Motor (commonly known as "motor") is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction.The letter M is used in the circuit.Its main function is to produce a driving torque, as electrical or mechanical power source.The generator is represented by the letter G in the circuit.Its main function is to convert electrical energy into mechanical energy.
The motor mainly consists of an electromagnet winding or a distributed stator winding used to generate a magnetic field and a rotating armature or rotor and other accessories.Under the action of the stator winding rotating magnetic field, it has an electric current passing through the armature squirrel cage aluminum frame and is rotating under the action of the magnetic field.
Stator (stationary part)
Stator core: a part of the motor magnetic circuit on which the stator windings are placed;
Stator winding: it is the circuit part of the motor, which is fed with three-phase alternating current and generates rotating magnetic field.
Frame: the stator core and front and rear end covers are fixed to support the rotor, and play the role of protection and heat dissipation.
Rotor (rotating part)
Rotor core: as a part of the motor magnetic circuit and placed in the core slot rotor winding;
Rotor winding: cutting stator rotating magnetic field produces induction electromotive force and current, and forms electromagnetic torque to make the motor rotate;
Dc motor is a rotating motor that converts direct current energy into mechanical energy (dc motor) or mechanical energy into direct current energy (dc generator).It is a motor that can realize mutual conversion of direct current energy and mechanical energy.When it operates as a motor, it is a dc motor, which converts electrical energy into mechanical energy.The generator is a dc generator which converts mechanical energy into electrical energy.
Stepper motor is an open-loop control element stepper motor which converts electrical pulse signal into angular or linear displacement.In the case of non-overload, the motor speed and stop position only depend on the frequency and number of pulse signals, and are not affected by the change of load. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate at a fixed Angle according to the set direction.The angular displacement can be controlled by controlling the number of pulses to achieve accurate positioning.At the same time, the speed and acceleration of motor rotation can be controlled by controlling the pulse frequency.
Working principle of stepper motor
When an electric current flows through the stator winding, the stator winding generates a vector magnetic field.This magnetic field will cause the rotor to rotate at an Angle, so that the direction of a pair of magnetic fields in the rotor is consistent with the direction of the stator's magnetic field.When the stator vector magnetic field rotates by an Angle.The rotor also rotates at an Angle to the magnetic field.For each input pulse, the motor rotates at an Angle one step forward.The output angular displacement is directly proportional to the number of input pulses and the rotation speed is directly proportional to the pulse frequency.Change the order in which the windings are energized and the motor reverses.Therefore, the rotation of stepping motor can be controlled by controlling the number of pulses, frequency and the energizing sequence of each phase winding of the motor.
Unidirectional asynchronous motor
Induction motor, also known as induction motor, is an alternating current motor which is converted from electromechanical energy to mechanical energy by the interaction of air gap rotating magnetic field and rotor winding induction current to produce electromagnetic torque.
The working principle of single phase asynchronous motor
In an ac motor, the armature magnetomotive force is established when the stator winding passes through the ac current.Therefore, single-phase ac winding passes into single-phase ac to generate pulse vibration magnetomotive force, which can be decomposed into two rotational magnetomotive force sums with equal amplitude and opposite rotational speed, thus establishing forward and reverse magnetic field sums in the air gap.The two rotating magnetic fields cut the conductor of the rotor and generate the induced electromotive force and induced current respectively in the conductor of the rotor.
The current and magnetic field interact to produce positive and anti-electromagnetic torque.The forward electromagnetic torque attempts to make the rotor turn forward;The reverse electromagnetic torque attempts to reverse the rotor.These two torques, when superimposed, are the resultant torques that drive the motor.
Permanent magnet motor
Permanent magnet motor is a motor that USES permanent magnets to provide a magnetic field.When a motor does work, two conditions are required, one is the presence of a magnetic field, the other is the presence of a moving current in the magnetic field.