Phase detection method, phase detecting apparatus, synchronous-motor control method, and synchronous motor controller
First Claim
Patent Images
1. A phase detection method comprising:
- determining which of a plurality of continuous sections having different magnitude correlation of signal amplitude of each phase a section is, based on an input signal amplitude value of a plurality of phases;
normalizing including performing predetermined subtraction with respect to the signal amplitude between respective phases for each section determined at the determining, to obtain a normalized amplitude value normalized in the section, using the subtraction result; and
outputting including converting the normalized amplitude value obtained at the normalizing to a vector phase for one cycle based on a predetermined phase, and outputting the vector phase corresponding to the section determined at the determining.
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Abstract
It is determined which of six continuous sections having different magnitude correlation of signal amplitude of each phase of an input three-phase signal a section is. Predetermined subtraction is performed between respective phases in the section, to obtain a normalized amplitude value normalized in the section, using the subtraction result. The normalized amplitude value is converted to a vector phase for one cycle based on a predetermined phase and output corresponding to the determined section.
11 Citations
44 Claims
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1. A phase detection method comprising:
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determining which of a plurality of continuous sections having different magnitude correlation of signal amplitude of each phase a section is, based on an input signal amplitude value of a plurality of phases; normalizing including performing predetermined subtraction with respect to the signal amplitude between respective phases for each section determined at the determining, to obtain a normalized amplitude value normalized in the section, using the subtraction result; and outputting including converting the normalized amplitude value obtained at the normalizing to a vector phase for one cycle based on a predetermined phase, and outputting the vector phase corresponding to the section determined at the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A phase detection method comprising:
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determining which of six continuous sections, first to sixth sections, in which magnitude correlation of a signal amplitude value of an input three-phase signal of R-phase, S-phase, and T-phase takes a R-phase value>
T-phase value>
S-phase value, a R-phase value>
S-phase value>
T-phase value, a S-phase value>
R-phase value>
T-phase value, a S-phase value>
T-phase value>
R-phase value, a T-phase value>
S-phase value>
R-phase value, and a T-phase value>
R-phase value>
S-phase value, the section is;calculating the first section by ((R-phase value)−
(T-phase value))/((R-phase value)−
(S-phase value)), the second section by ((S-phase value)−
(T-phase value))/((R-phase value)−
(T-phase value)), the third section by ((S-phase value)−
(R-phase value))/((S-phase value)−
(T-phase value)), the fourth section by ((T-phase value)−
(R-phase value))/((S-phase value)−
(R-phase value)), the fifth section by ((T-phase value)−
(S-phase value))/((T-phase value)−
(R-phase value)), the sixth section by ((R-phase value)−
(S-phase value))/((T-phase value)−
(S-phase value)), to obtain a normalized amplitude value normalized in each section; andsecond outputting including multiplying the normalized amplitude value of the first to the sixth sections, respectively, by a phase of 60°
, to calculate a phase value by adding phases of 30°
, 90°
, 150°
, 210°
, 270°
, and 330°
, respectively, to the multiplied values of the first to the sixth sections, and when the phase value of the sixth section is equal to or larger than 360°
, obtaining a phase value by subtracting the phase of 360°
from the phase value, and outputting a vector phase for one cycle. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A phase detecting apparatus comprising:
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a section determining unit that determines which of a plurality of continuous sections having different magnitude correlation of signal amplitude of each phase a section is, based on an input signal amplitude value of a plurality of phases; an amplitude normalizing unit that performs predetermined subtraction with respect to the signal amplitude between respective phases for each section determined by the section determining unit, to obtain a normalized amplitude value normalized in the section, using the subtraction result; and a phase outputting unit that converts the normalized amplitude value obtained by the amplitude normalizing unit to a vector phase for one cycle based on a predetermined phase, and outputs the vector phase corresponding to the section determined by the section determining unit. - View Dependent Claims (24, 25, 26, 27, 29, 30, 31, 32, 33, 34)
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28. A synchronous motor controller comprising:
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a current phase detector that acquires a vector phase of current to be applied to the synchronous motor by the phase detecting apparatus according to 23; a power factor calculator that calculates a power factor, which is a phase difference between a voltage vector phase and the current vector phase detected by the current phase detector, on a real time basis; and a control unit that performs synchronous control with respect to the synchronous motor based on the power factor obtained by the power factor calculator, wherein the voltage vector phase to be input to the power factor calculator is controlled by the control unit, so that the phase is a phase of a voltage drive signal for generating an AC signal to be applied to the synchronous motor.
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35. A phase detecting apparatus comprising:
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a section determining unit that determines which of six continuous sections, first to sixth sections, in which magnitude correlation of a signal amplitude value of an input three-phase signal of R-phase, S-phase, and T-phase takes a R-phase value>
T-phase value>
S-phase value, a R-phase value>
S-phase value>
T-phase value, a S-phase value>
R-phase value>
T-phase value, a S-phase value>
T-phase value>
R-phase value, a T-phase value>
S-phase value>
R-phase value, and a T-phase value>
R-phase value>
S-phase value, the section is;an amplitude normalizing unit that calculates the first section by ((R-phase value)−
(T-phase value))/((R-phase value)−
(S-phase value)), the second section by ((S-phase value)−
(T-phase value))/((R-phase value)−
(T-phase value)), the third section by ((S-phase value)−
(R-phase value))/((S-phase value)−
(T-phase value)), the fourth section by ((T-phase value)−
(R-phase value))/((S-phase value)−
(R-phase value)), the fifth section by ((T-phase value)−
(S-phase value))/((T-phase value)−
(R-phase value)), the sixth section by ((R-phase value)−
(S-phase value))/((T-phase value)−
(S-phase value)), to obtain a normalized amplitude value normalized in each section; anda phase outputting unit that multiplies the normalized amplitude value of the first to the sixth sections, respectively, by a phase of 60°
, to calculate a phase value by adding phases of 30°
, 90°
, 150°
, 210°
, 270°
, and 330°
, respectively, to the multiplied values of the first to the sixth sections, and when the phase value of the sixth section is equal to or larger than 360°
, obtains a phase value by subtracting the phase of 360°
from the phase value, and outputs a vector phase for one cycle. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification