51. Using Volt-Second Sensing to Directly Improve Torque Accuracy and Self-Sensing at Low Speeds.
- Author
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Wang, Yukai, Xu, Yang, Niimura, Naoto, Rudolph, Benjamin D., and Lorenz, Robert D.
- Subjects
- *
ELECTRIC potential , *POTENTIAL energy , *ELECTRIC inverters , *NONLINEAR theories , *PARAMETER estimation - Abstract
As a result of dead-time, device
on -state voltage drop, dc bus voltage measurement error, etc., volt-second errors degrade precise control of torque and flux linkage, particularly at low speeds. This is true for deadbeat-direct torque and flux control, which directly manipulates the volt-second vector sourced by inverters, as well as for indirect field oriented control drives. This paper introduces a real-time sensing scheme to measure the motor terminal volt-second vectors for each switching period with negligible phase lag. Based on the volt-second sensing, a model reference adaptive system-based approach is developed to decouple the volt-second errors from inverter nonlinearity, and dc bus voltage fluctuation and measurement error. By delivering an accurate volt-second vector for each switching period, torque and flux control accuracy, self-sensing performance, and parameter estimation accuracy are significantly enhanced. [ABSTRACT FROM AUTHOR]- Published
- 2017
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