Reciprocating Switched Reluctance Motor With Crank Output
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Solution Overview
Problem
Existing switched reluctance motors face challenges in achieving high output while maintaining a compact size due to the need for large winding coils and increased stator and rotor diameters, leading to reduced occupancy rate, mechanical strength, and cooling efficiency issues, particularly in electric vehicle engines.
Innovation Solution
A reciprocating switched reluctance motor-driven engine design featuring a cylindrical stator with two stator cores and a piston-shaped mover, utilizing a crank mechanism to convert reciprocating movement into rotational motion, with expanded mover salient poles and guided movement to optimize magnetic flux and reduce occupied space, combined with a controller for precise excitation timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of turns of the winding coil is increased or the coil is made thick to flow large current to obtain high output, then the output increases, but the occupied space for the winding coil increases, leading to increased stator and rotor diameters
Solution Approach 1:
The patent transitions from a conventional radial air gap motor configuration to an axial air gap motor configuration. In this design, the stator salient poles and rotor salient poles are arranged axially rather than radially, allowing magnetic flux to pass through the axial air gap. This dimensional change enables high output without requiring large radial dimensions, as the magnetic path is optimized through the axial direction where space can be more efficiently utilized.
Solution Approach 2:
The motor is divided into multiple stator salient poles and rotor salient poles arranged in the axial direction. Each pole pair contributes to the total output, allowing the motor to achieve high power through multiple segmented magnetic circuits rather than requiring a single large coil. This segmentation enables distributed winding arrangements that improve space utilization while maintaining high current capacity.
2Power
If the stator and rotor diameter is increased to accommodate large winding coils, then high output can be achieved, but the occupancy rate of the winding coil decreases
Solution Approach 1:
By switching to axial air gap configuration, the patent reorganizes the winding coil arrangement from a radial distribution to an axial distribution. This allows the winding coils to be positioned more densely in the axial direction, increasing the occupancy rate. The axial arrangement enables better utilization of the available space within the stator and rotor assemblies, fitting more conductive material into the magnetic circuit path.
3Power
If the stator and rotor diameter is increased, then high output can be achieved, but mechanical strength decreases
Solution Approach 1:
The axial air gap configuration concentrates the magnetic forces and mechanical stresses along the axial direction rather than distributing them radially. This allows the stator and rotor to maintain smaller radial dimensions while achieving high output, thereby preserving mechanical strength. The compact radial size reduces centrifugal forces and bending moments, improving overall structural integrity despite the high power output.
4Power
If the stator and rotor diameter is increased, then high output can be achieved, but cooling efficiency becomes difficult to improve due to the closed space nature
Solution Approach 1:
The axial air gap design provides natural pathways for heat dissipation along the axial direction. The stator and rotor assemblies can be designed with cooling channels or heat sinks extending axially, taking advantage of the linear configuration. This dimensional arrangement facilitates better thermal management compared to compact radial designs, as heat can be conducted axially to external cooling surfaces more effectively.
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
The design achieves high output and compact size by maximizing winding coil occupancy, improving mechanical strength, and enhancing cooling efficiency, suitable for high-output applications like electric vehicle engines.
Implementation Method 1
when the stator salient pole 1111 is excited by a winding coil 112 formed on an inner surface
Implementation Method 2
reciprocate along the direction of the central axis of the stator 11 by the force attracted to the excited stator salient pole 1111
Implementation Method 3
a crank mechanism 2 comprising a crank shaft 21 with a crank arm 211 and a connecting rod 22 configured to connect between the mover 12 and the crank arm 211 to convert the reciprocating movement of the mover 12 into the rotational movement of the crank shaft 21
Data Source
AI summary
The present invention relates to a reciprocating switched reluctance motor-driven engine in which a crank shaft is rotated by the switched reluctance motor and which is configured to reciprocate according to the reluctance torque generation principle of the switched reluctance motor. More specifically, an SRM module (1) is composed of: a cylindrical stator (11) obtained by coupling two stator cores (111) which have, on the inner surfaces, stator salient poles (1111) that are excited by winding coils (112); and a mover (12) which has mover salient poles (1211) formed on the outer surface and can reciprocate inside the stator (11). The mover (12) is coupled to a crank mechanism (2) for converting the reciprocating motion of the mover (12) into rotational motion, and rotational force is output from the crank mechanism (2) by the mover (12) which is reciprocated by alternatingly exciting the two stator cores (111).