Motor basic knowledge review and motor power and current comparison table
Motor (English: Electricmachinery, commonly known as "motor") refers to an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction.
The motor is represented by the letter M (the old standard is D) in the circuit. Its main function is to generate the driving torque. As the power source of the electric appliance or various machines, the generator is represented by the letter G in the circuit, its main The role is to use mechanical energy to convert into electrical energy.
1, according to the type of working power: can be divided into DC motor and AC motor.
1) DC motors can be divided according to structure and working principle: brushless DC motor and brushed DC motor.
2) Among them, AC motors can also be divided into: single-phase motors and three-phase motors.
2, according to the structure and working principle can be divided: can be divided into DC motor, asynchronous motor, synchronous motor.
1) Synchronous motors can be divided into: permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors.
2) Asynchronous motors can be divided: induction motors and AC commutator motors.
3. According to the starting and running modes, it can be divided into: a capacitor-starting single-phase asynchronous motor and a capacitor-operated single-phase asynchronous motor.
Capacitor start-up type single-phase asynchronous motor and split-phase single-phase asynchronous motor.
4, according to the use can be divided: drive motor and control motor.
1) Drive motor can be divided: power tools (including drilling, polishing, polishing, grooving, cutting, reaming, etc.)
Use electric motors, household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.)
Electric motors are used in electric motors and other general small mechanical equipment (including various small machine tools, small machines, medical equipment, electronic equipment, etc.).
2) The control motor is divided into: a stepping motor and a servo motor.
5, according to the structure of the rotor can be divided: cage induction motor (old standard called squirrel cage asynchronous motor) and wound rotor induction motor (the old standard called winding asynchronous motor).
6, according to the operating speed can be divided: high-speed motor, low-speed motor, constant speed motor, speed control motor. Low-speed motors are further classified into gear reduction motors, electromagnetic reduction motors, torque motors, and claw-pole synchronous motors.
The working principle of the DC generator is to change the alternating electromotive force induced in the armature coil by the commutation function of the commutator and the brush to change the DC electromotive force when it is taken out from the brush end.
The direction of the induced electromotive force is determined according to the right-hand rule (the magnetic line is pointing to the palm of the hand, the thumb is pointing to the direction of movement of the conductor, and the other four fingers are pointing in the direction of the induced electromotive force in the conductor).
The direction of the conductor's force is determined by the left-hand rule. This pair of electromagnetic forces forms a moment acting on the armature. This torque is called electromagnetic torque in the rotating machine. The direction of the torque is counterclockwise, in an attempt to rotate the armature counterclockwise. If this electromagnetic torque can overcome the resistive torque on the armature (such as the resistive torque caused by friction and other load torque), the armature can be rotated counterclockwise.
DC motors are motors that operate on DC operating voltage and are widely used in recorders, video recorders, DVD players, electric shavers, hair dryers, electronic watches, toys, etc.
Power and wire diameter relationship (national standard copper wire) when the power supply line is not very long
