来源：http://www.jnmcd.com 发布时间：2019-07-19 浏览：次
(1) Main magnetic pole
The function of the main magnetic pole is to produce air gap magnetic field. The main pole consists of two parts: the main pole dead center and the excitation winding. Dead heart is usually made of 0.5mm-1.5mm thick silicon steel sheet laminated riveting, divided into polar body and pole boot two parts, the upper part of the excitation winding is called the pole body, the lower part of the widened pole boot is called the pole boot, pole boot is wider than the pole body, which can adjust the distribution of magnetic field in the air gap, and is convenient to fix the excitation winding. The excitation winding is made of insulated copper wire, which is wrapped on the main magnetic pole. The whole main magnetic pole is fixed on the seat with a screw.
(2) commutation pole
The function of commutation pole of DC motor is to improve commutation and reduce commutation spark between brush and commutator when motor is running. It is usually installed between two adjacent main magnetic poles. It consists of commutation pole dead center and commutation pole winding. The commutation pole winding is made of insulated wire, which is wrapped on the commutation pole dead center and the structure of main magnetic pole. The number of commutation poles is equal to that of the main magnetic poles.
The shell of the motor stator is called the base, which has two functions:
First, it is used to fix the main pole, commutation pole and end cover, and to support and fix the whole motor.
Secondly, the base itself is also a part of the magnetic circuit, which constitutes the magnetic path between the magnetic poles. The part through which the magnetic system passes is called the yoke. In order to ensure that the frame has sufficient mechanical strength and good magnetic conductivity, it is usually made of steel castings or welded by steel plates.
4) Brush Installation
Brush installation is used to introduce or draw DC voltage and current. Brush installation consists of brush, brush grip, brush rod and brush rod base. The brush is placed in the brush holder and pressed by 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 base, which must be insulated from each other. The brush rod base is mounted on the end cap or bearing inner cover, and the circumferential position can be adjusted and fixed after adjustment.
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