1. According to the type of working power supply: can be divided into DC motors and AC motors.
1) DC motors can be divided according to the structure and working principle: brushless DC motors and brush DC motors.
Brush DC motor can be divided into: permanent magnet DC motor and electromagnetic DC motor.
Electromagnetic DC motor division: series-excited DC motor, parallel-excited DC motor, other-excited DC motor and compound-excited DC motor.
Permanent magnet DC motor division: rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and alnico permanent magnet DC motor.
2) which AC motors can also be divided: single-phase motors and three-phase motors.
2. According to the structure and working principle can be divided: can be divided into direct current motor, asynchronous motor, synchronous motor.
1) synchronous motor can be divided: permanent magnet synchronous motor, reluctance synchronous motor and hysteresis synchronous motor.
2) Asynchronous motors can be divided into: induction motors and AC commutator motors.
Induction motors can be divided into: three-phase asynchronous motors, single-phase asynchronous motors and shaded-pole asynchronous motors.
AC commutator motor can be divided into: single-phase series-excited motor, AC and DC dual-use motor and push repulsion motor.
3. According to the starting and running mode can be divided into: capacitor starting single-phase asynchronous motor, capacitor running single-phase asynchronous motor, capacitor starting running single-phase asynchronous motor and split-phase single-phase asynchronous motor.
4. According to the use can be divided into: drive motor and control motor.
1) drive motor can be divided into: electric tools (including drilling, polishing, grinding, slotting, cutting, reaming and other tools) with electric motors, home appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, video recorders, video disk players, vacuum cleaners, cameras, hairdryers, electric shavers, etc.) with electric motors and other general-purpose small machinery and equipment (including a variety of small machine tools.), Small machinery, medical equipment, electronic instruments, etc.) with electric motors.
2) control motor is divided into: stepping motor and servo motor.
5. According to the structure of the rotor can be divided into: cage induction motor (the old standard called squirrel cage asynchronous motor) and wire-wound rotor induction motor (the old standard called wire-wound asynchronous motor).
6. According to the operating speed can be divided into: high-speed motor, low-speed motor, constant-speed motor, speed motor. Low-speed motor is divided into gear motor, electromagnetic reduction motor, torque motor and claw pole synchronous motor.
Speed motors can be divided into step constant speed motors, stepless constant speed motors, stepless variable speed motors and stepless variable speed motors, but also can be divided into electromagnetic speed motors, DC speed motors, PWM inverter speed motors and switched reluctance speed motors.
The rotor speed of an asynchronous motor is always slightly lower than the synchronous speed of the rotating magnetic field.
The rotor speed of a synchronous motor is independent of the size of the load and is always maintained at a synchronous speed.
Extended information:
The principle of operation of a DC generator is that the alternating electromotive force (EMF) induced in the coil of the armature is transformed into DC power when led out of the brush end of the generator, by means of a commutator with the commutating action of the brushes. The principle of the DC electric potential is changed to DC electric potential when it is led out from the brush end by the commutator with brush commutation.
The direction of the induced electromotive force is determined by the right-hand rule (the magnetic susceptibility line points to the center of the hand, the thumb points to the direction of movement of the conductor, and the other four fingers point to the direction of the induced electromotive force in the conductor).
Working principle: the direction of the force on the conductor is determined by the left-hand rule. This pair of electromagnetic force formed in the armature a torque, this torque in the rotating motor is called electromagnetic torque, the direction of the torque is counterclockwise, attempting to make the armature counterclockwise rotation.
If this electromagnetic torque is able to overcome the resistive torque on the armature (e.g., the resistive torque caused by friction and other load torques), the armature can rotate in a counterclockwise direction.
The DC motor is an electric motor that runs on DC operating voltage and is widely used in record players, VCRs, video players, movie players, electric shavers, hairdryers, electronic watches, toys, and so on.
The excitation method of DC motor refers to how the excitation winding is supplied with power, generating the excitation flux potential and establishing the main magnetic field. According to the different excitation methods, DC motors can be divided into the following types.
1 he excitation: the excitation winding and armature winding no connection, and by other DC power supply to the excitation winding DC motor is called he excitation DC motor, permanent magnet DC motor can also be seen as he excitation DC motor.
2 parallel-excited: parallel-excited DC motor excitation winding and armature winding connected in parallel. As a parallel-excited generator, the motor itself is issued by the terminal voltage for the excitation winding power supply; as a parallel-excited motor, the excitation winding and the armature *** with the same power supply, from the performance of the same as the other excitation DC motor.
3 series excitation: series-excited DC motor excitation winding and armature winding in series, and then connected to the DC power supply. The excitation current of this DC motor is the armature current.
4 Re-excitation: Re-excitation DC motor has parallel excitation and series excitation of the two excitation windings. If the series-excited winding flux potential and the parallel-excited winding flux potential generated in the same direction is known as the cumulative re-excitation. If the two flux potential direction is opposite, it is called differential re-excitation.
Different excitation DC motor has different characteristics. In general, the main excitation of DC motor is parallel-excited, series-excited and re-excited, and the main excitation of DC generator is he-excited, parallel-excited and re-excited.
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