Compact Motor Stator Radial Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a continuous demand to make electric work machine motors more compact to enhance user ergonomics and usability, as larger motors can hinder smooth operation.
Innovation Solution
The motor design incorporates a stator with a stator core, insulator, coils, external terminals, coil terminals, short-circuiting members, and an insulating member where the insulating member is positioned radially inward of the stator core, allowing for a more compact radial design by optimizing the placement and connection of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is enlarged to accommodate traditional terminal arrangements, then electrical connections are simplified, but the motor size increases and ergonomics deteriorate
Solution Approach 1:
The patent repositions the insulating member from a radial arrangement to an axial arrangement, placing it on the axial side of the stator core rather than radially outward. This dimensional change allows terminals to be arranged more compactly in the radial direction, reducing motor size while maintaining electrical connection functionality.
Solution Approach 2:
The insulating member integrates multiple functions: it provides electrical insulation between the stator core and terminals, mechanically supports the terminals, and facilitates heat dissipation. This merging of functions into a single component reduces the number of separate parts needed, contributing to compact motor design.
2Reliability
If terminals are arranged radially outward for easy connection, then electrical connectivity is improved, but the radial size of the motor increases
Solution Approach 1:
The insulating member is positioned on the axial side of the stator core rather than radially outward, changing the spatial dimension where insulation and terminal support occur. This allows terminals to be arranged more efficiently in the radial direction without requiring excessive radial clearance, thus reducing motor volume while maintaining reliable electrical connections.
Solution Approach 2:
The insulating member acts as an intermediary component that mediates between the stator core and the terminals. It provides the necessary electrical insulation and mechanical support, enabling compact terminal arrangement while ensuring reliable electrical connectivity. The short-circuiting members also serve as intermediaries to establish electrical connections between terminals and coils.
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
This configuration enables the motor to be made more compact in the radial direction, facilitating easier user handling and operation while maintaining effective electrical connections.
Implementation Method 1
a motor comprising a rotor, which rotates about a rotational axis, and a stator, which is disposed around the rotor
Data Source
AI summary
An electric work machine (1) includes: a motor (21) having a rotor (23), which rotates about rotational axis (AX), and a stator (24), which is disposed around the rotor; and an output portion (25), which rotates when a rotational force is generated by the motor. The stator comprises: a stator core (33); an insulator (34), which is fixed to the stator core; a plurality of coils (35), which is fixed to the insulator; external terminals (63), to which power-supply lines are respectively connected; coil terminals (64), which are respectively connected to the coils; short-circuiting members (65), which are integral with the external terminals and the coil terminals and electrically connect the external terminals and the coil terminals to each other; and an insulating member (66), which supports the external terminals and the short-circuiting members. The insulating member is disposed more radially inward than an outer-circumferential surface of the stator core.