DC motor, brushless DC motor, brushed DC motor

Definition: energy ( DC motor ) or converts the mechanical energy into direct current electricity (DC generator) for rotating electrical machines. It is a DC motor of electric energy and mechanical energy conversion. Electric runtime when it is DC motor convert electrical energy into mechanical energy; for generating runtime is a DC generator, converts mechanical energy to electrical energy. Advantages and disadvantages: advantages: brushless dc motor with fast response, large starting torque, rotational speed from zero to the rated rotary speed with rated torque performance can provide. Disadvantage: because DC motors to produce the rated load constant torque performance of armature and rotor magnetic field required constant maintenance of 90°, this will be through the carbon brush and commutator. Carbon brush and commutator motor will produce sparks, toner so the outside will cause damage to the components, use is restricted.

DC motor inside the fixed ring permanent magnet, the current through the coil on the rotor to produce ampere force, when the rotor on the rotor and the magnetic field parallel, and then continue to turn the direction of the magnetic field will change, so the rotor at the end of the brush with the conversion The sheet is alternately contacted so that the direction of the current on the coil also changes, resulting in the direction of the Lorentz force unchanged, so the motor can maintain a direction of rotation. The working principle of the DC generator is to interpolate the armature coil in the alternating electromotive force, By the commutator with the brush of the commutation effect, so that when the brush from the brush leads to the principle of DC electromotive force. The direction of the induced electromotive force is determined by the right hand rule (the magnetic induction line points to the palm of the hand, the thumb is pointing to the direction of the conductor movement, ...