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US5182500A Expired / Lapsed US ⏱️ 0.0 years remaining

Brushless motor control circuit

Assignee: Toshiba Corp
•
Filing: 1990-09-13
•
Granted: 1993-01-26
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Expires: 2010-09-13
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Abstract

Abstract According to the present invention, control is performed to set a constant difference between two phase inputs among three phase inputs to a three-phase brushless motor. As a result, imbalance between the respective phase inputs (signals) is eliminated, thus performing motor control with good rotational precision. According to the present invention, amplifiers (1 1 -1 3 , 2 1 -2 3 , 3 1 -3 3 ) for receiving rotor position detection signals of the motor are provided in common to the three-phase input lines of the three-phase brushless motor. One of the difference and the sum of a product of two phases signals, among three phase outputs from these amplifiers, and a signal as the square of the remaining phase signal is compared with a constant value. A comparison result signal is fed back to the amplifiers (1 1 -1 3 , or 2 1 -2 3 , or 3 1 -3 3 ) of a common stage of the three-phase input lines to control the rotation of the motor. The product of the two phase signals is obtained by a multiplier (11). The square of the remaining one phase signal is obtained by a square multiplier (12). One of the sum and the difference of the product and the square signals is obtained by an arithmetic unit (13 or 13 1 ). The arithmetic unit output and the constant value are compared by a comparator (14).

Inventors

  • 👤 Toshiro Shimada

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 17:54
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08; H02P6/14; H02P6/16; H02P6/18; H02P6/183; H02P6/10

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 105 words
A brushless motor system comprising: a three-phase motor; plural stages of amplifiers provided at each of three-phase input lines of said motor for receiving rotor position detection signals of said motor; and a control circuit for comparing, with a constant value, one of a difference an da sum of a product of two phase signals, among three phase signals outputted from said amplifiers, and a signal as a square of the remaining phase signal, and for feeding back a comparison result signal to said amplifiers on each line at the same stage of said plural stages of amplifiers, thereby controlling the rotation of said motor.
Claim 2
Dependent Claim 105 words
A brushless motor system comprising: a three-phase motor; plural stages of amplifiers provided at each of three-phase input lines of said motor for receiving rotor position detection signals of said motor; and a control circuit for comparing, with a constant value, one of a difference an da sum of a product of two phase signals, among three phase signals outputted from said amplifiers, and a signal as a square of the remaining phase signal, and for feeding back a comparison result signal to said amplifiers on each line at the same stage of said plural stages of amplifiers, thereby controlling the rotation of said motor.
Claim 3
Dependent Claim 55 words
A brushless motor system according to claim 1, wherein the three phase signals are angular velocity signals having a phase difference of 120° from each other, and the comparison result signal fed back to said amplifiers is commonly supplied to the bias current source terminals of said amplifiers on each line at the same stage.
Claim 4
Dependent Claim 47 words
A brushless motor system according to claim 2, wherein the three phase signals are the rotor signals "H a -H b ", "H b -H c ", and "H c -H a " where H a , H b , and H c are position detection signals.
Claim 5
Dependent Claim 29 words
A brushless motor system according to claim 2, wherein the three phase signals are the rotor position detection signals H a , H b , and H c .
Claim 6
Dependent Claim 17 words
A brushless motor system according to claim 2, wherein the three phase signals are sine wave signals.
Claim 7
Dependent Claim 25 words
A brushless motor system according to any one of claims 1, 2, 3, and 4, wherein the rotor position detection signals are Hall element signals.
Claim 8
Dependent Claim 24 words
A brushless motor system according to claim 1, wherein one of the three phase signals is obtained by synthesizing the two remaining phase signals.

References Cited (Backward Citations)

US4658190A Cited
JPH01136588A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-01-26 1996-07-27 1997-01-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-01-26 2000-07-27 2001-01-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-01-26 2004-07-27 2005-01-26 $7700.00 Window Closed / Lapsed

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