According to the vibration motor manufacturer, the working principle of the dc motor is to change the alternating electromotive force generated by induction in the armature coil into a direct current electromotive force when it is drawn from the brush end by the commutator and the commutator action of the brush.
From the commutator work to explain: the brush does not add dc voltage, with the prime mover drag the armature counterclockwise constant speed rotation, the two sides of the coil respectively cut the magnetic force line under the different polarity of the magnetic pole, and in which the induction generated electromotive force, electromotive force direction according to the right hand rule to determine.
Since the armature rotates continuously, it is necessary for the current-carrying conductor to be subjected to coil edges ab and CD in a magnetic field to alternately cut the lines of force under the N and S poles, although the direction of the induced electromotive force at each coil edge and throughout the coil is alternating.
The induced electromotive force in the coil is an alternating electromotive force, while the electromotive force at the end of brush A and B is A direct current electromotive force.
Because, in the process of armature rotation, no matter where the armature turns, because of the commutator and brush commutator action, the electromotive force induced by brush A through the commutator blade is always the electromotive force at the edge of the coil cutting the n-pole magnetic field line. Therefore, brush A always has A positive polarity.
In the same way, brush B always has negative polarity, so the brush end can lead to a pulse electromotive force of constant direction but varying magnitude.If the number of coils under each pole is increased, the degree of pulse vibration can be reduced and the dc electromotive force can be obtained.
This is how dc motors work.It also shows that the sub - dc motor is actually an ac generator with commutator.
According to the introduction of vibration motor manufacturers, from the basic electromagnetic situation, a dc motor in principle can work as a motor running, also can be run as a generator, but the constraints are different.
At the two brush ends of the dc motor, add dc voltage, input electric energy into the armature, mechanical energy output from the motor shaft, drag production machinery, electric energy into mechanical energy and become the motor;
If the prime mover is used to drag the armature of the dc motor, and the brush does not add dc voltage, then the brush end can lead to dc electromotive force as a dc power source, which can output electrical energy. The motor converts mechanical energy into electrical energy and becomes the generator motor.
The principle that the same motor can operate as an electric motor or as a generator.In motor theory it's called the reversible principle.
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Post time: Aug-31-2019
