Electricity: measuring and testing – Electrical speed measuring – Including motor current or voltage sensor
Reexamination Certificate
2007-09-04
2007-09-04
Patidar, Jay M. (Department: 2862)
Electricity: measuring and testing
Electrical speed measuring
Including motor current or voltage sensor
C324S163000, C324S166000, C318S254100
Reexamination Certificate
active
10660910
ABSTRACT:
A method and a device for measuring the speed of a pulse-activated electric motor are described. According to this method, the motor is fully activated at time intervals to be determined for a defined measuring time by the circuit element provided for timing and, in this time, the frequency of the current ripples, which is proportional to the motor speed, is measured. A current-proportional voltage measuring device is located on the circuit element, on whose load side are located an amplifier, filters, and an evaluation circuit in the form of a comparator for determining the frequency of the current ripples flowing in a measured phase during which the motor is fully activated.
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Hachtel Juergen
Hertlein Guenther
Micke Marc
Sievert Holger
Kenyon & Kenyon LLP
Patidar Jay M.
Robert & Bosch GmbH
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