Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1988-06-17
1989-12-19
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318687, 318778, H02P 540
Patent
active
048885436
ABSTRACT:
A drive arrangement is described, comprising a multi-phase synchronous motor whose phase windings are energized with energizing currents whose strengths are periodic functions (f1, f2, f3) of a rotor-position or translator-position measurement value (p) which is determined by means of an incremental detection system. The drive arrangement has means for adjusting the initial position-measurement value (p) before the motor is energized with the periodic energizing currents. For determining the initial value, the phase windings are energized in different consecutive time intervals (T) with measurement alternating currents (im1, im2, im3) whose amplitudes are equal to K times the function values (f1, (ROPOS), f2(ROPOS), f3(ROPOS)) of the periodic functions (f1, f2, f3) associated with different auxiliary values (ROPOS). The frequency and amplitudes are selected in such a way that the rotor or translator performs a vibration whose vibration amplitude corresponds to only a few electrical degrees. The auxiliary value (ROPOS) is determined for which the ratio between the amplitude and the value of K is maximal and, subsequently, the initial position-measurement value (p) is adjusted to this optimum value, so that the initial value is adjusted to a value for which the force produced by the energizing currents is maximal.
REFERENCES:
patent: 3909688 (1975-09-01), Blaschke et al.
patent: 4390827 (1983-06-01), Imahashi
patent: 4590411 (1986-05-01), Kelly
patent: 4746850 (1988-05-01), Abbondanti
patent: 4764712 (1988-08-01), Blaschke et al.
Smith Jr. David
U.S. Philips Corporation
Wieghaus Brian J.
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