A rotor for DC electromotor

Abstract

The present invention provides a rotor for DC motor, belonging to motor manufacture technical field, mainly composed of a rotor core, a coil having a current commutation plate, a pair of commutation carbon brushes placed on the current commutation plate and a pair of over carbon brushes, one commutation brush is connected with the adjacent over carbon brush, the other commutation brush is connected with the adjacent the other over carbon brush; the intersecting angle of the line of the commutation brush and the line of the adjacent over carbon brush is 91-95 degree clockwise. The structure design is more reasonable and scientific, the change of the current commutation angle is matched and adapted with the stator magnetic field after forming DC motor with the stator, effectively enhancing and changing the distribution condition of the magnetic density, overcoming the lower torque zone, changing the motor output characteristic, effectively reducing the additional resistance load, having evident saving effect.

Description

technical field [0001] The invention relates to a rotor for a DC motor, which belongs to the technical field of motor manufacturing. Background technique [0002] There are small and medium power DC motors widely used in electric vehicles, light industrial products, and household appliances, or carbon brush commutation motors with parallel excitation, series excitation or complex excitation. In this way, the torque generated by the rotor coil at different angular positions in the magnetic field is different and alternates. Taking a single-turn rectangular planar coil as an example, when the coil plane is perpendicular to the magnetic field, the coil will not generate a rotational moment, and the coil will rotate by inertia. The above situation will inevitably lead to unsmooth speed. When the load is applied, the running vibration of the motor will inevitably occur. This will increase the harmful additional dynamic load and do more useless work, thus resulting in a decrease ...

AI Technical Summary

Problems solved by technology

The above situation will inevitably lead to unsmooth speed. When the load is applied, the running vibration of the motor will inevitably occur. This will increase the harmful additional dynamic load and do more useless work, thus leading to a decrease in the efficiency of the motor.

This is also the problem of low efficiency, high power consumption, and short range of electric vehicles currently using DC motors as power devices.

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