DC motor brush device
(1) Armature core 　　The armature core is the main part of the main magnetic circuit and is used to embed the discharge armature winding. Generally, the armature core is laminated with punched sheets made of 0.5mm thick silicon steel sheets to reduce the eddy current loss and hysteresis loss in the armature core when the motor is running. The laminated core is fixed on the rotating shaft or the rotor support. An armature slot is opened on the outer circle of the iron core, and a discharge armature winding is embedded in the slot.
(2) Armature winding The function of armature winding is to generate electromagnetic torque and induced electromotive force. It is the key component of China Reversible AC Motors Suppliers for energy conversion, so it is called armature. It is made up of many coils connected according to a certain rule. The coils are made of high-strength enameled wire or glass-fiber-coated flat copper wire. The coil sides of different coils are embedded in the armature slot in two layers, between the coil and the iron core and on The coil sides of the lower two layers must be properly insulated. In order to prevent the centrifugal force from throwing the coil edge out of the slot, the terminal part of the coil extending out of the slot is bound with thermosetting non-lattice glass tape.
(3) Commutator In a DC motor, the commutator is equipped with brushes, which can convert the external DC power supply into the alternating current in the armature coil, so that the direction of the electromagnetic torque is constant; in the DC generator , The commutator is equipped with brushes, which can convert the alternating electromotive force induced in the armature coil into the direct current electromotive force drawn from the positive and negative brushes.
(4) Rotating shaft Rotating shaft plays a role of supporting the rotation of the rotor. It needs a certain degree of mechanical strength and rigidity, and is generally made of round steel. Excitation method of DC motor The excitation method of DC motor refers to the problem of how to supply power to the field winding and generate the magnetomotive force to establish the main magnetic field. According to different excitation methods, DC motors can be divided into the following types.
1 . Separately excited DC motor field winding and armature winding have no connection relationship, and the DC motor powered by other DC power supply to the field winding is called separately excited DC motor.
2 . Shunt-excited DC motor The field winding of the shunt-excited DC motor is connected in parallel with the armature winding. As a shunt generator, the terminal voltage from the motor itself supplies power to the field winding; as a shunt motor, the field winding and the electric The shaft shares the same power source, which is the same as a separately excited DC motor in terms of performance.
3. Series-excited DC motor The excitation winding of the series-excited DC motor is connected in series with the armature winding and then connected to the DC power supply. The excitation current of this DC motor is the armature current.
4. Compound Excitation DC Motor Compound Excitation DC Motor has two excitation windings: parallel excitation and series excitation. If the magnetomotive force generated by the series winding and the direction of the magnetomotive force generated by the parallel winding are the same, it is called product compound excitation. If the two magnetomotive forces have opposite directions, it is called differential compound excitation.