Segmented DC Motor Field Windings for Torque Ripple Reduction
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Solution Overview
Problem
The development of high-power direct current motors is restricted due to challenges with torque ripple, vibration, and electromagnetic interference, particularly in applications requiring low voltage and high current, such as electric vehicles and national defense equipment, where conventional series wound direct current motors struggle to resist detection technologies and have limitations in speed control and reliability.
Innovation Solution
A direct current motor design featuring multiple independent field winding units with insulated conductor strips, each operating independently to reduce current ripple and magnetic field ripple, ensuring consistent torque and improved reliability, and allowing for reduced current in each unit to lower manufacturing costs and enhance safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional series wound direct current motors are used for high-power applications, then high starting torque and wide speed range are achieved, but torque ripple, vibration, and electromagnetic interference increase
Solution Approach 1:
The motor is divided into multiple independent drive units, each with its own armature winding, field winding, and commutator segments. By segmenting the total power into multiple smaller units operating in parallel, the torque ripple from each unit is reduced while maintaining high total starting torque capability. The segmented structure allows each unit to contribute to the overall torque with reduced ripple characteristics.
2Power
If conventional series wound direct current motors are used for high-power applications, then high starting torque is achieved, but vibration and electromagnetic interference increase
Solution Approach 1:
The motor is divided into multiple independent drive units, each with its own armature winding, field winding, and commutator segments. By segmenting the total power into multiple smaller units operating in parallel, the torque ripple from each unit is reduced while maintaining high total starting torque capability. The segmented structure allows each unit to contribute to the overall torque with reduced ripple characteristics.
3Power
If field winding units operate at high current for high-power output, then high power is achieved, but manufacturing cost and reliability issues increase
Solution Approach 1:
The motor is divided into multiple independent drive units, each with its own armature winding, field winding, and commutator segments. By segmenting the total power into multiple smaller units operating in parallel, the torque ripple from each unit is reduced while maintaining high total starting torque capability. The segmented structure allows each unit to contribute to the overall torque with reduced ripple characteristics.
Solution Approach 2:
Multiple drive units are combined in parallel to achieve high total power output. Each unit operates independently but contributes to the overall motor performance. The merging of multiple reliable smaller units creates a system with high total power capability while maintaining the reliability benefits of lower current per unit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces electromagnetic interference, vibration, and noise, while ensuring reliable operation even if some field winding units fail, and lowers production costs, making it suitable for heavy-load and high-performance applications like electric vehicles and national defense equipment.
Implementation Method 1
a stator provided within the casing, including m main poles corresponding to the m pairs of brushes, and n field winding parts; and a rotor provided within the stator, including a plurality of armature windings
Implementation Method 2
each field winding unit is made up of field coils formed by winding an insulated conductor strip... around one pair of main poles corresponding to each other
Data Source
AI summary
The present invention provides a direct current motor, including: a casing; m pairs of brushes fixed within the casing; a stator provided within the casing, including m main poles corresponding to the m pairs of brushes, and n field winding parts; and a rotor provided within the stator, wherein each pair of main poles includes an S-polarity main pole and an N-polarity main pole, two neighboring main poles are different in polarity, the two brushes in each pair of brushes are arranged at neighboring positions, each pair of brushes includes an S-pole corresponding brush corresponding to the S-polarity main pole, and an N-pole corresponding brush corresponding to the N-polarity main pole, each field winding part includes m field winding units corresponding to the m pairs of main poles, respectively, each field winding unit is made up of field coils formed by winding an insulated conductor strip, which is made of a metal wire coated with an insulating layer, around one pair of main poles corresponding to each other, and m is a positive integer not less than 2, and n is 1 or 2.