A rotating electric machine must have two parts: static and rotating.
The static part of 1.DC motor is called stator.
Function-generating magnetic field
It consists of a main magnetic pole, a commutating pole, a frame and a brush device.
2. The rotating part of 2.DC motor is called rotor (usually called armature).
Function-generate electromagnetic torque and induced electromotive force.
It consists of armature core, armature winding, commutator, shaft and fan.
Commutator: an important part of DC motor
Function-Convert DC current flowing through the brush into alternating current in the winding or convert alternating electromotive force in the winding into DC electromotive force at the end of the brush.
The main pole is an electromagnet.
The iron core is made of 1- 1.5 mm thick steel plate.
Commutation pole (also called additional pole or interelectrode pole)
Function improvement commutation
The commutation pole is installed between the two main magnetic poles and is also composed of iron core and winding. The iron core is generally made of a whole piece of steel or steel plate. Commutation pole winding and armature winding are connected in series.
The current-carrying conductor will be subjected to a force in a magnetic field,
In order to subject the armature to an electromagnetic torque with a constant direction, the key points are as follows:
When the coil side is under magnetic poles with different polarities,
How to change the direction of the current flowing through the coil in time, that is, to carry out the so-called "commutation"
To this end, a device called commutator must be added.
The commutator match with that brush can ensure that the current at the coil side under each pole is alway in one direction,
The motor can rotate continuously.
This is how DC cars work.
There are things that don't need a commutator at present.
Related patents: The main magnetic pole of its motor is split into several independent sub-magnetic poles. The armature core adopts salient pole form. The excitation and controller provides the excitation winding on each sub-pole with a current with a specific pole position relationship. The commutation of armature current is replaced by the commutation of magnetic field of each sub-pole. Thus eliminating the commutating commutator on the armature winding. So that that terminal voltage and the capacity of the motor are not limit by the commutation problem.