Robust Torque Control of Switched-Reluctance Motors Without a Shaft-Position Sensor
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abstract
A technique is described for stabilizing the operation of variable-reluctance stepping-motor drives operating without a shaft-position sensor. In such systems there is a trade-off between the system efficiency and the torque margin (or pull-out torque) which depends on the width of the phase conduction pulse. The scheme permits the motor to run in the steady state with narrow conduction pulse widths and high efficiency. Under transient or overload conditions the conduction pulse width is increased in response to a change in the dc link current, providing an increase in available torque. Tests on a small motor drive have produced a steady-state torque margin of over 300 % and of 200 % under step-change conditions.