thank you...FOIWATER said:It has to do with control. In older traction applications involving DC motors (electric trains, electric vehicles (see komatsu fleet of 930E electric drive train), contactors are used for control. Due to the advent and easy implentation of power electronics (I am thinking IGBT) which allow you to convert a DC signal into a variable AC signal (better control of the frequency) You get better speed control.
Also induction motors have far less maintenance. I used to work as an industrial electrician maintaining a fleet of komatsu haul trucks (we had both AC and DC drive systems).
A frequent cause for maintenance was motor flashing (DC) and brush wear. Never once did I ever see a AC traction motor fail.
Traction application is the use of a motor to provide motion or power to a vehicle or machinery. It is commonly used in transportation vehicles such as cars, trains, and planes, as well as in industrial and agricultural machinery.
The type of motor used in traction application can greatly affect the performance, efficiency, and durability of the vehicle or machinery. Choosing the right type of motor is crucial in ensuring optimal operation and minimizing maintenance costs.
The most common types of motors used in traction application are DC motors, AC motors, and induction motors. DC motors are often used in electric cars and forklifts, while AC motors are commonly used in trains and industrial machinery. Induction motors are often used in escalators and elevators.
The best type of motor for traction application depends on the specific needs and requirements of the vehicle or machinery. DC motors are known for their high torque and efficiency, making them suitable for applications that require frequent starting and stopping. AC motors are known for their speed and reliability, making them suitable for high-speed applications. Induction motors are known for their cost-effectiveness and simplicity, making them suitable for simpler applications.
Some factors to consider when choosing a motor for traction application include power requirements, torque, speed, efficiency, size and weight limitations, and cost. It is important to carefully evaluate these factors and choose a motor that best fits the specific needs of the application.