Electric Machine Torque Control Using Waveform-Cycle Averaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric machine control methods for pulsed operation often result in inaccurate torque measurements due to continuous averaging techniques, leading to inefficiencies and potential safety issues when operating under varying load conditions.
Innovation Solution
Implementing a control strategy that averages pulsed outputs at multiples of the pulsed waveform cycle, using pulse width or density modulation to adjust torque delivery, ensuring accurate and responsive torque control while optimizing energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous averaging or digital filtering methods are used to determine torque output, then the torque measurement appears smooth and continuous, but the results become inaccurate and inconsistent under pulsed operation conditions
Solution Approach 1:
The patent applies periodic action by synchronizing the torque measurement averaging window with the pulsed operation waveform cycle. Instead of using continuous averaging or fixed digital filters, the system calculates torque averages over periods that are integer multiples of the pulse waveform cycle, ensuring that each measurement period captures complete pulse cycles and yields consistent, accurate results under pulsed conditions.
2Adaptability or versatility
If the electric machine operates under varying load conditions, then the machine can adapt to different application requirements, but the energy conversion efficiency drops when operating away from the most efficient load point
Solution Approach 1:
The patent implements dynamics by enabling the electric machine to operate in pulsed mode, dynamically switching between active torque production and idle states. This allows the machine to adapt to varying load requirements while maintaining high efficiency during active periods, as the pulsed operation keeps the machine at or near its most efficient operating point during torque delivery, rather than operating continuously at suboptimal loads.
Data Source
AI summary
Methods, systems, and devices for electric machine torque adjustment based on waveform multiples are disclosed herein. One electric machine controller, arranged to direct pulsed operation of an electric machine, utilizes a pulse controller that calculates a first average measured torque from sensed torque values over a first time period and a second average measured torque from sensed torque values over a second time period, wherein the first and second time periods are different time periods.