Stepper Motor Housing Layout for Reduced Stacking Width
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Solution Overview
Problem
Existing stepper motors have a circular housing design that increases the width space when stacked, due to pin winding connections to external circuit boards, leading to poor user experience.
Innovation Solution
A stepper motor design with a shell, rotor assembly, and stator assemblies arranged axially, featuring an inclined structure in the housing to accommodate the circuit board and windings, allowing leads to extend through avoidance holes for direct connection, reducing the mounting space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pin winding connection method is used to connect leads to external circuit board, then electrical connection is achieved, but the width space of the product increases when stacked
Solution Approach 1:
The patent changes the connection approach from a planar pin winding method to a three-dimensional solution by routing leads through the axial direction of the housing. The leads pass through the stator assembly axially and connect to the circuit board on the end face, utilizing the Z-axis dimension rather than requiring additional width space in the XY plane. This dimensional transition effectively reduces the stacked width of the motor while maintaining all necessary electrical connections.
2Volume of moving object
If circular housing design is used, then structural simplicity is achieved, but the overall space occupation increases
Solution Approach 1:
The patent introduces an asymmetric inclined structure portion in the housing that protrudes inward from the cylindrical outer surface. This asymmetric feature creates a sloped surface that allows the circuit board to be positioned at an angle, enabling the leads to exit through the end face of the housing rather than requiring lateral space. The asymmetric modification to the otherwise symmetric cylindrical housing achieves compact stacking without significantly increasing structural complexity.
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
Facilitates miniaturization and convenient assembly by saving installation space between the winding leads and circuit board, while maintaining rotational performance.
Implementation Method 1
a winding sleeved to the fixation claw pole... the rotation of the stepper motor is realized by mutual driving of the steel magnet and the rotor and the winding
Implementation Method 2
The claw-type magnetic pole is disposed around and spaced apart from the steel magnet, and the rotation of the stepper motor is realized by mutual driving of the steel magnet and the rotor and the winding
Data Source
AI summary
Provided a stepper motor, includes a shell, a stator assembly, and a stator assemblies. The rotor assembly includes a rotary shaft and a steel magnet. The stator assemblies are sleeved to the rotor assembly and arranged in an axial direction of the rotary shaft. Each stator assembly includes a housing, a fixation claw pole, and a winding. The housing includes a housing body fixed to the shell, and an inclined structure portion formed by localized depression of an outer periphery of the housing body toward the rotor assembly. A circuit board is affixed to the housing body, an orthographic projection of the circuit board toward the rotor assembly at least partially falls into a confine of the inclined structure portion, the inclined structure portion is provided with an avoidance hole, and a lead of the winding extends out via the avoidance hole and is electrically connected to the circuit board.