Resolver Arrangement Using Non-Equidistant Magnetic Poles
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Solution Overview
Problem
Existing resolver technologies face difficulties in increasing resolution without complicating coil winding and commutation circuits, and are restricted by equidistant magnetic pole arrangements, which limit application and increase production time.
Innovation Solution
The method involves arranging stator magnetic poles as integral multiples of a phase number and calculating rotor magnetic poles using a specific formula to produce signals with phase differences, allowing for non-equidistant pole arrangements that simplify coil winding and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stator magnetic pole number and rotor magnetic pole number are increased to increase resolution, then the resolution is improved, but the coil winding becomes more difficult
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between stator magnetic pole number (Ns), rotor magnetic pole number (Nr), and phase number (q). The stator magnetic pole number is set as an integral multiple of the phase number (Ns = m × q), and the rotor magnetic pole number is calculated using the formula Nr = (Ns - 2) / (2n - 1). These parameter changes enable high resolution while maintaining manageable coil winding complexity.
2Measurement precision
If the stator magnetic pole number and rotor magnetic pole number are increased to increase resolution, then the resolution is improved, but the commutation circuit becomes more complicated
Solution Approach 1:
The patent uses parameter changes to enable direct conversion to a 2-phase circuit by setting the stator magnetic pole number as an integral multiple of the phase number. This specific parameter relationship allows the resolver output to be directly transformed into 2-phase signals without requiring complex commutation circuits, thereby achieving high resolution while keeping the commutation circuit simple.
3Stability of the object's composition
If the equidistant arrangement of magnetic poles is used, then the standard arrangement is maintained, but the application is restricted and production time is wasted
Solution Approach 1:
The patent applies asymmetry by deviating from the traditional equidistant arrangement of magnetic poles. Instead of uniform spacing, the patent uses non-equidistant arrangements where the angular positions of magnetic poles are determined by specific formulas based on the rotor tooth pitch and buffering intervals. This asymmetric arrangement increases application flexibility and eliminates production time waste while maintaining arrangement stability through mathematical relationships.
4Stability of the object's composition
If the equidistant arrangement of magnetic poles is used, then the standard arrangement is maintained, but the production time is increased
Solution Approach 1:
The patent applies parameter changes by establishing specific relationships between magnetic pole numbers, phase numbers, and angular positions. The stator magnetic pole number is set as an integral multiple of the phase number, and the rotor magnetic pole number is calculated using a specific formula. These parameter changes enable more efficient production processes while maintaining arrangement stability, thereby reducing production time.
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 approach enables easier coil winding, reduces production costs, allows direct conversion to a 2-phase circuit, and increases resolution by optimizing stator and rotor magnetic pole configurations, while eliminating low harmonic waves and simplifying the resolver structure.
Implementation Method 1
The working principle of a rotary motor is that the current flows to the stator via a transistor 3-phase inverter and a pulse width modulator (PWM), producing a rotating magnetic field, and then the rotating magnetic field will interact with the permanent magnet of the rotor and generate a torque.
Implementation Method 2
the rotating magnetic field will interact with the permanent magnet of the rotor and generate a torque
Data Source
AI summary
A method of arranging a resolver comprises the steps of: a, setting stator magnetic poles number of the resolver Ns as a number being in integral multiples (t) of a phase number q; b, figuring out rotor magnetic pole number Nr based on a formula; c, arranging the stator and the rotor based on the stator magnetic poles number of the resolver Ns and the rotor magnetic pole number Nr, and producing signals with phase differences.