Electricity: measuring and testing – Magnetic – Displacement
Patent
1985-07-17
1987-07-28
Karlsen, Ernest F.
Electricity: measuring and testing
Magnetic
Displacement
318696, 368157, G01B 714, H02P 800, G04F 500, G06F 104
Patent
active
046834281
ABSTRACT:
The method according to the invention is applicable to motors comprising a magnetized rotor having two diametrically opposed poles, a stator making up a magnetic circuit having saturable constricted portions and a coil coupled magnetically to the stator. The method consists in applying to the coil an electric pulse, in measuring a control current (I'.sub.01, I'.sub.02) generated within the coil by the electric pulse at the end of a control time interval (t'.sub.o -t.sub.i) and in comparing the control current with a reference current (I.sub.r), the sign of this comparison being representative of the position of the rotor. In order to take into account the variations in the characteristics of the motor with time, the control time interval (t'.sub.o -t'.sub.i) is readjusted periodically by means of first and second electric pulses of a learning signal applied to the coil. The first pulse of this signal generates within the coil a first current (I.sub.1) which reaches the reference current (I.sub.r) after a first time interval (t.sub.a -t.sub.i). The second pulse generates a second current (I.sub.2) which reaches the reference current (I.sub.r) after a second time interval (t.sub.b -t.sub.i). The mean value of the first and second time intervals is then taken as the value of the control time interval (t'.sub.o -t.sub.i). The device for carrying out this method enables the position of the rotor to be identified under optimal conditions and can be used with advantage in timepieces.
REFERENCES:
patent: 4425538 (1984-01-01), Berney
Asulab S.A.
Karlsen Ernest F.
Snow Walter E.
LandOfFree
Method of and a device for identifying the position of the rotor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and a device for identifying the position of the rotor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and a device for identifying the position of the rotor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2036564