Apparatus and method for driving rotary machine
First Claim
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1. A rotary machine driving apparatus comprising:
- a power conversion circuit including switching elements and rectifying elements connected in parallel with the switching elements respectively to control connection of a power supply to a rotary machine;
a drive control circuit for detecting a time point when an electrical angle of the rotary machine becomes equal to a predetermined electrical angle based on an induced voltage of the rotary machine and thereby set a specified time point providing a basis for operation of the switching elements, wherein the drive control circuit includes;
a permitted period setting means for setting a permitted period for which detection of the predetermined electrical angle based on a detected value of a terminal voltage of the rotary machine is permitted; and
a determining means for determining that a rotating state of the rotary machine is abnormal, when the number of times the predetermined electrical angle continuously occurs either ahead of or behind the permitted period becomes equal to or higher than a threshold value, under a condition that the rotary machine is in the rotating state.
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Abstract
A motor driving apparatus has a loss-of-synchronism monitoring circuit that monitors the rotation of a rotary machine such as a brushless DC motor to detect a sign of transition to a state of loss of synchronism. When the sign is detected, an energization control circuit temporarily stops driving of the rotary machine to bring it into a free running state, and thereafter carries out control so as to resume driving of the rotary machine. Further, the motor driving apparatus has an inverter and a drive control circuit that controls switching operation of the inverter based on rotation of the rotary machine.
39 Citations
50 Claims
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1. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements and rectifying elements connected in parallel with the switching elements respectively to control connection of a power supply to a rotary machine; a drive control circuit for detecting a time point when an electrical angle of the rotary machine becomes equal to a predetermined electrical angle based on an induced voltage of the rotary machine and thereby set a specified time point providing a basis for operation of the switching elements, wherein the drive control circuit includes; a permitted period setting means for setting a permitted period for which detection of the predetermined electrical angle based on a detected value of a terminal voltage of the rotary machine is permitted; and a determining means for determining that a rotating state of the rotary machine is abnormal, when the number of times the predetermined electrical angle continuously occurs either ahead of or behind the permitted period becomes equal to or higher than a threshold value, under a condition that the rotary machine is in the rotating state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements and rectifying elements connected in parallel with the switching elements respectively to control connection of a power supply to a rotary machine; and a drive control circuit for detecting a time when an electrical angle of the rotary machine becomes equal to a predetermined electrical angle based on an induced voltage of the rotary machine and thereby set a specified time point providing a basis for operation of the switching elements, wherein the drive control circuit includes; a permitted period setting means for setting a permitted period for which detection of the predetermined electrical angle based on a detected value of a terminal voltage of the rotary machine is permitted; and the permitted period setting means includes a means for setting under a condition that the rotary machine is in the rotating state, a time required from the predetermined electrical angle to the permitted period based on a rotational speed of the rotary machine determined from a detected value of a time interval between adjacent time points of occurrence of the predetermined electrical angle and a change in the rotational speed of the rotary machine. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A rotary machine driving apparatus comprising:
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a power conversion circuit including a switching element; a comparing means for comparing a terminal voltage of a rotary machine with a reference voltage with respect to magnitude to detect a zero-crossing time point when the reference voltage, which is either a neutral point voltage of the rotary machine or an equivalent thereof, and an induced voltage of the rotary machine agree with each other, and operating the switching element based on the zero-crossing time point; and a correcting means for offset-correcting at least one of a value of the terminal voltage to be compared by the comparing means when a rotational speed of the rotary machine is substantially zero and a value of the reference voltage so as to differentiate the values of the terminal voltage and the reference voltage, wherein; the correcting means includes a resistive element connecting a signal wire for inputting an object to be corrected to the comparing means to a predetermined potential; the object to be corrected is the reference voltage; the rotary machine is a multi-phase rotary machine; and the reference voltage is a virtual neutral point voltage produced by dividing the terminal voltage of each phase of the multi-phase rotary machine with resistive elements.
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17. A rotary machine driving apparatus comprising:
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a power conversion circuit including a switching element; a comparing means for comparing a terminal voltage of a rotary machine with a reference voltage with respect to magnitude to detect a zero-crossing time point when the reference voltage, which is either a neutral point voltage of the rotary machine or an equivalent thereof, and an induced voltage of the rotary machine agree with each other, and operating the switching element based on the zero-crossing time point; and a correcting means for offset-correcting at least one of a value of the terminal voltage to be compared by the comparing means when a rotational speed of the rotary machine is substantially zero and a value of the reference voltage so as to differentiate the values of the terminal voltage and the reference voltage, wherein; the comparing means includes a differential amplifier circuit and an output circuit, and the correcting means includes a pair of elements in the differential amplifier circuit, respectively corresponding to a pair of input terminals of the comparing means, the pair of elements being asymmetrical to each other. - View Dependent Claims (18, 19)
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20. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements that respectively connects a positive pole and a negative pole of a power supply with the rotary machine based on a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; a comparing means for individually comparing a terminal voltage of each phase of the rotary machine with the reference voltage; an acquiring means for acquiring information pertaining to an electrical angle of the rotary machine based on a result of comparison by the comparing means assumed when the zero-crossing time point occurs in a present operating state of the switching elements and an actual result of comparison with respect to each phase, wherein; the acquiring means includes a means for detecting the zero-crossing time point based on agreement between an assumed result of comparison and the actual result of comparison with respect to at least one phase. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements that respectively connects a positive pole and a negative pole of a power supply with the rotary machine based on a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; a comparing means for individually comparing a terminal voltage of each phase of the rotary machine with the reference voltage; an acquiring means for acquiring information pertaining to an electrical angle of the rotary machine based on a result of comparison by the comparing means assumed when the zero-crossing time point occurs in a present operating state of the switching elements and an actual result of comparison with respect to each phase, wherein; the acquiring means includes an abnormality determining means for determining the rotating state of the rotary machine to be abnormal based on disagreement between the result of comparison by the comparing means assumed when the zero-crossing time point occurs in the present operating state of the switching elements and the actual result of comparison with respect to at least one phase. - View Dependent Claims (27, 28, 29)
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30. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements and rectifying means connected in parallel to the switching elements; a comparing means for comparing, with respect to each phase of the rotary machine, a terminal voltage of the rotary machine and any one of a neutral point voltage of the rotary machine and equivalent thereof; and a disconnection detecting means for detecting, under a condition that one phase among phases of the rotary machine is made conductive to one of a pair of input terminals of the power conversion circuit and at least another one phase other than the one phase is made conductive to the other of the pair of input terminals, presence/absence of disconnection based on presence/absence of inversion of the result of comparison of the comparing means corresponding to at least one phase at the time of turning off the switching element which makes either the one of input terminals and the rotary machine. - View Dependent Claims (31, 32)
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33. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, wherein the setting means variably sets the specified time point based on the information pertaining to the change in the rotational speed, and wherein the setting means includes; a required time calculating means for calculating a required time from an occurrence of zero-crossing time point immediately before an occurrence of the specified time point to the occurrence of the specified time point from a time interval between occurrences of the zero-crossing time points; and a correcting means for correcting the required time based on the information.
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34. A rotary machine driving apparatus of comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, the setting means variably setting the specified time point based on the information pertaining to the change in the rotational speed, a comparing means for comparing a terminal voltage of the rotary machine with a reference voltage for magnitude; and a disabling means for disabling comparison by the comparing means for a predetermined period from an occurrence of the zero-crossing time point, wherein the power conversion circuit includes a rectifying means connected in parallel with each of the switching elements, wherein the zero-crossing time point is detected as a time point of inversion of a result of comparison by the comparing means, and wherein the extracting means acquires the information based on a time from when disablement by the disabling means is canceled to when the zero-crossing time point occurs.
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35. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, wherein the setting means variably sets the specified time point based on the information pertaining to the change in the rotational speed, wherein; the extracting means calculates, as the information, an acceleration of the rotary machine based on a plurality of values with respect to time intervals between occurrences of the zero-crossing time point; and the setting means sets the specified time point using the acceleration as the information. - View Dependent Claims (36)
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37. A rotary machine driving apparatus of comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, the setting means variably setting the specified time point based on the information pertaining to the change in the rotational speed, a comparing means for comparing a terminal voltage of the rotary machine with a reference voltage for magnitude; and a disabling means for disabling comparison by the comparing means for a predetermined period from an occurrence of the zero-crossing time point, wherein the power conversion circuit includes a rectifying means connected in parallel with each of the switching elements, wherein the zero-crossing time point is detected as a time point of inversion of a result of comparison by the comparing means, wherein the required time is a time required from the occurrence of zero-crossing time point immediately before an occurrence of the specified time point, and wherein an estimating means is provided for, if the occurrence of zero-crossing time point immediately before has already been completed when disablement by the disabling means is canceled, estimating a time that has elapsed from the occurrence of zero-crossing time point immediately before to the present time based on the induced voltage.
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38. A rotary machine driving apparatus of comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, the setting means variably setting the specified time point based on the information pertaining to the change in the rotational speed, an acceleration calculating means for calculating an acceleration of the rotary machine based on a plurality of values with respect to time intervals between occurrences of the zero-crossing time point; and a limiting means for limiting an amount of energization according to the calculated acceleration.
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39. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, wherein the setting means variably sets the specified time point based on the information pertaining to the change in the rotational speed; wherein the setting means sets the specified time point based on the extracted information when the rotary machine is started from a stopped condition; and the extracted information is an acceleration.
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40. A rotary machine driving apparatus of comprising:
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a power conversion circuit including switching elements operable to control a rotary machine; an extracting means for extracting information pertaining to a change in a rotational speed of the rotary machine from a result of detection of a zero-crossing time point at which an induced voltage of the rotary machine becomes equal to a reference voltage; and a setting means for calculating a time required from an occurrence of the zero-crossing time point to an occurrence of a specified time point that provides a basis for an operation of the switching elements based on a time interval between occurrences of the zero-crossing time point, the setting means variably setting the specified time point based on the information pertaining to the change in the rotational speed, a positioning means for passing a current from one part of phases to another part of phases of the rotary machine before the rotary machine is started and thereby fixing a rotation angle of the rotary machine at a predetermined angle, wherein at least one of the one part of phases and the another part of phases includes a plurality of phases.
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41. A rotary machine driving apparatus comprising:
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a power conversion circuit including switching elements that controls an output of a rotary machine by determining a specified time point for operating the rotary machine based on an induced voltage of the rotary machine; a positioning means for passing a current from one part of phases to another part of phases of the rotary machine thereby to rotate a rotor of the rotary machine before the rotary machine is started and thereby fixing a rotation angle of the rotor of the rotary machine at a predetermined angle, wherein at least one of the one part of phases and the another part of phases includes a plurality of phases. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification