Position detecting device and synchronous motor driving device using the same
First Claim
1. A position detecting device for detecting a motor pole position by using at least two sensor signals, comprising:
- a position detector for executing position calculation by inputting basic-wave component signals in said sensor signals,a correcting means for correcting so as that a position detecting error is reduced,wherein said position detector extracts said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals, and said first determination value is larger than said second determination value and is smaller than a maximum value of said sensor signals, and said second determination value is larger than a minimum value of said sensor signals; and
means for correcting to reduce a position detecting error by calculating signal information representing at least one of a gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making a correction based on the signal information.
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Abstract
A position detecting device which can increase accuracy in detecting the pole position of a motor used to perform quick acceleration and deceleration over the range from a zero speed to a high rotation speed, and a synchronous motor driving device using the position detecting device. A position detector detects basic-wave component signals in sensor signals and executes position calculation. A correcting unit calculates signal information representing at least one of a gain, an offset and a phase by a phase detector from the basic-wave component signals detected by an error calculator, and makes correction based on the calculated signal information such that a position detection error is zero.
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Citations
14 Claims
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1. A position detecting device for detecting a motor pole position by using at least two sensor signals, comprising:
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a position detector for executing position calculation by inputting basic-wave component signals in said sensor signals, a correcting means for correcting so as that a position detecting error is reduced, wherein said position detector extracts said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals, and said first determination value is larger than said second determination value and is smaller than a maximum value of said sensor signals, and said second determination value is larger than a minimum value of said sensor signals; and means for correcting to reduce a position detecting error by calculating signal information representing at least one of a gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making a correction based on the signal information. - View Dependent Claims (2)
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3. A motor driving device comprising:
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a semiconductor device for converting DC power to AC power or converting AC power to DC power; a position detecting device for detecting a motor pole position by using two or more sensor signals; a position detector calculator configured to execute position calculation by inputting basic-wave component signals in said sensor signals, wherein said position detector calculator is configured to extract said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals, and said first determination value is larger than said second determination value, and is smaller than a maximum value of said sensor signal, and said second determination value is larger than a minimum value of said sensor signal; and said means for correcting so as to reduce position detection error by calculating signal information representing at least one of gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making correction based on the signal information. - View Dependent Claims (4)
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5. A motor driving system comprising:
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a semiconductor device for converting from DC power to AC power or converting from AC power to DC power; a position detecting device for detecting a motor pole position by using two or more sensor signals; a sensor unit for generating said sensor signal; a position detector for executing position calculation by inputting basic-wave component signals in said sensor signals, wherein said position detector extracts said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals, and said first determination value is larger than said second determination value, and is smaller than a maximum value of said sensor signal, and said second determination value is larger than a minimum value of said sensor signal; and means for correcting to reduce position detecting error by calculating signal information representing at least one of a gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making correction based on the signal information. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A permanent-magnet synchronous motor driving device comprising:
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a position detecting device for detecting a motor pole position by using two or more sensor signals; a motor controller for producing a PWM drive signal based on a position detected value detected by said position detecting device, and outputting the PWM drive signal to an inverter, thereby driving a permanent-magnet synchronous motor; a sensor unit for generating said sensor signal; a position detector for executing position calculation by inputting basic-wave component signals in said sensor signals, wherein said position detector extracts said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals and said first determination value is larger than said second determination value, and is smaller than a maximum value of said sensor signal, and said second determination value is larger than a minimum value of said sensor signal; and means for correcting to reduce position detection error by calculating signal information representing at least one of a gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making correction based on the signal information. - View Dependent Claims (14)
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Specification