Surface cleaning apparatus having a brush motor internal of a rotating brush and brush motor for driving a rotatable brushing member
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Solution Overview
Problem
Existing brush motors for surface cleaning apparatuses generate excessive heat, which can lead to reduced efficiency and lifespan, and require larger, more expensive magnetic elements.
Innovation Solution
The motor comprises a plurality of axially spaced motor sub-units, each with a rotor and stator portion, using smaller magnets and distributing heat along the motor length for improved dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single unit motor is used, then the motor structure is simpler, but the heat generation is excessive and requires larger magnetic elements
Solution Approach 1:
The motor is divided into multiple motor sub-units (first motor sub-unit, second motor sub-unit, etc.) that are axially spaced along the motor axis. Each sub-unit has its own rotor portion, stator portion, and magnets. This segmentation distributes the heat generation across multiple smaller units, improving heat dissipation while reducing the size of individual magnetic elements compared to a single large motor unit.
2Ease of manufacture
If a single unit motor is used, then the manufacturing is simpler, but larger and more expensive magnetic elements are required
Solution Approach 1:
The motor is divided into multiple motor sub-units (first motor sub-unit, second motor sub-unit, etc.) that are axially spaced along the motor axis. Each sub-unit has its own rotor portion, stator portion, and magnets. This segmentation distributes the heat generation across multiple smaller units, improving heat dissipation while reducing the size of individual magnetic elements compared to a single large motor unit.
3Device complexity
If the motor is placed externally, then the motor structure is simpler, but the appliance size increases
Solution Approach 1:
The motor is positioned inside the rotatable output member (brushing member), with the motor sub-units axially spaced along the motor axis within the internal volume of the output member. This nesting arrangement allows the motor to be housed within the existing structure, reducing the overall appliance size without requiring additional external space.
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 reduces total heat generation, allows for smaller magnet usage, and enables the motor to be housed within the rotatable output member, reducing appliance size and enhancing heat dissipation.
Implementation Method 1
each rotor portion is operable to generate a rotor magnetic field, and each stator portion is operable to generate a stator magnetic field opposing the rotor magnetic field of the corresponding rotor portion, thereby driving rotation of the rotor portions
Data Source
AI summary
A surface cleaning apparatus has a dirt inlet, a rotatable brushing member, and a brush motor. The brushing member has first and second longitudinally opposed ends and a brushing member rotational axis extending longitudinally between the first and second opposed ends. The brushing member has a member cavity thereby defining an inner member volume and the brush motor is at least partially disposed within the inner member volume. The brush motor is drivingly connected to the rotatable brushing member. A thermally conductive fill is provided within the inner member volume and extends between the brush motor and the inner surface to promote heat transfer therebetween.