Resolver Management Device Delay Time Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing resolver systems face challenges in accurately measuring delay times in alternating current motor control systems, particularly in hybrid electric vehicles, due to limitations in precise location control and frequent variable speed changes.
Innovation Solution
A resolver management device and system that generates and receives excitation signals, detects delay times using internal clocks, and transmits count values to a microcontroller unit (MCU) for precise delay measurement, incorporating a method that includes generating a square-wave signal and converting it to a sine-wave signal for accurate detection of delay times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resolver system is used to measure rotor location in alternating current motor control, then location information can be obtained for motor control, but delay time measurement precision is insufficient due to system limitations
Solution Approach 1:
The patent segments the delay time measurement into two distinct parts: a first delay time from the external control signal to the excitation signal, and a second delay time from the excitation signal to the reflected excitation signal. By measuring these segments separately and compensating for them individually, the system achieves higher overall measurement precision while maintaining resolver system reliability.
2Adaptability or versatility
If variable speed changes are implemented in the motor control system, then motor adaptability is improved, but delay time measurement accuracy deteriorates
Solution Approach 1:
The patent employs periodic excitation signals with specific frequencies to measure delay times at different operating conditions. By using periodic measurements and comparing delay times across different speed points, the system maintains measurement accuracy even when the motor operates with variable speed changes, thus supporting motor adaptability without sacrificing precision.
3Manufacturing precision
If the resolver management device measures delay time using the excitation signal, then delay compensation can be achieved, but the complexity of the device increases
Solution Approach 1:
The patent introduces an intermediary measurement approach by using the excitation signal as a reference to measure both the first and second delay times. This intermediary signal enables precise delay compensation through mathematical calculation and compensation without requiring complex hardware modifications, thus achieving high manufacturing precision while controlling device complexity.
Data Source
AI summary
A method of operating a resolver management device according to the present invention includes: generating an excitation signal by using an external control signal; counting a time interval (a first delay time) to a first pole of the excitation signal based on one period of the external control signal by using an internal clock; receiving an excitation signal reflected from a resolver sensor; counting a time interval (a second delay time) to a second pole of the reflected excitation signal at the first pole by using the internal clock; and transmitting a first count value corresponding to the first delay time and a second count value corresponding to the second delay time to a microcontroller unit (MCU).