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SIMILAR PRODUCTS
SGMRV-05ANA-YR11
SGMRV-05ANA-YR21
SGMRV-09ANA-YR11
SGMRV-13ANA-YR1A
SGMRV-13ANA-YR21
SGMRV-13ANA-YR31
SGMRV-20ANA-YR11
SGMRV-30ANA-YR12
SGMRV-30ANA-YR21
SGMRV-37ANA-YR12
The electromagnetic DC motor is composed of stator pole, rotor (armature), commutator (commonly known as rectifier), brush, housing, bearing and so on. The stator pole (main magnetic pole) of the electromagnetic DC motor is composed of iron core and excitation winding. According to the different excitation mode (the old standard is called excitation), it can be divided into series excitation DC motor, shunt DC motor, other excitation DC motor and compound excitation DC motor. Because of the different excitation mode, the law of stator pole flux (produced by the excitation coil of stator pole) is also different. The excitation current is proportional to the armature current, the magnetic flux of the stator increases with the increase of the excitation current, the torque is approximately proportional to the square of the armature current, and the rotational speed decreases rapidly with the increase of torque or current.
The starting torque can reach more than 5 times of the rated torque, the short time overload torque can reach more than 4 times of the rated torque, the speed change rate is large, and the no-load speed is very high (generally speaking, it is not allowed to run under no-load). The speed regulation can be realized by using the external resistor in series with the series excitation winding (or in parallel), or by replacing the series excitation winding in parallel. The excitation winding of parallel DC motor is parallel to the rotor winding, the excitation 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. The rotating speed decreases slightly with the increase of current and torque, and the short-term overload torque is 1.5 times of the rated torque. The speed change rate is small, 5% ≤ 15%. The speed regulation can be adjusted by weakening the constant power of the magnetic field. The excitation winding of DC motor is supplied by an independent excitation power supply, and its excitation current is also constant, and the starting torque is proportional to the armature current.
The speed change is also 5% ≤ 15%. The rotating speed can be increased by weakening the constant power of the magnetic field or by reducing the voltage of the rotor winding. In addition to parallel excitation windings, series excitation windings in series with rotor windings are also installed on the stator pole of compound DC motor (the number of turns is small). The direction of flux produced by series winding is the same as that of 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 speed change rate is 25% ≤ 30% (related to series windings). The rotating speed can be adjusted by weakening the magnetic field intensity. The commutator is made of silver, copper, cadmium, copper and other alloy materials, which is molded with high strength plastic. The brush slips in contact with the commutator to provide armature current for the rotor winding. The brush of electromagnetic DC motor usually adopts metal graphite brush or electrified graphite brush. The core of the rotor is made of silicon steel sheet, which is generally 12 grooves and embedded in 12 groups of armature windings. After each winding is connected in series, it is connected with 12 directional sheets respectively.