Motor Resolver Diagnosis Circuit for New Energy Vehicle Safety
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Solution Overview
Problem
Existing motor diagnosis systems in new energy vehicles have low accuracy, which reduces the reliability of subsequent safety control processes.
Innovation Solution
A device and system for diagnosing motor parameters, comprising a master chip, an excitation conditioning circuit, a motor resolver unit, and a sine and cosine conditioning circuit, which processes sine and cosine analog signals to calculate and diagnose motor angles, thereby improving diagnosis accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an integrated chip is used to acquire and diagnose motor position, then the diagnosis process is simple, but the diagnosis accuracy is low
Solution Approach 1:
The patent divides the motor position diagnosis system into separate functional modules: an excitation conditioning circuit for signal generation, a motor resolver unit for signal processing, a sine and cosine conditioning circuit for signal conditioning, and a master chip for analog-to-digital conversion and calculation. This segmentation allows each module to be optimized for its specific function, improving overall diagnosis accuracy while maintaining operational simplicity through modular design.
2Ease of operation
If a simple diagnosis process is used, then the system is easy to operate, but the reliability of subsequent safety control is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the monitoring core continuously receives digital signals from the motor resolver unit and performs real-time diagnosis. The system calculates motor angles based on sine and cosine signals and feeds this information back to the controller, enabling continuous monitoring and verification of motor position, thereby improving safety control reliability.
Solution Approach 2:
The patent introduces an intermediary monitoring core that acts as a mediator between the motor resolver unit and the controller. This monitoring core performs dedicated diagnosis functions, processing sine and cosine digital signals to determine motor angles and detect abnormalities, thereby enhancing the reliability of safety control without complicating the overall system operation.
3Measurement precision
If separate calculation and diagnosis of motor angle are performed, then the diagnosis accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into an integrated master chip that performs analog-to-digital conversion, sine and cosine signal processing, motor angle calculation, and diagnosis functions. By merging these functions into a single chip, the system achieves high diagnosis accuracy through separate calculation and diagnosis processes while minimizing device complexity through integration.
Data Source
AI summary
A device and a system for diagnosing a motor parameter are provided. The device includes a master chip, an excitation conditioning circuit, a motor resolver unit, and a sine and cosine conditioning circuit. The master chip includes a first analog-to-digital converter, a second analog-to-digital converter, a first processing unit, and a monitoring core.