Motor Stator Access Slot Layout for Compact Winding Connections
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Solution Overview
Problem
Existing motors in power tools face challenges in achieving compact dimensions while maintaining strong power output due to increased radial and axial dimensions caused by the connection relationship between the input and output ends of the winding and external power control wires.
Innovation Solution
The motor design includes a stator assembly with access slots for connecting terminal assemblies, featuring insulation material insertion members and wire hooking racks, and limiting protrusions to manage the dimensions and stabilize the winding connections, along with a housing structure that prevents rotation and enhances insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the radial dimension and axial dimension of the motor are increased to accommodate the connection relationship between the input end and output end of the winding and the external power control wire, then the motor can maintain strong power output, but the motor dimensions increase and compactness is reduced
Solution Approach 1:
The patent introduces a new spatial dimension by creating an access slot on the outer sidewall of the stator core, allowing the terminal assembly to connect to the winding ends through the radial direction rather than requiring increased axial or radial dimensions. This dimensional reorganization enables compact motor design while maintaining power output capability.
Solution Approach 2:
The access slot acts as an intermediary structure that facilitates the connection between the terminal assembly and the winding ends. This intermediate feature allows the power control wire to reach the winding ends without requiring the motor housing to be enlarged, thus resolving the contradiction between power output and compact dimensions.
2Volume of moving object
If the motor structure is made more compact to reduce dimensions, then the motor adapts better to power tools with limited space, but the connection relationship between the input end and output end of the winding and the external power control wire becomes more difficult to accommodate
Solution Approach 1:
The patent segments the motor structure by introducing a distinct access slot feature on the stator core, separating the winding connection function from the main motor housing. This segmentation allows the terminal assembly to be positioned and connected independently, facilitating easier wire connection in compact motor designs.
Solution Approach 2:
The access slot is pre-formed on the outer sidewall of the stator core during manufacturing, providing a ready-made pathway for the terminal assembly and power control wire. This preliminary preparation eliminates the need for complex assembly operations or housing modifications, making wire connection easier in compact motors.
Data Source
AI summary
A motor includes a stator assembly, a rotor assembly, and a terminal assembly. The stator assembly includes a stator core and a winding wound onto the stator core. The winding includes an input end and an output end. The rotor assembly includes a rotor shaft extending along a direction of a first straight line. The terminal assembly is configured to connect or fix the input end and the output end. The stator core includes first-type laminations. Each of the first-type laminations is provided with connection arms and a special-shaped portion. The special-shaped portions are configured to form an access slot which is configured to connect the terminal assembly when the first-type laminations are stacked along a direction parallel to the first straight line. The access slot is disposed on an outer sidewall of the stator core.