Development Trend of Traction Machine
Published time:
2025-10-31
In order to solve the "steering" problem of DC and pulse current traction motors, some countries have been using thyristor commutatorless traction motors and three-phase AC asynchronous variable frequency traction motors, and are testing magnetic levitation high-speed vehicles powered by linear asynchronous motors. The thyristor commutatorless traction motor is composed of a synchronous motor and a set of thyristor inverters
Thyristors and rotor position detectors are used to replace the commutator and carbon brush structure of DC traction motors. This type of electric motor has the advantages of a DC motor without the difficult problem of "commutation". However, thyristors and their control systems are quite complex, so electronic components directly affect the operational reliability of electric motors. The three-phase AC asynchronous variable frequency traction motor has a simple structure, reliable operation, and low cost, making it an ideal traction motor. However, due to the need for variable frequency speed regulation, its development and application were once limited. In the 1960s, the development of high-power thyristor frequency converters enabled asynchronous motors to achieve variable frequency speed regulation. Many locomotives and bullet trains in various countries have adopted three-phase AC asynchronous variable frequency traction motors. The Federal Republic of Germany and Japan are using linear asynchronous motors on their experimental maglev high-speed vehicles. Its primary winding is laid on the ground guide rail and powered by a variable frequency power supply on the ground to generate a traveling wave magnetic field. By adjusting the frequency of the power supply, the speed of the maglev high-speed vehicle can be changed. The secondary winding is the reaction board, installed on the frame of the vehicle. The interaction between the primary traveling wave magnetic field and the secondary induced current not only generates thrust to propel the vehicle forward, but also generates magnetic pulling force to suspend the vehicle, and plays a role in dynamic braking during braking conditions.
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Development Trend of Traction Machine
2025-10-31
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