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Composition Structure Of DC Motor:
Nov 07, 2017


(1) main magnetic pole

The main magnetic pole is to produce air gap magnetic field. The main magnetic pole is composed of two parts, the main magnetic pole core and the exciting winding.

The core of general use 0.5mm ~ 1.5mm thick silicon steel lamination riveting pressure tight, is divided into two parts pole and the pole shoe, the above set of excitation winding part called pole, following widening part called pole, pole width to the body, not only can adjust the distribution of magnetic field in the air gap and, at a fixed excitation winding. The excitation winding is made of insulated copper wire and is sheathed on the main magnetic pole core. The main magnetic pole is fixed on the machine base with screws,

(2) Huan Xiangji

The function of the commutating pole is to improve the commutation and reduce the commutation spark between the brush and the commutator when the motor is running. It is usually installed between two adjacent main magnetic poles, which is composed of commutating pole core and commutating pole winding. The commutating pole winding is made of insulated wire and is sheathed on the commutating pole core. The number of commutating poles is equal to that of the main magnetic pole.

(3) frame

The shell of the motor stator is called the frame. The function of the machine frame is two:

One is used to fix the main pole, the reversing pole and the end cover, and the supporting and fixing function of the whole motor;

Two is the frame itself is part of the magnetic circuit, in order to constitute the magnetic path between the poles, the magnetic flux through the part called magnetic yoke. In order to ensure the frame has sufficient mechanical strength and good magnetic conductivity, generally cast steel or welded by steel plate.

(4) brush device

Brush device is used to introduce or draw out DC voltage and DC current. The brush device consists of brush, brush holder, brush rod and brush holder. 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 mounted on the ring shaped brush holder seat, so the brush holder must be insulated. The brush rod seat is arranged on the end cover and bearing cover, the circumferential position can be adjusted, adjusted to be fixed after.


(1) armature core

Armature core is the main part of the main magnetic circuit, and is used to insert armature windings.

The general armature iron core is made of punched sheet punched by 0.5mm thick silicon steel sheet, so as to reduce the eddy current loss and hysteresis loss in the armature iron of the motor. The laminated iron core is fixed on the rotating shaft or the rotor bracket. The outer circle of the iron core is provided with an armature slot and a slot armature winding is embedded in the slot.

(2) armature winding

Armature winding is to produce electromagnetic torque and induction electromotive force, which is the key component of DC motor for energy conversion, so it is called armature. It is composed of many coils (hereinafter called components) according to a certain rule is connected to the coil with high strength enameled wire or glass fiber enameled copper wire wound into a coil, different coil side is divided into two layers embedded in the armature slot, between coil coil and core layer between the two sides and both upper and lower must be properly insulated. In order to prevent centrifugal force, the coil edge is thrown out of the slot, and the slot is fixed with the slot wedge. The end part of the coil outside the slot is bound with thermosetting glass tape.

(3) commutator

In the DC motor commutator with brush, can be an external DC power supply is converted to alternating current armature coil in the direction of electromagnetic torque is constant; in the dynamo, the commutator with brush, the alternating induced electromotive force generated in the armature coil is converted to DC electric potential leads to positive and negative brush on. Commutator is a cylinder made up of many commutating pieces, and the commutating piece is insulated by mica.

(4) rotating shaft

The supporting function of rotating shaft rotating rotor needs a certain mechanical strength and stiffness, which is usually made of round steel