Resolver Positioning Signal Interface Without Separate Polarity Channel
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Solution Overview
Problem
Existing electric drive systems require multiple resolvers for each converter, increasing costs and complicating product portfolio management, as they rely on separate signaling channels for polarity information transfer.
Innovation Solution
A positioning device that generates a position signal based on alternating signal amplitudes and polarity information, eliminating the need for separate signaling channels by incorporating polarity indicators within the alternating signals, and an excitation device that modulates the excitation signal to include polarity information, allowing a single resolver to serve multiple converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple resolvers are used for each converter, then rotational position detection reliability is improved, but system cost and device complexity increase
Solution Approach 1:
The patent implements a single resolver that can be shared by multiple converters, where the resolver serves universal functionality for rotational position detection across different converters. The signal interface enables this single resolver to provide position information to multiple converters through proper signal distribution and polarity management, eliminating the need for separate resolvers for each converter while maintaining detection reliability.
Solution Approach 2:
The patent combines multiple rotational position detection functions into a single resolver unit. By merging the resolver resources and using a shared signal interface with polarity indication mechanisms, the system achieves reliable position detection for multiple converters without requiring multiple separate resolver installations, thus reducing overall system complexity.
2Loss of information
If separate signaling channels are used for polarity information transfer, then information transfer accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the polarity information transfer with the existing alternating signal transmission channel. The polarity information is encoded within the alternating signals themselves rather than requiring separate dedicated signaling channels. This integration is achieved through the signal interface that processes both position and polarity information through the same resolver connection, reducing device complexity while maintaining information accuracy.
Solution Approach 2:
The alternating signal channel serves dual functionality: it simultaneously transmits both rotational position information and polarity information. The signal interface is designed to extract both types of information from the same signal stream, making the signaling channel universal and eliminating the need for separate dedicated polarity channels, thus reducing system complexity.
3Device complexity
If a single resolver is used for multiple converters, then cost and device complexity are reduced, but adaptability and compatibility among converters become more challenging
Solution Approach 1:
The patent introduces a signal interface as an intermediary component between the single shared resolver and multiple converters. This signal interface acts as a mediator that manages the interaction between the resolver and different converters, handling signal distribution, polarity indication, and information extraction. The intermediary enables the single resolver to adaptively serve multiple converters with different requirements, maintaining converter compatibility while reducing overall system complexity.
Data Source
AI summary
A positioning device (101) for producing a position signal indicative of a rotational position of a resolver is disclosed. The positioning device includes a signal interface (102) for receiving alternating signals (V_cos, V_sin) from the resolver and a processing system (103) for generating the position signal based on position-dependent amplitudes of the alternating signals and on polarity information indicative of a polarity of an excitation signal (V_exc) of the resolver. The processing system is configured to recognize a polarity indicator, such as a change of frequency or phase, on a waveform of one or both of the alternating signals and to determine the polarity information based on the recognized polarity indicator. Thus, the polarity information related to the excitation signal is included in the alternating signals and therefore there is no need for a separate signaling channel for transferring the polarity information to the positioning device.