Motor
It refers to all machines that can convert mechanical energy into electrical energy and electrical energy into mechanical energy. Specifically referring to generators, electric energy machines, and electric motors. Electric motor and its related concepts. Definition of electric motor: It refers to an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Electric motors, also known as electric motors (commonly known as motors), are represented by the letter "M" (formerly known as "D") in circuits. Its main function is to generate driving torque as a power source for electrical appliances or various machinery.
The generator is represented by the letter "G" in the circuit. Its main function is to convert mechanical energy into electrical energy. Currently, the most commonly used method is to use heat energy, water energy, etc. to drive the rotor of a generator to generate electricity. With the increasing maturity of wind power technology, wind power has gradually entered our lives. Transformers are referred to as stationary motors in some books. From the definition of the motor, it can be seen that there is a reason for saying so.
Types of electric motors
1.According to the different working power sources of electric motors, they can be classified into DC motors and AC motors. Among them, AC motors are also divided into single-phase motors and three-phase motors.
2. According to the structure and working principle, electric motors can be classified into DC motors, asynchronous motors, and synchronous motors. Synchronous motors can also be divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors are divided into three-phase asynchronous motors, single-phase asynchronous motors, and shielded pole asynchronous motors. AC commutator motors are divided into single-phase series excited motors, AC/DC dual-purpose motors, and repulsion motors. DC motors can be divided into brushless DC motors and brushed DC motors according to their structure and working principle. Brushed DC motors can be divided into permanent magnet DC motors and electromagnetic DC motors. Electromagnetic DC motors are divided into series excited DC motors, parallel excited DC motors, separately excited DC motors, and compound excited DC motors. Permanent magnet DC motors are divided into rare earth permanent magnet DC motors, ferrite permanent magnet DC motors, and aluminum nickel cobalt permanent magnet DC motors.
3. Classified by starting and operating modes: According to different starting and operating modes, electric motors can be divided into capacitor starting single-phase asynchronous motors, capacitor running single-phase asynchronous motors, capacitor starting single-phase asynchronous motors, and phase separated single-phase asynchronous motors.
4. Classified by purpose, it can be divided into drive motors and control motors. Electric motors for driving are further divided into electric motors for power tools (including drilling, polishing, grinding, slotting, cutting, and expanding tools), electric motors for household appliances (including washing machines, electric fans, refrigerators, air conditioners, recorders, video recorders, DVD players, vacuum cleaners, cameras, electric blowers, electric shavers, etc.), and electric motors for other general small mechanical equipment (including various small machine tools, small machinery, medical equipment, electronic instruments, etc.). Control motors are divided into stepper motors and servo motors.
5. According to the structure of the rotor, electric motors can be classified into cage induction motors (formerly known as squirrel cage asynchronous motors) and wound rotor induction motors (formerly known as wound rotor asynchronous motors).
6. According to the operating speed, electric motors can be classified into high-speed motors, low-speed motors, constant speed motors, and speed regulating motors. Low speed motors are divided into gear reduction motors, electromagnetic reduction motors, force sensing motors, and claw pole synchronous motors. Adjustable speed motors can be divided into stepped constant speed motors, continuously variable speed motors, stepped variable speed motors, and continuously variable speed motors. They can also be divided into electromagnetic speed motors, DC speed motors, PWM frequency conversion 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 remains synchronous regardless of the load size.
