Method for actuating a brushless motor
First Claim
1. A method for operating an electronically commutated synchronous machine that comprises a stator having at least two, phase windings and a rotor that comprises at least one permanent magnet, said machine also comprising a control circuit that comprises at least two switches that are allocated to a phase winding, the method comprising:
- determining a pulse control factor periodically for each individual phase winding;
determining, based on said pulse control factor, time periods during which the phase winding is influenced by way of the allocated switch either with an upper supply voltage or with a lower supply voltage; and
controlling the electronically commutated synchronous machine in accordance with a method of space vector modulation in which at the beginning and/or end of a period zero vectors are applied to the phase windings for a switch-off time duration,wherein in each case either all the switches that are connected to the upper supply voltage or all the switches that are connected to the lower supply voltage conduct, and the zero vector is selected in accordance with the phase winding having the greatest deviation from the mean pulse control factor, said mean pulse control factor corresponding to a mean value between the upper supply voltage and lower supply voltage.
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Accused Products
Abstract
A method for operating an electronically commutated synchronous machine, having a stator with at least two, in particular three, phase windings and a rotor having at least one permanent magnet. A control factor is determined periodically for each phase winding. The time periods during which an upper and lower supply voltage is applied to the phase winding are determined based on the control factor. The electronically commutated synchronous machine is actuated according to space vector modulation. Zero vectors are applied to the phase windings at the beginning and/or end of a period for a switch-off duration. All switches connected to the upper supply voltage or all switches connected to the lower supply voltage are on. The selection of the zero vector is performed in accordance with the phase winding with the greatest, in magnitude, deviation from the average control factor. As disclosed is an actuation circuit and the use thereof.
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Citations
12 Claims
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1. A method for operating an electronically commutated synchronous machine that comprises a stator having at least two, phase windings and a rotor that comprises at least one permanent magnet, said machine also comprising a control circuit that comprises at least two switches that are allocated to a phase winding, the method comprising:
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determining a pulse control factor periodically for each individual phase winding; determining, based on said pulse control factor, time periods during which the phase winding is influenced by way of the allocated switch either with an upper supply voltage or with a lower supply voltage; and controlling the electronically commutated synchronous machine in accordance with a method of space vector modulation in which at the beginning and/or end of a period zero vectors are applied to the phase windings for a switch-off time duration, wherein in each case either all the switches that are connected to the upper supply voltage or all the switches that are connected to the lower supply voltage conduct, and the zero vector is selected in accordance with the phase winding having the greatest deviation from the mean pulse control factor, said mean pulse control factor corresponding to a mean value between the upper supply voltage and lower supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification