H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/99
H02P 7/28 (2006.01)
Patent
CA 1309454
A B S T R A C T It is foreseen to measure the rotational speed (v) of a motor (4) by measuring the electromotive force (e.m.f.). This e.m.f. is calculated as the difference between the terminal voltage (Va) and the voltage drop at a reference resistor (5), through which the armature current flows, then this value is used as a velocity feedback signal for motor regulation. Particularly, the terminal voltage (Va) is cyclically measured at two successive close instants (t1, t2), during which the armature resistance (Ri) and the motor e.m.f. can be considered constant; these terminal voltage values (vat1, Vat2) are stored, then elaborated to perform the actual armature assistance (Ri) during that interval (t1-t2), then this value is multiplied for the instant current (I). The result is then subtracted from the terminal voltage (Va) and only at that time the resulting e.m.f. is used as a velocity feedback signal for the velocity feedback circuit. The apparatus for carrying out this process is also disclosed.
542638
Gowling Lafleur Henderson Llp
Gse Di Venturino Gianfranco
Venturino Gianfranco
LandOfFree
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