Modular Electric Motor Body With PCB Chamber and Bearing Wall
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Solution Overview
Problem
The existing electric motor technologies are not versatile enough to be used across different types of electric hand-held power tools, leading to increased production and development costs due to the need for multiple motor designs.
Innovation Solution
A modular main body for electric motors that can accommodate various configurations, including a rotor space, a laminated core, and a receiving space for a printed circuit board, allowing for different commutation types and adaptability to various requirements, with features such as overmolded components, a dividing wall for electrostatic protection, and a cover for contamination prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different electric motor designs are created for different hand-held power tools, then the motors can meet specific application requirements, but production costs and development costs substantially increase
Solution Approach 1:
The electric motor is divided into a modular main body and application-specific components. The main body contains universal elements (stator, rotor, commutator) that can be used across different tool types, while external components (housing, control electronics, power supply) are adapted for specific applications. This segmentation allows a single motor design to serve multiple hand-held power tool applications without requiring complete redesign for each tool type.
2Device complexity
If a single universal electric motor design is used for different hand-held power tools, then production and development costs decrease, but the motor cannot meet completely different application requirements
Solution Approach 1:
The main body of the electric motor is designed with universal functionality to operate in different hand-held power tool applications. The stator, rotor, and commutator are configured to provide consistent electromagnetic performance across various tools, while the system accepts different external components (brushes, control electronics, power supplies) to adapt to specific application requirements such as drilling, grinding, or sanding.
3Object-affected harmful factors
If the rotor space is encapsulated to prevent contamination and damage, then protection against harmful factors improves, but accessibility and assembly complexity may worsen
Solution Approach 1:
The commutator is nested within the rotor structure, which itself is housed within the stator assembly. The brush assembly is positioned to access the commutator through the rotor-stator interface without requiring complete disassembly of the motor housing. This nested arrangement protects internal components from contamination while maintaining accessibility for assembly and maintenance through strategically positioned access points.
Data Source
AI summary
The invention relates to abasic body (1) for an electric motor (2), which comprises the following features: a substantially cylindrical outer wall (3), which forms a rotor space (4) for receiving a rotor (5) at least partially inside the outer wall (3) and on which a winding (6) can be mounted at least partially outside the latter; a laminated core (7) which is held by the outer wall (3); a receiving space (9) which serves to receive a printed circuit board (12) or another component of the electric motor (2) and which adjoins the rotor space (4); a partition wall (10) separating the receiving space (9) from the rotor space (4); at least one orienting device (13) for positionally orienting the printed circuit board (12) or the other component of the electric motor (2) inside the receiving space (9); a receptacle (17) for a cover (18) which closes the rotor space (4), said receptacle being situated on the outer wall (3) on the side of the rotor space (44) opposite to the partition wall (10); and an inner wall (20), which adjoins the partition wall (10), for receiving a bearing (21) for the rotor (5), said inner wall, together with the outer wall (3), creating the receiving space (9).