Do you know how the commutator achieves work efficiency

Update:25 Aug 2020

Electric motors are important and important basic equipment in industry, transportation, national defense and daily life. Its downstream industries cover almost all the basic industries of the national economy. The inverter is one of the core components of the motor, and it is growing with the development of the motor industry.

If there is no steering effect, the motor can only be blocked and die without rotating half a circle, and only an electric brake can be used. This is a device that uses the centrifugal force generated when the motor rotates as the power, controls the size of the starting resistance, reduces the starting current of the motor, increases the starting torque, and can run the winding asynchronous electric power brushlessly.

This is mainly composed of housing, starting fluid, moving plate, spring, terminal, valve, exhaust valve and so on.
Because the starting current of this reactance is very small, the starting torque is large, and it automatically adapts to power and load changes. The characteristic steering, such as the protection motor, is a high-speed rotating device. The rotor winding is actuated by electromotive force and centrifugal force. It was previously driven by rated parameters. However, the welding of the rotor winding and the steering elevator is the weak link of the steering rotor. The soldering technology is combined with the measurement results of the DC resistance between the chips.

Basic technical situation of commutator
The commutator and the brush form a corresponding sliding friction pair in the motor. The influence of the commutator on the performance of the motor mainly depends on the electrical contact when the brush is sliding at a high speed under conditions (electric load, contact pressure, environmental conditions, etc.) behavior. In addition to transmitting longitudinal current, the commutator also has the task of current commutation in the short-circuit armature coil. These currents are the reverse current and reactance voltage generated when the main current commutates, causing the brushes to slide on the surface of the commutator to cause edge sparks and arcs. The sliding of the brush on the surface of the commutator will scratch its surface (generally the hardness of the brush material is relatively large), causing burnt, discoloration, and foggy residue on the surface of the commutator material, further deteriorating the electrical contact performance . The influence of the commutator on the performance of the motor depends on the process of achieving circuit conduction when it slides with the brush at a relatively high speed under the conditions. Although the description of this process is complicated and theoretical research is still under development, through comparative analysis of the operating conditions of micromotors, it can be determined that wear is a key factor leading to changes in contact resistance.

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