Rotary Motor Stator Wire Slot Layout for Arc Clearance
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Solution Overview
Problem
Conventional rotary motor stators face issues with high-voltage arc discharge due to close gaps between the coil ends and the metal ring frame, and interference during rotor rotation due to limited wiring area.
Innovation Solution
The rotary motor stator design features terminal securing blocks with skewed wire slots, increasing the insulation gap between the coil ends and the metal ring frame, and positioning these blocks to widen the wiring area by angling them between 10° to 85°, thereby avoiding direct contact and enhancing clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the terminal securing blocks are positioned close to the rotor accommodation space to reduce overall motor size, then the motor dimensions are reduced, but high-voltage arc discharge occurs due to the close gap between coil ends and the metal ring frame
Solution Approach 1:
The wire slots in the terminal securing blocks are arranged in a skewed state rather than symmetrically perpendicular to the radial direction. This asymmetric arrangement creates an acute angle between the wire slot lengthwise direction and the line passing through the center of the ring and the center of the terminal securing block, which increases the insulation gap distance and prevents arc discharge while maintaining compact dimensions
Solution Approach 2:
The solution transitions from a conventional perpendicular arrangement (one-dimensional alignment) to a skewed angular arrangement. By introducing an acute angle between the wire slot direction and the radial line, the design utilizes angular positioning in another dimension to increase the insulation gap without increasing the radial distance to the metal ring frame
2Volume of moving object
If the terminal securing blocks are positioned close to the rotor accommodation space to reduce motor size, then the motor dimensions are reduced, but wiring area is limited causing interference during rotor rotation
Solution Approach 1:
The skewed positioning of terminal securing blocks creates asymmetric wiring paths that provide adequate clearance for rotor rotation. The acute angle arrangement allows wiring to be routed away from the rotor path, preventing interference while maintaining compact motor dimensions
Solution Approach 2:
By arranging wire slots at an acute angle to the radial direction, the design utilizes angular positioning to create sufficient wiring area. This dimensional change in orientation allows adequate space for wiring without increasing the radial distance from the rotor accommodation space
3Ease of manufacture
If the wire slots are arranged perpendicular to the radial direction for simple manufacturing, then manufacturing is simplified, but the insulation gap is insufficient leading to arc discharge
Solution Approach 1:
The wire slots are arranged in a skewed state with an acute angle to the radial direction rather than perpendicular. This asymmetric arrangement increases the insulation gap distance between coil ends and the metal ring frame, effectively preventing arc discharge while remaining manufacturable
Data Source
AI summary
A rotary motor stator includes a plurality of stator teeth and a plurality of terminal securing blocks. The stator teeth are arranged in a ring to define a rotor accommodation space. Each stator tooth includes an inner side, a winding section and an outer side. The inner side is closer to the rotor accommodation space than the outer side, and the winding section is located between the inner side and the outer side for winding a coil. Each terminal securing block is fixed to the outer side of each stator tooth, and each terminal securing block includes a first wire slot configured to secure an end of the coil. An angle between a line passing through a center of the ring and a center of each terminal securing block and a lengthwise direction of the first wire slot is an acute angle.