In the circuit of the motor is indicated by the letter M (with the old standard D), its main function is to produce a driving torque, as a power source by various mechanical or electrical. .
The main types of electric motor
According to the structure and operation principle can be divided: can be divided into a DC motor, induction motor, synchronous motor.
2. The brushless DC motor
brushless DC motor is implemented using semiconductor switching devices electronically commutated, i.e., instead of the traditional brush and the commutator contact with electronic switching devices. It has high reliability, commutation spark-free, low mechanical noise is widely used in high-grade tape deck, video recorders, electronic equipment and office automation equipment.
by a permanent magnet brushless DC motor rotor, multi-pole stator winding, the position sensors and other components. Rotor position sensing by the position change, a certain order along the commutation of current in the stator winding (i.e., the detection of the rotor poles relative to the stator winding position, and generates a sense signal at the position location determination, a signal processing circuit after conversion to control the power switching circuit for switching the winding current according to a certain logic). Working voltage of the stator winding of the switching circuit controlled by an electronic position sensor to provide an output.
advantages:
DC motor having a fast response, a large starting torque from zero speed to rated speed comprising rated torque performance can be provided.
3. Induction Motor
into the AC induction motor and the AC induction motor commutator motor. The induction motor is divided into single-phase asynchronous motors, DC motors and AC motors repulsion.
Principle:
1, when the three-phase induction motor when the access phase AC power supply, three-phase stator windings of three phase currents flowing through the three-phase magnetomotive force (rotating stator magnetomotive force) and generates a rotating magnetic field.
2, the rotating magnetic field of the rotorConductors relative cutting motion, according to the principle of electromagnetic induction, an induced electromotive force of the rotor conductor and induced current.
3, according to the law of electromagnetic force, the rotor carrying conductor in a magnetic field by the electromagnetic force, form an electromagnetic torque, the rotation of the rotor, when the motor shaft with a mechanical load, it is output externally mechanical energy.
Advantages:
It has a simple structure, easy to manufacture, use and maintain, and reliable operation and low mass, low cost and the like.
4 magnet synchronous motor
starting permanent magnet synchronous motor is an asynchronous permanent magnet synchronous motor, the magnetic field system consists of one or more permanent magnets composition, usually from cast aluminum or copper inner squirrel cage rotor bars welded, the desired number of poles of the permanent magnet poles lined apparatus. Similar to the asynchronous motor stator structure.
When the stator winding is powered, the principle of the motor to turn the movable induction motor starting, when the acceleration operation to the synchronous speed, the synchronous electromagnetic torque generated by the permanent magnetic rotor and a stator magnetic field (magnetic field of the permanent magnet rotor synthesized reluctance torque and the stator magnetic field generating electromagnetic torque generated by) the pull-in rotor, the motor into the synchronous operation.
Motor reluctance synchronous reluctance synchronous motor, also known as reactive synchronous motor, a reluctance torque generated by the synchronous motor rotor unequal cross-axis and direct-axis magnetoresistive stator asynchronous motor with a stator similar structure, but different rotor structures.