Electric Locomotive Accessories-How To Choose A Motor

What is the principle of choosing a locomotive motor? Today, the editor of the electric locomotive manufacturer will talk about how to choose a motor: when the power source is selected, the parameters such as voltage and current are basically affirmed, but the choice of motors is very wide. Now there are DC motors and AC induction. Motors, permanent magnet brushless motors (AC synchronous motors) and switched reluctance motors. Motors are different, their characteristics and control methods are also different, and their working voltage can be selected between tens of volts to hundreds of volts.

The selection criteria of the battery locomotive motor are: excellent speed regulation performance; can complete the conversion of direct current to alternating current; can complete the voltage conversion between battery 1 and the motor; in addition, it is also required to complete braking regenerative power generation when the vehicle is braking. Accept departmental energy. The above-mentioned requests all need to rely on the control installation of the motor to complete. The driving motors on early electric vehicles mostly used DC motors, which was mainly due to the DC power provided by the battery.

Due to the large structure of the DC battery locomotive motor, the volume and inertia of the rotor are increased due to the armature winding, and the working conditions are limited by the mechanical commutator, which limits the progress of the motor speed, resulting in relatively low efficiency. In addition, the parts of the motor are prone to wear and tear on the aluminum alloy ladder, which often requires maintenance and repair, and the huge repair skills affect its service life. Therefore, it has been gradually replaced by the above three types of AC motors.

A new type of switched reluctance motor with advanced performance structure, a control system composed of a position detector, a current detector and a power converter, etc., is controlled by a microcomputer with strong information processing capabilities. The microcomputer accepts the control commands input from the outside, and integrates the information of the rotor position, speed and current of the motor from the position and current detectors. After analysis and processing, orders are issued to the power converter according to the command request to control the motor. Therefore, it has excellent speed regulation performance, and it is an ideal motor for battery locomotive.