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Patent Searching and Data


Title:
METHOD AND DEVICE FOR PROVIDING INFORMATION ON AN ANNULAR DISPLACEMENT OF A DC ELECTROMOTOR
Document Type and Number:
WIPO Patent Application WO/2019/074370
Kind Code:
A3
Abstract:
Driving an electromotor and a brushed electromotor in particular results in ripples in the supply current. The amount of pulses is proportional to the amount of revolutions of the rotor of the electromotor. With a flawless motor, the amount of pulses is the same with each revolution. Flaws of the electromotor, in brushes, rotor, windings and/or other components, results in fluctuations of pulses in the supply current per revolution of the rotor. By comparing an expected amount of pulses to counted pulses and using various physical parameters of the electromotor, various methods may be employed to correct a counted amount of pulses or otherwise provide an appropriate value representing displacement of the rotor of the electromotor. Criteria are established which determine when a pulse should be counted, e.g. if it occurs at within an expected time period, or if the sum of the product of sampled supply current and supply voltage values corresponds to a predetermined value. Pulses which are The time between counted pulses may also be used for determining slip of a slip coupling comprised by a drive train to which the electromotor may be coupled.

Inventors:
HU, Jinku (3447 GK Woerden, NL)
Application Number:
NL2018/050673
Publication Date:
May 23, 2019
Filing Date:
October 12, 2018
Export Citation:
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Assignee:
MCI (MIRROR CONTROLS INTERNATIONAL NETHERLANDS B.V (Pompmolenlaan 29, 3447 GK Woerden, NL)
International Classes:
G01P3/48; G01P3/489; H02P7/00
Foreign References:
US8169178B22012-05-01
US6144179A2000-11-07
US20080298784A12008-12-04
US20090254300A12009-10-08
US4744041A1988-05-10
Attorney, Agent or Firm:
JANSEN, C.M. (V.O, Carnegieplein 5, 2517 KJ Den Haag, NL)
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