Control system for multiphase rotary machines
First Claim
1. A control system for converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine, the control system comprising:
- when at least first and second phase windings of the multiphase windings are short-circuited to a predetermined voltage, a first zero crossing detector configured to detect a zero crossing of an alternating line-to-line current in the multiphase rotary machine, the line-to-line phase current representing a difference between a first phase current flowing through the first phase winding and a second phase current flowing through the second phase winding based on the alternating current voltage;
a second zero crossing detector configured to detect a zero crossing of an amount of change in the line-to-line current when the at least first and second phase windings of the multi-phase windings are short-circuited to the predetermined potential;
a command voltage determiner configured to determine a command voltage value for the alternating current voltage to be applied to the multiphase windings based on the detected zero crossing of the line-to-line current and the detected zero crossing of the amount of change in the line-to-line current; and
a driving unit configured to drive the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings.
1 Assignment
0 Petitions
Accused Products
Abstract
A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the amount of change in the line-to-line current. A driving unit drives the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings.
26 Citations
33 Claims
-
1. A control system for converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine, the control system comprising:
-
when at least first and second phase windings of the multiphase windings are short-circuited to a predetermined voltage, a first zero crossing detector configured to detect a zero crossing of an alternating line-to-line current in the multiphase rotary machine, the line-to-line phase current representing a difference between a first phase current flowing through the first phase winding and a second phase current flowing through the second phase winding based on the alternating current voltage; a second zero crossing detector configured to detect a zero crossing of an amount of change in the line-to-line current when the at least first and second phase windings of the multi-phase windings are short-circuited to the predetermined potential; a command voltage determiner configured to determine a command voltage value for the alternating current voltage to be applied to the multiphase windings based on the detected zero crossing of the line-to-line current and the detected zero crossing of the amount of change in the line-to-line current; and a driving unit configured to drive the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A control system for converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine, the control system comprising:
-
a control mode determiner configured to determine whether the control system is operating in any one of power running control mode for the rotary machine and regenerative control mode therefor; a command voltage determiner configured to determine a command voltage value for the alternating current voltage to be applied to the multiphase windings based on; a zero crossing of a first current parameter associated with an alternating phase current, the alternating phase current flowing through at least one of a first phase winding and a second phase winding of the multiphase windings based on the alternating current voltage, the zero crossing appearing when the at least first and second phase windings are short-circuited to a predetermined voltage; and a zero crossing of a second current parameter associated with an amount of change in the phase current when the at least first and second phase windings are short-circuited to the predetermined potential; and a driving unit configured to drive the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
-
Specification