A brushed DC motor capable of reducing electromagnetic excitation force

Abstract

The invention relates to a brush-contained direct current motor capable of reducing electromagnetic excitation force. The brush-contained direct current motor is characterized in that the motor comprises a stator base, a stator iron core, a stator magnetic pole, a rotor iron core, an exciting winding, a rotor shaft, bearings, rotor armature windings and slip-ring units. The stator base is fixed in the installation mode of a conventional motor. The stator iron core is fixedly arranged in the stator base. The stator magnetic pole is fixedly arranged in the stator iron core, and the exciting winding is wound on the stator magnetic pole or a permanent magnet is arranged on the stator magnetic pole. The rotor iron core is fixedly arranged on the rotor shaft and is located between the N-pole and the S-pole of the stator magnetic pole. The rotor shaft drives the rotor iron core to rotate around the axis and is fixedly arranged in the stator base through the bearing. The outer circumference of the rotor iron core is evenly provided with a plurality of first slots, and the rotor armature windings are arranged in the first slots. The slip-ring units are arranged on the rotor shaft and are located on one side or two sides of the rotor iron core. All phases of windings in the rotor armature windings are connected with an external static power supply circuit through the slip-ring units which make contact with one another in a sliding mode and an electric brush.

Description

technical field [0001] The invention relates to a DC motor, in particular to a brushed DC motor capable of reducing electromagnetic excitation force. Background technique [0002] Modern society cannot do without motors, and motors are used in transportation, industrial and agricultural production, information processing, and various fields of daily life. There are many types of motors with different structures, such as asynchronous motors, permanent magnet motors, electric excitation motors, etc. All types of motors generate vibration and noise during rotation. Noise is a kind of environmental pollution. If people work in a noisy environment for a long time, it will have adverse effects on health; vibration and noise in the military field will also cause harm; in daily life, excessive motor noise will also cause There must be a problem. For example, the noise of household appliances should be as small as possible, so as not to affect the normal life of people in the envi...

AI Technical Summary

Problems solved by technology

These three types of electromagnetic exciting force are caused by the nature of motors and power electronic devices, and it is extremely difficult to reduce and weaken this electromagnetic exciting force

For the first type of electromagnetic excitation force, the existing method can only be realized by reducing the air gap flux density of the motor, but this method will reduce the torque and power density of the motor

For the second type of electromagnetic excitation force, inclined grooves or closed grooves are often used, but the effect of inclined grooves is not obvious, and the process is complicated; closed grooves will increase the leakage reactance of the groove

For the third type of electromagnetic excitation force, the existing method is to increase the filter circuit, reduce the harmonics related to the switching frequency or increase the switching frequency, but adding the filter circuit increases the weight of the equipment and reduces the reliability; increasing the switching frequency will Increase loss, reduce efficiency

It can be seen that so far, there is no better solution to the vibration and noise of the motor.

Images