Method for operating an electronically commutated synchronous machine, and actuation circuit

a technology of synchronous machine and actuation circuit, which is applied in the direction of electrical apparatus, control system, ac motor control, etc., can solve the problems of inability to measure the current of the phase, inability to use a single shunt, and inability to operate an electronically commutated synchronous machine, etc., and achieve the effect of expanding the measurement region
US20210167714A1Active Publication Date: 2021-06-03CONTINENTAL TEVES AG & CO OHG
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
CONTINENTAL TEVES AG & CO OHG
Publication Date
2021-06-03

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Abstract

A method for operating an electronically commutated synchronous machine with several phases, wherein an actuation circuit operates the synchronous machine, the actuation circuit having at least two switches for each phase and a degree of actuation for each phase being periodically ascertained by the actuation circuit, wherein the switch-on period, during which a supply voltage is applied to the respective phase by way of the associated switch, is determined for ascertaining the degree of actuation, wherein the following steps are carried out: measuring current by a single measurement resistor in at least two measurement windows and shifting one or more of the switch-on periods of the different phases relative to one another as soon as the difference between switch-on instants of at least two phases falls below a minimum period or the difference between the switch-on periods of at least two phases falls below twice the minimum period.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is the U.S. National Phase Application of PCT International Application No. PCT / DE2017 / 078414, filed Nov. 7, 2017, which claims priority to German Patent Application Ser. No. 10 2017 211 196.8, filed Jun. 30, 2017, and European Patent Application No. 16198509 filed Nov. 11, 2016 the contents of such applications being incorporated by reference herein.FIELD OF THE INVENTION

[0002] The invention relates to a method for operating an electronically commutated synchronous machine, and also to an actuation circuit.BACKGROUND OF THE INVENTION

[0003] Electronically commutated synchronous machines with permanent excitation, also known as brushless motors, have a stator with at least two, in particular three, phase windings and a rotor with at least one pole pair which is arranged perpendicularly to the rotation axis and is formed by one or more permanent magnets which are arranged in or on the rotor. A brushless motor is supplied with...

Claims

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