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Electromagnetic DC motor

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Electromagnetic type DC motor consists of a stator pole and rotor (armature), commutator, commonly known as the commutator, brush, a casing, bearings and other composition,
Stator pole (main pole) of electromagnetic DC motor is composed of iron core and field winding. According to the excitation (the old standard known as the magnetizing) can be divided into series excited DC motor, and the shunt wound DC motor, separately excited DC motor and complex excited DC motor. Because of different excitation modes, the stator magnetic flux (from the stator pole of the excitation coil) after the law is different.
Series excited DC motor excitation winding and the rotor winding between the brush and the commutator series, proportional to the excitation current and armature current, stator flux increases with the increase of the excitation current torque approximation is proportional to the square of the armature current, speed with increase of torque or current decreased rapidly. The starting torque of up to 5 times more than the rated torque, short time overload torque of up to 4 times the rated torque, speed change rate is higher, the no-load speed is very high (generally do not allow it to run under no load). By using external resistors and series excitation windings are connected in series (or parallel), or will the series field winding in parallel to achieve speed.
The exciting current is constant, the starting torque is proportional to the armature current, and the starting current is about 2.5 times of the rated current. Speed is slightly decreased with the increase of current and torque, and the short time overload torque is 1.5 times of the rated torque. The rate of change is small, which is 5%~15%. Constant power through the weakened field to speed.
The excitation winding of the Shunt DC motor is supplied with an independent excitation power supply, and the exciting current is constant, and the starting torque is proportional to the armature current. Speed change is also 5%~15%. The constant power weakened field to increase speed or by reducing the rotor winding voltage to reduce speed.
In addition to the stator poles of the compound DC motor, the series winding (the number of turns in series) with the rotor winding is also provided with a series of winding. The direction of the magnetic flux generated by the series winding is the same as that of the main winding. The starting torque is about 4 times of the rated torque, and the short time overload torque is about 3.5 times of the rated torque. The rate of change of speed is 25%~30% (related to series winding). The speed can be adjusted by weakening the strength of the magnetic field.
Commutator commutator using silver copper and cadmium copper alloy material with high strength plastic molded into. Brush sliding contact with a commutator, providing the armature current of rotor winding. The electric brush of the electromagnetic direct current electric motor usually adopts the metal graphite brush or the electrochemical graphite brush. The core of the rotor is made of silicon steel sheet with 12 slots, 12 sets of armature windings, and each of the windings are connected in series, and then are connected with 12 pieces of reversing piece.