Different connection motor

Abstract

The invention relates to a different connection motor, for solving the technical problems of large size, heavy weight, large mechanical loss and rotation difference, quite low efficiency, unstable speed control, low power factor, poor speed regulation precision and high maintenance cost of a conventional fluid coupling device. The different connection motor comprises a primary motor working under power frequency and a secondary motor working under variable frequency. A planetary gear mechanism is connected between the primary motor and the secondary motor, the planetary gear mechanism is provided with a planet carrier, and the planet carrier is fixedly connected with an output shaft. The different connection motor can be used for motor driving or wind power generation.

Description

technical field [0001] The invention relates to a motor, in particular to a different-connected motor in which a power-frequency motor and a variable-frequency motor are connected together by a planetary gear mechanism. Background technique [0002] The hydraulic coupling is a non-rigid coupling with liquid as the working medium. When the input speed is constant, the output speed and torque are changed by changing the fullness of the working chamber (usually adjusted by a catheter). Hydraulic couplings are widely used in high-power fans and transportation machinery. [0003] The output shaft of the motor is connected with the input shaft of the hydraulic coupling, and the output shaft of the hydraulic coupling is connected with the driven load. When in use, the motor starts with no load first, and then the current and torque change from small to large. The output shaft of the hydraulic coupler drives the high-power fan to start gradually and enters the working condition, wh...

AI Technical Summary

Problems solved by technology

[0007] At present, the generator sets that realize variable speed and constant frequency operation mainly include double-fed asynchronous generator sets, especially widely used in megawatt-level wind power systems. Double-fed asynchronous generator sets are equipped with gearboxes with high speed-up ratios as transmission components. A full-power frequency converter, the gearbox is large in size and weight, which increases the complexity and cost of the wind power generation system, and the maintenance cost is high

The sequential connection between the main shaft of the impeller of the wind power generation system and the input shaft of the gearbox, coupling, and doubly-fed asynchronous generator set requires accurate alignment, otherwise it will cause vibration, the bearing will be subjected to a large lateral force, and the probability of bearing damage greatly increase

For example, the engineering cost of replacing a 1.5MW gearbox is 800,000 yuan, and the unit price of the gearbox is 1.2 million yuan, so the various costs of the gearbox are very high

With the increasing capacity of wind turbines, gearboxes and doubly-fed asynchronous generators are also increasing, and manufacturing and processing are becoming more and more difficult, and machining accuracy is difficult to guarantee, and the cost is getting higher and higher.

Images