Outer Rotor Brushless Motor Torque Holding Portion
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Solution Overview
Problem
Existing outer rotor type brushless motors face challenges in achieving optimal and flexible setting of holding torque due to structural constraints that limit both the attainment of high holding torque and precise control over rotation.
Innovation Solution
The design incorporates a rotor portion with a rotor frame, shaft, and rotor magnet, along with a stator portion and a torque holding portion featuring different salient pole configurations, materials, and winding arrangements to achieve flexible and optimal holding torque settings, including separate rotor magnets and bent second salient pole portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the holding torque is increased by using the stator core as in conventional methods, then the holding torque is improved, but the structural constraints for ensuring optimum rotation control make it difficult to obtain the optimum holding torque and fine-set the holding torque value
Solution Approach 1:
The invention divides the stator into two separate functional portions: a stator portion for rotation control and a torque holding portion for holding torque generation. This segmentation allows each portion to be independently optimized without structural constraints interfering with the other, enabling flexible setting of holding torque values while maintaining optimum rotation control characteristics.
Solution Approach 2:
The invention extracts the torque holding function from the stator core structure and creates a separate torque holding portion with second salient pole portions. This extraction removes the structural constraints that previously limited holding torque optimization, allowing independent design and flexible adjustment of holding torque values without affecting rotation control performance.
2Reliability
If the holding torque is increased to maintain rotor position under external force, then the position holding capability is improved, but the structural constraints limit the ability to achieve high holding torque with precise control
Solution Approach 1:
By segmenting the stator into separate stator portion and torque holding portion, the invention eliminates structural constraints that previously prevented achieving high holding torque with precise control. Each portion can be independently designed to optimize its specific function without compromising the other.
Solution Approach 2:
The invention applies local quality by providing different salient pole configurations specifically in the torque holding portion that are optimized for holding torque generation, while the stator portion maintains its structure optimized for rotation control. This localized optimization enables high holding torque with precise control capability.
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 allows for high flexibility in setting the holding torque value and enables the realization of optimal holding torque, enhancing the motor's ability to maintain position against external forces without structural constraints affecting rotation control.
Implementation Method 1
a characteristic that a rotor is going to maintain a constant position is called a detent torque (holding torque)
Implementation Method 2
a winding wound around the first salient pole portion through the insulation
Data Source
AI summary
A motor includes a rotor frame; a shaft; first and second rotor magnets that are coupled with the shaft, formed separately, and spaced apart in an axial direction of the shaft; a stator portion having a stator core, a winding around the stator core, and a plurality of first salient pole portions; a torque holding portion facing the rotor magnets in a radial direction, being arranged between the rotor frame and the stator portion in the axial direction of the shaft, and having a plurality of second salient pole portions; and a circuit board arranged, in the axial direction of the shaft, on a side of the stator portion opposite the rotor frame. An electronic component is arranged at the circuit board.