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;
wherein the command voltage determiner is configured to adjust, to a target value, a temporal difference between the zero crossing of the line-to-line current and the zero crossing of the amount of change in the line-to-line current.
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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.
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Citations
24 Claims
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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:
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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; wherein the command voltage determiner is configured to adjust, to a target value, a temporal difference between the zero crossing of the line-to-line current and the zero crossing of the amount of change in the line-to-line current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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:
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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; wherein the rotary machine is a three-phase rotary machine with three-phase windings including the first phase winding, the second phase winding, and a third phase winding, the switching circuit comprises three-phase higher switching elements connected with one ends of the three-phase windings, respectively, and three-phase lower switching elements connected in series with the three-phase higher switching elements, respectively, the one end of each of the three-phase windings being connected with a connecting point between one of the three-phase higher switching elements and a corresponding one of the lower switching elements, the first zero crossing detector being configured to; measure a current flowing each phase switching element of one of the three-phase higher switching elements and the three-phase lower switching elements; detect the zero crossing of the line-to-line current based on the measured current; and switch, based on an amplitude of the command voltage value, a timing of the detection of the zero crossing between when only the first and second phase windings are short-circuited to the predetermined potential and when all of the first, second, and third phase windings are short-circuited to the predetermined potential, the second zero crossing detector being configured to; measure the current flowing each phase switching element of one of the three-phase higher switching elements and the three-phase lower switching elements; detect the zero crossing of the amount of change in the line-to-line current based on the measured current; and switch, based on the amplitude of the command voltage value, a timing of the detection of the zero crossing between when only the first and second phase windings are short-circuited to the predetermined potential and when all of the first, second, and third phase windings are short-circuited to the predetermined potential.
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16. 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:
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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 he 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 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; wherein the rotary machine is a three-phase rotary machine with three-phase windings including the first phase winding, the second phase winding, and a third phase winding, the switching circuit comprises three-phase higher switching elements connected with one ends of the three-phase windings, respectively, and three-phase lower switching elements connected in series with the three-phase higher switching elements, respectively, the other end of each of the three-phase windings being connected with a connecting point between one of the three-phase higher switching elements and a corresponding one of the lower switching elements, the first zero crossing detector being configured to; measure a current flowing each phase switching element of each of the three-phase higher switching elements and the three-phase lower switching elements; detect the zero crossing of the line-to-line current using any one of the measured current of each phase switching element of the three-phase higher switching elements and that of each phase switching element of the three-phase lower switching elements; and switch the use of any one of the measured current of each phase switching element of the three-phase higher switching elements and that of each phase switching element of the three-phase lower switching elements according to change in an electrical angular position of the rotation of the three-phase rotary machine, the second zero crossing detector being configured to; measure the current flowing each phase switching element of each of the three-phase higher switching elements and the three-phase lower switching elements; detect the zero crossing of the amount of change in the line-to-line current using any one of the measured current of each phase switching element of the three-phase higher switching elements and that of each phase switching element of the three-phase lower switching elements; and switch the use of any one of the measured current of each phase switching element of the three-phase higher switching elements and that of each phase switching element of the three-phase lower switching elements according to change in the electrical angular position of the rotation of the three-phase rotary machine. - View Dependent Claims (17)
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18. 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:
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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 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 of 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; wherein the rotary machine is a three-phase rotary machine with three-phase windings including the first phase winding, the second phase winding, and a third phase winding, the switching circuit comprises three-phase higher switching elements connected with one ends of the three-phase windings, respectively, and three-phase lower switching elements connected in series with the three-phase higher switching elements, respectively, the one end of each of the three-phase windings being connected with a connecting point between one of the three-phase higher switching elements and a corresponding one of the lower switching elements, the switching circuit having first and second input terminals to which the direct current voltage is applied, further comprising; a two-phase modulator configured to two-phase modulate the first, second, and third command voltage values by matching any one of the first, second, and third command voltage values with any one of higher and lower voltages at the first and second input terminals while maintaining a difference in voltage among the first, second, and third command voltage values, a deviation in voltage between any one of the first, second, and third command voltage values and any one of the higher and lower voltages being minimum, the driving unit working to individually drive the three-phase higher switching elements and three-phase lower switching elements on and off to thereby modulate the direct current voltage to be matched with the two-phase modulated first, second, and third command voltage values.
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19. 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:
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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; 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 he applied to the multiphase windings; and 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, wherein the command voltage determiner is configured to determine the 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, the detected zero crossing of the amount of change in the line-to-line current, and the determination of the control mode determiner; wherein the command voltage determiner is configured to; adjust at least one of an amplitude, a phase, and an electrical angular rate of the command voltage value based on the temporal difference between the zero crossing of the line-to-line current and the zero crossing of the amount of change in the line-to-line current so as to match the temporal difference therebetween with a target value; and invert a direction of the adjustment of the at least one of the amplitude, phase, and electrical angular rate of the command voltage value between when it is determined that the control system is operating in the power running control mode and when it is determined that the control system is operating in the regenerative control mode. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification