Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1995-01-20
1997-08-19
Masih, Karen
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318569, 318600, H02P 800
Patent
active
056592345
ABSTRACT:
A method is disclosed for the reduction of vibrations in a system using a stepping motor, driving parts at a constant velocity. On a test rig, the dynamic behaviour of the stepping motor in micro stepping mode is measured by a system comprising a rotation encoder. The measured data are filtered and used to compensate the unwanted speed fluctuations. In a first method, compensation is done by modification of the theoretical current-vector angles of basic micro stepping, while keeping the current-vector length constant. In a second method, first the current-vector angles are optimized, where after the current-vector lengths are optimized to correct the stepping motor for a wide range of speeds and load torques. In both methods, the stepping frequency is constant over all steps and determined by the desired angular speed of the stepping motor.
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patent: 4980617 (1990-12-01), Tajima et al.
patent: 5218283 (1993-06-01), Wills et al.
AGFA Gevaert, N.V.
Masih Karen
Merecki John A.
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