Device for operating synchronous motors and associated method
First Claim
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1. A device for operating a synchronous machine, comprising:
- a three-phase AC power controller connectable to a three-phase system and including at least two semiconductor controllers for the phases of the three-phase system;
a position encoder configured to determine a position angle of the rotor of the synchronous machine;
a first device configured to determine the system voltage phase position for at least one of the phases of the three-phase system;
at least one second device, configured to specify a pair of two of the semiconductor controllers on the basis of the position angle of the rotor;
at least one third device, configured to specify switching instants for the semiconductor controllers of the respective pair on the basis of the system voltage phase position; and
at least one fourth device, configured to specify an appropriate system voltage phase position for the pair of two of the semiconductor controllers for producing a positive torque on the basis of the position angle of the rotor, whereinthe at least one fourth device, configured to specify an appropriate system voltage phase position for the pair of two of the semiconductor controllers is designed to perform the specification on the basis of sub-ranges for the total angular range of the position angle, 0 to 360°
, wherein at least some of the sub-ranges are each assigned an appropriate system voltage phase position for the pair of two of the semiconductor controllers, and the at least one fourth device, configured to specify an appropriate system voltage phase position specifies the system voltage phase position assigned to the sub-range containing the position angle.
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Abstract
The synchronous motors are controlled by a three-phase AC power controller. According to an embodiment of the invention, firing points for the AC power controller are determined. A pair of two or three phases is determined from the angular position of the rotor, for which the firing points can be present for the respective A.C power controller. Actual firing points are determined from the mains voltage phase position of the phases so that only positive torque is produced.
9 Citations
10 Claims
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1. A device for operating a synchronous machine, comprising:
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a three-phase AC power controller connectable to a three-phase system and including at least two semiconductor controllers for the phases of the three-phase system; a position encoder configured to determine a position angle of the rotor of the synchronous machine; a first device configured to determine the system voltage phase position for at least one of the phases of the three-phase system; at least one second device, configured to specify a pair of two of the semiconductor controllers on the basis of the position angle of the rotor; at least one third device, configured to specify switching instants for the semiconductor controllers of the respective pair on the basis of the system voltage phase position; and at least one fourth device, configured to specify an appropriate system voltage phase position for the pair of two of the semiconductor controllers for producing a positive torque on the basis of the position angle of the rotor, wherein the at least one fourth device, configured to specify an appropriate system voltage phase position for the pair of two of the semiconductor controllers is designed to perform the specification on the basis of sub-ranges for the total angular range of the position angle, 0 to 360°
, wherein at least some of the sub-ranges are each assigned an appropriate system voltage phase position for the pair of two of the semiconductor controllers, and the at least one fourth device, configured to specify an appropriate system voltage phase position specifies the system voltage phase position assigned to the sub-range containing the position angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating a synchronous machine including a three-phase AC power controller connected to a three-phase system and including at least two semiconductor controllers, rendered conducting or fired at particular firing instants, the method comprising:
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determining a rotor position angle of the synchronous machine; determining a system voltage phase position in at least one of the phases of the three-phase system; specifying the firing instants on the basis of the position angle and the system voltage phase position such that a positive torque is produced; and specifying an appropriate system voltage phase position for the at least two semiconductor controllers for producing a positive torque on the basis of the position angle of the rotor, wherein specifying the appropriate system voltage phase position for the at least two semiconductor controllers is performed on the basis of sub-ranges for a total angular range of the position angle, 0 to 360°
, wherein at least some of the sub-ranges are each assigned an appropriate system voltage phase position for the at least two semiconductor controllers, and the specify the appropriate system voltage phase position specifies a system voltage phase position assigned to the sub-range containing the position angle.
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Specification