Resolver Pulse Signal Generation for Two-Phase Motor Angle Feedback
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Solution Overview
Problem
Existing angle detection devices using resolvers output angle data instead of two-phase pulse signals, making it incompatible with motor control devices that rely on pulse signals for motor control.
Innovation Solution
A pulse signal generator that compensates for deviations between rotor angle information and feedback information by generating a counter pulse with sign information, which is used to create two-phase pulse signals representing the rotation angle, enabling conversion of angle data into compatible pulse signals for motor control devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If angle detection devices output angle data instead of two-phase pulse signals, then the device complexity is reduced and processing is simplified, but compatibility with motor control devices that require pulse signals is lost
Solution Approach 1:
The patent introduces a pulse signal generation unit as an intermediary component that converts angle data into two-phase pulse signals. This mediator enables compatibility with motor control devices without changing the core angle detection functionality, thus resolving the contradiction between simplified processing and compatibility requirements.
Solution Approach 2:
The angle detection device is enhanced with multi-functionality by adding the pulse signal generation capability to the existing angle data output function. This allows the same device to serve both applications: providing simplified angle data processing and generating compatible pulse signals for traditional motor control devices.
2Adaptability or versatility
If two-phase pulse signals are generated from angle data, then compatibility with motor control devices is achieved, but additional processing units and complexity are introduced
Solution Approach 1:
The patent merges the pulse signal generation function with the existing angle detection processing units. By integrating the pulse generation logic into the same hardware that processes angle data, the system achieves compatibility functionality without adding completely separate processing units, thus minimizing the increase in device complexity.
Solution Approach 2:
The angle detection device performs self-service by generating the required pulse signals internally using its own processing resources. The device uses its existing computational capabilities to convert angle data into pulse signals without requiring external conversion equipment, thereby adding compatibility functionality with minimal additional complexity.
3Measurement precision
If compensation processing is performed to correct deviations in angle information, then measurement precision is improved, but processing time and complexity increase
Solution Approach 1:
The patent implements preliminary compensation actions by pre-calculating and storing compensation values in a lookup table based on temperature conditions. When temperature deviation occurs, the system quickly retrieves and applies the pre-computed compensation value, avoiding time-consuming real-time calculations and minimizing processing time while maintaining measurement precision.
Solution Approach 2:
The compensation mechanism dynamically adjusts the angle information parameter based on temperature changes. By monitoring temperature and applying appropriate compensation offsets, the system maintains high measurement precision across varying thermal conditions without requiring complex real-time processing, thus balancing precision with processing efficiency.
Data Source
AI summary
A pulse signal generator suitable for generating a two-phase pulse signal required as information of a rotation angle of a motor from a motor control device is provided. According to an embodiment, the pulse signal generator includes: a compensation unit that outputs a compensation signal for compensating for the deviation between the angle information representing the rotation angle of the rotor provided in the resolver and the fed back angle information; a counter pulse output unit that outputs a counter pulse having a frequency corresponding to the compensation amount of the compensation signal and code information representing the sign of the compensation signal, and a pulse processing unit that outputs a count value by a counter as the angle information, which counts the pulse according to the code information, the pulse processing unit generating two-phase pulse signals PA and PB using the values of the counter.