Commutation is a key issue of all commutator motors, which has a significant impact on the performance and life of the motor. AC series motors, which are widely used in small DC motors, are still commonly used to improve the commutation method. It has the characteristics of economy and simplicity, The brush shift angle of commutation provides a reliable theoretical basis for the design and manufacture of series motors.
The electromagnetic theory of mountain commutation knows that during commutation, the reactance potential e of the commutation element and the rotating potential e `If the magnitudes are equal, the polarities are opposite and cancel each other, the commutation will be greatly improved. `The size and polarity are changed by The magnetic field in the direction area is determined. In a motor without commutation poles, if the brushes are offset from the geometric neutral line on the commutator by an appropriate angle, the commutation area also follows the geometric neutral line on the armature Offset a corresponding angle, use the main pole magnetic field to replace the directional pole magnetic field, so that the commutation element obtains the necessary rotating potential to offset the reactance potential to improve the commutation.
