Stator Power Line Exit Angle for Compact Electric Working Machines
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Solution Overview
Problem
Conventional electric working machines require significant space for arranging motor power lines due to the traditional 120-degree phase shift configuration, limiting the downsizing potential of these devices.
Innovation Solution
The electric working machine design reduces the space needed for motor power lines by leading them out within a narrower angle range of 200 degrees, utilizing a stator configuration with a stator core and insulator that guides and secures the coils' wire paths, allowing for efficient winding and reduced expansion, thereby minimizing the housing space required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor power lines are led out with a phase shift of 120 degrees between coils, then proper three-phase power distribution is achieved, but the space required for arranging power lines inside the housing increases
Solution Approach 1:
The patent merges the exit positions of motor power lines by leading them out within a 200-degree range from the stator, consolidating what would traditionally require 360-degree distribution. This combining of exit points reduces the spatial footprint needed for power line arrangement while maintaining proper phase distribution through the winding configuration
Solution Approach 2:
The patent changes the spatial parameter of power line exit positions from the conventional 120-degree phase shift distribution (requiring 360-degree coverage) to a concentrated 200-degree range. This parameter change in angular distribution enables compact housing design while preserving electrical functionality
2Volume of stationary object
If the housing space is reduced for downsizing, then the overall machine size decreases, but the space for arranging motor power lines becomes insufficient
Solution Approach 1:
By merging the exit positions of all three-phase power lines within a 200-degree arc from the stator, the patent enables compact housing design. This consolidation of exit points eliminates the need for extensive space allocation for power line routing, allowing downsizing without increasing complexity
Solution Approach 2:
The patent optimizes the spatial arrangement by utilizing angular distribution along the stator circumference (circumferential dimension) rather than requiring radial or axial expansion. This dimensional approach allows efficient packing of power lines within a compact three-dimensional housing volume
Data Source
AI summary
The present application discloses an electric working machine. The electric working machine includes a motor including a stator. The stator includes: a stator core haring a plurality of tooth portions radially extending along a radial direction; and a first coil, a second coil, and a third coil wound on the tooth portions. A start end of the first coil and a finish end of the second coil, a start end of the second coil and a finish end of the third coil, and a start end of the third coil and a finish end of the first coil are led out within a range of 200 degrees from the stator.