Reluctance Resolver Design with Integer Teeth Ratios
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Solution Overview
Problem
Conventional reluctance resolvers face precision issues in calculating the position of the motor rotor due to fixed but non-integer phase angles between the stator and rotor teeth, leading to errors in maintaining the magnetic field alignment and efficiency.
Innovation Solution
A method is introduced to fix the relative position and calculate the turn ratio of the stator by using integer phase angles, allowing precise winding of coils around the stator teeth, thereby improving the accuracy of motor rotor position calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of teeth of the stator and rotor is fixed based on resolution, then the structure is simplified, but the phase angles become non-integer values causing calculation errors in motor rotor position
Solution Approach 1:
The patent changes the parameter of teeth number ratio from arbitrary values to specific integer ratios (such as 5:6, 6:5, 4:5, 5:4). This parameter change ensures that phase angles become integer multiples of 360 degrees divided by the teeth number, eliminating calculation errors while maintaining structural simplicity.
Solution Approach 2:
Instead of fixing the number of teeth first and calculating phase angles (which leads to non-integer values), the patent inverts the approach by first determining integer teeth number ratios and then deriving phase angles from these ratios. This inversion ensures that phase angles are always integer values, solving the precision problem.
2Ease of manufacture
If conventional fixed teeth numbers are used, then manufacturing is easier, but the sine and cosine waveforms are distorted leading to position calculation errors
Solution Approach 1:
The patent specifies particular teeth number ratios (5:6, 6:5, 4:5, 5:4) that satisfy both manufacturing ease and waveform accuracy. These specific parameter values ensure that the magnetic field distribution generates accurate sine and cosine waveforms while remaining easy to manufacture with standard teeth configurations.
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 method enhances the accuracy of signal output and precision in calculating the motor rotor position, facilitating improved efficiency and precision control in industrial applications.
Implementation Method 1
the coils of the motor stator can be triggered to allow the magnetic field of the motor stator and that of the motor rotor to be maintained in a vertical position to each other
Implementation Method 2
a method of designing a reluctance resolver
Data Source
AI summary
A method of designing a reluctance resolver, and the resolver comprises a stator and a rotor, and an exciting coil and two sets of outputting wires wind around the tooth portion of the stator. The designing method comprises the following steps: fixing relative position; calculating the turn ratio of the stator; winding the coil of the stator; and designing the resolver. And the resultant resolver can improve the precision of calculating the position of the motor rotor.