Optimized Brush Positioning for Ripple-Free Motor Efficiency
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Summary
Problems
Six pole and thirteen slot motors experience increased current ripple and torque ripple due to the increased number of short-circuited coils, leading to inefficient power transmission.
Innovation solutions
The motor design features brushes positioned at an angular interval of 63° to 66° around the rotary shaft, with a stator having six poles and a rotor with thirteen slots, and includes three divided cores with magnets, optimizing the brush and commutator dimensions to minimize current ripple and maximize torque.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If two brushes are disposed with an angular interval of 60° in a six pole and thirteen slot motor, then the motor structure is simple and easy to manufacture, but the current ripple and torque ripple are increased
Why choose this principle:
The patent changes the angular interval parameter of the brushes from the conventional 60° to a specific range of 63° to 66°. This parameter modification optimizes the commutation timing in the six pole and thirteen slot motor configuration, reducing the number of short-circuited coils and thereby minimizing current ripple and torque ripple while maintaining manufacturing simplicity.
Principle concept:
If the number of short-circuited coils is increased, then the motor can operate with standard brush positioning, but the current ripple amount is increased
Why choose this principle:
By adjusting the brush angular interval to 63°-66°, the patent modifies the commutation characteristics to reduce the number of coils that are short-circuited simultaneously. This parameter change maintains ease of operation with standard brush positioning while significantly reducing current ripple by optimizing the electrical angle at which brushes make and break contact with commutator segments.
Application Domain
Data Source
AI summary:
The motor design features brushes positioned at an angular interval of 63° to 66° around the rotary shaft, with a stator having six poles and a rotor with thirteen slots, and includes three divided cores with magnets, optimizing the brush and commutator dimensions to minimize current ripple and maximize torque.
Abstract
The present invention provides a stator including magnets having six poles; a rotor disposed inside the stator and including thirteen slots; a coil wound around the slot; a rotary shaft coupled to the rotor; a commutator coupled to the rotary shaft and connected to the coil; and a plurality of brushes disposed to be pressed against the commutator and located to have an angular interval of 63° to 66° in the circumferential direction of the rotary shaft, thereby providing advantageous effects in that a current ripple is minimized and a torque is maximized.