Variable Reluctance Resolver Rotor Trapezoidal Protrusions
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Solution Overview
Problem
Variable reluctance resolvers face challenges in enhancing performance and reducing costs while maintaining output voltage, as existing designs with elliptical or multiple pole rotators exhibit low output voltage and require structural improvements.
Innovation Solution
A variable reluctance resolver design featuring a rotor with alternately formed trapezoidal protrusion portions and flat surfaces on its outer peripheral surface, where the protrusion lengths exceed those of the flat surfaces, and inclined surfaces are set between 90 to 145 degrees, enhancing voltage transformation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor is designed with conventional elliptical or multiple pole shapes, then the structure is simple to manufacture, but the output voltage is low
Solution Approach 1:
The patent applies parameter changes by modifying the rotor shape parameters - specifically creating trapezoidal protrusions with optimized dimensions (circumferential length, radial height, and inclination angles between 90-145 degrees). This geometric parameter optimization increases the magnetic flux variation during rotation, thereby enhancing the induced output voltage without fundamentally changing the resolver's operational principle or manufacturing process
Solution Approach 2:
The patent employs asymmetry by designing the rotor with trapezoidal protrusions that have unequal circumferential lengths compared to the flat surfaces, and inclined surfaces with specific angles (90-145 degrees). This asymmetric geometry creates more effective magnetic flux paths and variation during rotation, improving voltage transformation ratio while maintaining rotational symmetry for balanced operation
2Power
If the stator winding turns and laminated steel plates are increased to improve output voltage, then the output voltage increases, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent changes the rotor geometric parameters (protrusion shape, size, and angle) to optimize magnetic flux interaction. This parameter optimization enhances the voltage transformation ratio inherently, allowing the system to achieve higher output voltage without increasing stator winding turns or laminated steel plate count, thereby reducing manufacturing cost and complexity
3Power
If the rotor protrusion circumferential length is increased to improve voltage transformation, then the output voltage increases, but the rotor circumference length increases
Solution Approach 1:
The patent applies local quality by concentrating the magnetic flux interaction in specific localized regions - the trapezoidal protrusions with inclined surfaces. These localized geometric features create intense flux variation during rotation, achieving high voltage transformation ratio without requiring the entire rotor circumference to be enlarged. The flat surfaces between protrusions provide spacing and magnetic path completion without contributing to excessive circumference
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 significantly increases output voltage by modifying the rotor shape, allowing for a reduction in stator winding turns and laminated steel plates under the same output conditions, achieving a 35% improvement in voltage transformation ratio.
Implementation Method 1
A variable reluctance resolver comprises a stator which receives a field winding and an output winding in a plurality of slots formed in an annular inner peripheral surface and a rotor which is disposed to have a predetermined clearance from the inner peripheral surface of the stator
Implementation Method 2
the rotor is alternately formed with protrusion portions and circumferentially flat surfaces, which protrusion portions are trapezoidal when viewed in radial cross-section of the rotor
Data Source
AI summary
The present invention relates to a resolver of an electric driving motor for vehicle which comprises a rotor, a stator comprising a stator main body which encircles the rotor and teeth which extend from the stator main body to be wound by a coil, a terminal module comprising a terminal end which contacts the coil for an electric connection and a terminal main body which supports the terminal end, and a connector module comprising a connector main body which is detachably coupled to the terminal main body and a lead line which is connected to an outer device and supported by the connector main body and which contacts the terminal end for an electric connection if the connector main body is coupled to the terminal main body, thus simplifying manufacturing process and repairing process and reducing cost.