Resolver Signal Converter Phase Shifter Design
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Solution Overview
Problem
Existing signal converters for resolvers experience significant errors in detected angle due to deviations in phase shift from 90°, and require complex configurations with large circuit sizes, leading to inadequate accuracy and size efficiency.
Innovation Solution
A signal converter design that uses two phase shifters with poles f1 and f2, where f1 < fc < f2, to maintain a constant 90-degree phase difference, even with varying rotor rotation speeds, thereby enhancing detected-angle accuracy and reducing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single phase shifter is used to shift the phase of resolver signals, then the circuit size is reduced, but the phase difference deviates from 90° when the carrier frequency varies, causing large errors in detected angle
Solution Approach 1:
The phase shifting function is divided into two separate phase shifters instead of using one complex phase shifter. Each phase shifter has a specific pole frequency (f1 and f2) that satisfies a particular relationship, allowing them to work together to maintain a constant 90° phase difference across frequency variations. This segmentation enables the system to achieve both accuracy and simplicity.
Solution Approach 2:
The invention changes the parameters of the phase shifters by setting their pole frequencies (f1 and f2) to satisfy a specific relationship. This parameter configuration allows the phase shifters to compensate for frequency variations in the carrier signal, maintaining a constant phase difference of 90° and thereby improving detected-angle accuracy without increasing circuit complexity.
2Measurement precision
If the pole frequencies of the two phase shifters are set to satisfy a specific relationship, then the phase difference remains constant at 90° despite frequency variations, but the design becomes more complex
Solution Approach 1:
The invention specifies a particular relationship between the pole frequencies f1 and f2 of the two phase shifters. This parameter configuration enables the phase shifters to maintain a constant 90° phase difference even when the carrier frequency varies due to rotor speed fluctuations. The specific parameter relationship is designed to achieve frequency compensation, resolving the contradiction between measurement precision and design complexity.
3Device complexity
If conventional phase shifting methods are used, then the circuit implementation is simple, but large errors occur in the detected angle when the rotor rotates
Solution Approach 1:
The phase shifting function is divided into two separate phase shifters with specific pole frequencies. This segmentation allows the system to maintain a constant 90° phase difference across frequency variations, thereby improving detected-angle accuracy. The two-phase-shifter configuration achieves better precision while keeping the circuit implementation relatively simple and avoiding the need for complex feedback mechanisms.
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 solution provides accurate angle detection with reduced circuit complexity and size, maintaining a stable phase difference of 90° across varying frequencies, thus improving the precision and efficiency of the signal conversion process.
Implementation Method 1
a signal converter that shifts a phase of one of two-phase outputs of a resolver having a carrier frequency fc by an amount φ1 by using a phase shifter having a pole f1, shifts a phase of the other of the two-phase outputs by an amount φ2 by using a phase shifter having a pole f2
Data Source
AI summary
A signal converter 100 includes, for at least two-phase signals detected by a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifter 101 that shifts a phase of a first phase signal of the resolver with a pole at a frequency f1 lower than the carrier frequency fc, a second phase shifter 102 that shifts a phase of a second phase signal of the resolver with a pole at a frequency f2 higher than the carrier frequency fc, and a synthesizer 103 that combines the phase-shifted first phase signal with the phase-shifted second phase signal.