The role of DC motor stator

The structure of a DC motor should be composed of two major parts, the stator and the rotor, and the part that does not move during operation is called the stator.

Engineer • Source: Network Organizer • Author: Chen Cui • 2018-11-18 10:16 • 17475 views
0

DC motor stator
The structure of a DC motor should be composed of two major parts, the stator and the rotor, and the part that does not move during operation is called the stator.

The role of DC motor stator
1. Main pole

The role of the main pole is to generate the air gap magnetic field. The main pole is composed of two parts: the main pole core and the field winding. The iron core is generally made of 0.5mm ~ 1.5mm thick silicon steel plate punched and riveted. It is divided into two parts: the pole body and the pole shoe. The pole shoe is wider than the pole body, which can not only adjust the distribution of the magnetic field in the air gap, but also facilitate the fixing of the excitation winding. The excitation winding is made of insulated copper wire and is set on the main magnetic pole core. The whole main magnetic pole is fixed on the base with screws.

2. Commutation pole

The function of the commutation pole is to improve the commutation and reduce the commutation sparks that may be generated between the brush and the commutator when the motor is running. It is generally installed between two adjacent main magnetic poles. The commutation pole winding is made of insulated wire, and is set on the commutation pole core. The number of commutation poles is equal to that of the main magnetic pole.

3. Base

The shell of the motor stator is called the machine base, and the machine base has two functions: one is used to fix the main magnetic pole, commutation pole and end cover, and it plays the role of supporting and fixing the entire motor; the other is that the machine base itself is also a magnetic circuit. A part of the magnetic pole is used to form the magnetic path between the poles, and the part through which the magnetic flux passes is called the yoke. In order to ensure that the machine base has sufficient mechanical strength and good magnetic permeability, it is generally made of cast steel or welded by steel plates.

4. Brush device

The brush device is used to introduce or extract DC voltage and DC current. The brush device is composed of a brush, a brush holder, a brush rod and a brush rod seat. The brush is placed in the brush holder and pressed by a spring so that there is a good sliding contact between the brush and the commutator. The brush holder is fixed on the brush rod, and the brush rod is installed on the circular brush rod seat. must be insulated. The brush rod seat is installed on the end cover or the inner cover of the bearing, the circumferential position can be adjusted, and fixed after adjustment.