996 research outputs found
Controller for computer control of brushless dc motors
A motor speed and torque controller for brushless d.c. motors provides an unusually smooth torque control arrangement. The controller provides a means for controlling a current waveform in each winding of a brushless dc motor by synchronization of an excitation pulse train from a programmable oscillator. Sensing of torque for synchronization is provided by a light beam chopper mounted on the motor rotor shaft. Speed and duty cycle are independently controlled by controlling the frequency and pulse width output of the programmable oscillator. A means is also provided so that current transitions from one motor winding to another is effected without abrupt changes in output torque
Proof of the renormalizability of the gradient flow
We give an alternative perturbative proof of the renormalizability of the
system defined by the gradient flow and the fermion flow in vector-like gauge
theories.Comment: 29 pages, the final version to appear in Nuclear Physics
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