Ring-Wound Claw Motor for Compact Electric Pump Design
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Solution Overview
Problem
Existing electric pumps driven by electric motors are large due to protruding coil ends, which hinders compact design and mountability, especially in vehicles where space is limited.
Innovation Solution
The electric pump design features a core with alternating claw magnetic poles and a coil wound in a ring form around the core, eliminating coil ends and allowing for a more compact structure by integrating the pump and motor housings with a non-magnetic material, enabling efficient cooling and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a coil is wound around the stator core so that the coil reciprocates along the drive shaft, then the electric motor can generate stator torque, but the coil ends protrude at both ends of the stator core making it impossible to reduce the axial length
Solution Approach 1:
The patent transitions from conventional linear coil winding to a ring-shaped coil configuration that wraps around the stator core in a closed loop. This dimensional change eliminates the need for coil ends extending axially, as the coil now circulates around the core perpendicular to the axial direction, thereby reducing the axial length while maintaining the electromagnetic interaction necessary for torque generation
Solution Approach 2:
The patent integrates the coil structure with the stator core by positioning the ring-shaped coil to closely follow the outer circumference of the core. This merging of the coil path with the core geometry eliminates wasted space and allows the coil to be contained within a compact axial envelope, directly addressing the contradiction between generating sufficient torque and minimizing axial dimensions
2Weight of stationary object
If the pump and motor housings are integrated with non-magnetic material, then the size and weight are reduced, but cooling efficiency must be maintained
Solution Approach 1:
The patent employs non-magnetic material for the integrated pump and motor housings to reduce weight and size while eliminating magnetic interference. This material choice resolves the contradiction by providing structural integrity and compactness while the separate cooling system design ensures thermal management requirements are met without compromising the weight reduction benefit
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 design results in a smaller, more mountable electric pump with improved cooling efficiency, reduced weight, and enhanced vehicle performance by occupying less space in the engine room, facilitating better layout flexibility and higher power output.
Implementation Method 1
a coil which is wound around and along the cores in a ring shape
Implementation Method 2
an impeller which is rotated by an output shaft of the electric motor so as to discharge cooling water by use of centrifugal force
Data Source
AI summary
A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.