Electric Machine Torque Control Using Integer Pulse Waveform Cycles
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Solution Overview
Problem
Conventional methods for controlling electric machines under pulsed operation often result in inaccurate torque values due to averaging or sampling methods that are not aligned with the pulsing waveform, leading to inefficiencies and potential safety issues.
Innovation Solution
Implementing a control strategy that averages torque output over integer multiples of the pulsed waveform cycle, allowing for accurate and responsive torque delivery by alternating between 'torque on' and 'low torque' states, thereby improving energy conversion efficiency and reducing inaccuracies in torque estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional averaging or digital filter methods are used to determine torque output during pulsed operation, then the torque measurement can be obtained continuously, but the torque values become inaccurate due to misalignment with the pulsing waveform
Solution Approach 1:
The patent applies periodic action by synchronizing the torque averaging period with the pulsing waveform cycle. Instead of using continuous averaging or digital filters that are misaligned with the pulsed operation, the system calculates torque averages over complete cycles of the pulsing waveform, ensuring that each measurement period corresponds exactly to one or more full waveform cycles. This synchronization eliminates the inconsistency between the measurement method and the pulsed operation, providing accurate and reliable torque values throughout the pulsed operation.
2Adaptability or versatility
If the electric machine operates continuously under varying load conditions, then it can meet diverse application requirements, but the energy conversion efficiency drops when operating away from the most efficient load point
Solution Approach 1:
The patent implements periodic action by transitioning the electric machine from continuous operation to pulsed operation. The machine alternates between active torque-producing phases and idle phases, with each active phase optimized to operate at or near the most efficient load point. By controlling the duty cycle of these pulses, the system can meet varying load requirements over time while ensuring that during active operation, the machine operates efficiently, thus reducing energy losses compared to continuous operation at varying loads.
Solution Approach 2:
The patent applies dynamics by making the machine operation adaptive and variable rather than static and continuous. The pulsed operation allows the system to dynamically adjust between active and idle states, optimizing the operating point during active phases while maintaining the ability to respond to changing load demands. This dynamic approach enables the machine to operate at peak efficiency during active periods while meeting diverse application requirements through temporal variation in operation.
3Loss of energy
If pulsed operation is implemented to improve energy conversion efficiency, then the machine can operate closer to its most efficient point, but inaccurate torque measurement methods lead to inconsistent results and potential safety issues
Solution Approach 1:
The patent resolves this contradiction by implementing periodic action through synchronized torque measurement. The system measures torque over complete cycles of the pulsing waveform, ensuring that each measurement period aligns perfectly with the active and idle phases. This synchronization provides accurate and consistent torque values throughout pulsed operation, enabling the system to safely and reliably operate in pulsed mode while maintaining high energy conversion efficiency. The accurate torque measurements eliminate the inconsistency and safety concerns that would otherwise result from using conventional averaging methods during pulsed operation.
Data Source
AI summary
Methods, systems, and devices for electric machine torque adjustment based on waveform integer multiples are disclosed herein. One electric machine controller arranged to direct pulsed operation of an electric machine includes utilizing a pulse controller that calculates an average torque based upon a time period that corresponds with an integer multiple of a waveform cycle of a pulse waveform.