Resolver Signal Phase Compensation Using Pre-Measured Delay Tables
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Solution Overview
Problem
Existing methods for compensating for the phase delay of resolver signals in AC motor systems require excessive manpower and time, as they necessitate measuring the delay time for each vehicle, which is inefficient.
Innovation Solution
An apparatus and method that calculate the delay time of the resolver signal with respect to the command signal and compensate the command signal accordingly, synchronizing the phases of the command and resolver signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delay time is measured for each vehicle after manufacturing, then compensation accuracy is improved, but productivity deteriorates due to excessive manpower and time requirements
Solution Approach 1:
The patent creates a lookup table that stores delay time values for different resolver types, serving as a copy or representation of the actual delay characteristics. Instead of measuring each individual vehicle, the system uses pre-measured data from representative samples to compensate for delay in production, thereby improving productivity while maintaining adequate compensation accuracy
Solution Approach 2:
The patent performs delay time measurements in advance during the resolver manufacturing or testing phase, and stores these results in a lookup table. This preliminary action allows the production system to use pre-computed compensation values without performing time-consuming measurements on each vehicle, thus resolving the contradiction between measurement accuracy and productivity
2Manufacturing precision
If delay time is measured for each vehicle, then manufacturing precision is improved, but loss of time increases due to extended compensation process
Solution Approach 1:
The patent uses a lookup table that contains pre-measured delay time characteristics for different resolver types. This copy of measurement data allows the system to achieve manufacturing precision equivalent to individual measurements without actually performing time-consuming measurements on each vehicle during production
Solution Approach 2:
Delay time measurements are performed in advance during resolver manufacturing or characterization, and the results are stored for later use. This preliminary action eliminates the need for time-consuming measurements during vehicle assembly, thereby reducing loss of time while maintaining manufacturing precision
3Measurement precision
If manual measurement process is used, then measurement accuracy is improved, but device complexity increases due to additional measurement equipment and procedures
Solution Approach 1:
The patent replaces complex manual measurement equipment and procedures with a simple lookup table containing pre-measured delay characteristics. This copy of measurement data can be accessed through basic microcomputer operations, significantly reducing device complexity while maintaining the ability to achieve accurate compensation
Solution Approach 2:
The system automatically retrieves delay time values from the lookup table based on resolver type identification, eliminating the need for complex manual measurement procedures. The microcomputer performs self-service by automatically selecting and applying the appropriate compensation value without requiring additional measurement equipment or complex operational procedures
Data Source
AI summary
Disclosed are an apparatus and a method for compensating for a phase delay of a resolver signal. The apparatus includes an input/output interface, and a processor connected to the input/output interface, wherein the processor receives a command signal and the resolver signal through the input/output interface, calculates a delay time of the resolver signal with respect to the command signal based on the command signal and the resolver signal, calculates a compensation time based on the delay time, and compensates the command signal based on the compensation time.