Zhejiang Mingyuan Machinery Equipment Co., LTD. Product development trend

In order to solve the "steering" problem of DC and pulse-flow traction motors, some countries have been using thyristor inverter-less traction motors and three-phase AC asynchronous variable frequency traction motors, and testing the maglev high speed vehicles powered by linear asynchronous motors.

Zhejiang Mingyuan Mechanical Equipment Co., LTD., said that the thyristor Commutator-less traction motor is composed of a synchronous motor and a group of thyristor inverters. The thyristor and rotor position detector are used to replace the commutator and brush structure of the DC traction motor. This kind of motor has the advantages of a DC motor without the difficult "reversing" problem. But the thyristor and its control system are quite complex, so the electronic components directly affect the reliability of the motor. Three-phase AC asynchronous variable frequency traction motor is an ideal traction motor with simple structure, reliable operation and low cost.

However, its development and application have been limited because of the need for frequency control. In the 1960s, the development of high power thyristor frequency conversion device enabled the induction motor to realize frequency conversion speed regulation. Many countries have adopted three-phase AC asynchronous variable frequency traction motors for locomotives and high-speed trains.

The Federal Republic of Germany and Japan used linear asynchronous motors in their experimental maglev high speed vehicles. Its primary winding is laid on the ground guide rail, which is powered by the ground frequency conversion power supply to generate the traveling wave magnetic field, and the speed of the maglev high-speed vehicle can be changed by adjusting the power supply frequency. The secondary winding is the reaction plate, mounted on the frame of the vehicle. The interaction between the primary traveling wave magnetic field and the secondary induced current not only generates the thrust force that makes the vehicle move forward, but also generates the magnetic pull to suspend the vehicle, and plays the role of dynamic braking in the braking condition.