground temperature and pressure measuring device. The magnetic poles with the same polarity of all the motor rotors are kept in the same straight line, and the rated rotating speed of the motor is determined by the number of the permanent magnet steel attached to the motor rotors and the motor stator offline mode. The submersible motor has the beneficial effects that when the motor works at the power frequency of 50Hz, the rotating speed is low, the starting torque islarge, the motor power cannot be sacrificed due to excessive reduction of the rotating speed, and the motor can be an optimal power source for a submersible direct-drive screw pump.

Description

technical field [0001] The invention relates to the technical field of mechanical oil extraction, in particular to an extremely low-speed permanent magnet synchronous servo submersible motor and a method thereof. Background technique [0002] In oil extraction, compared with the traditional asynchronous motor, it has demonstrated its advantages in energy saving and consumption reduction. Through the field test of the permanent magnet motor unit and the asynchronous motor unit used in the oil field, the tested permanent magnet motor greatly reduces the power grid. For reactive power, multiple permanent magnet motors are used in a larger block. It will improve the power factor of the grid as a whole, which is extremely beneficial for saving electric energy, reducing losses, and improving the power supply capacity of power transformation and distribution equipment. It will give users Bring significant economic and social benefits. [0003] At present, the permanent magnet moto...

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Problems solved by technology

[0005] The object of the present invention is to aim at the above defects in the prior art, to provide a very low speed permanent magnet synchronous servo submersible motor and its method, which can work at a power frequency of 50 Hz, and can adapt to the requirements of screw pumps for low speed. The speed is low and the starting torque is large, which solves the problem of difficult starting of the screw pump to a certain extent

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