US5202613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-phase brushless DC motor controller
Assignee: Individual
•
Filing: 1992-05-05
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Granted: 1993-04-13
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Expires: 2012-05-05
Abstract
Abstract Control circuits for operating a two-phase brushless dc motor from a dc power source are described. Control of the motor is optimized by detecting induced back EMF of the two phases to sense rotor phase position. It is common knowledge that the voltage developed across the terminals of a permanent magnet motor can be represented by a winding resistance, a winding inductance and a generated back EMF. In two-phase brushless dc and permanent magnet stepping motors, the induced back EMFs of the two phases are displaced from each other by 90 electrical degrees. Thus, by detecting the back EMFs of the two phases, an accurate relative position of rotor-to-stator can be determined at any rotor position. Commutation of the motor phases and closed loop control of the motor and load is achieved by accurately sensing the back EMFs of the two phases. Also, phase position of the permanent magnet rotor poles is detected by integrating the sensed back EMFs of the two phases to produce quadrature sinewaves the magnitudes of which are constant relative to rotor speed.
Inventors
- 👤 David L. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:14
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/10; H02P6/08; H02P6/14; H02P6/16; H02P6/18; H02P6/182
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
92 words
A control circuit comprising, motor means with a plurality of phases; a plurality of phase position detector circuit means connected to receive first signals form each of said phases, respectively; a plurality of power amplifier means connected to receive second signals from each of said phases, respectively; multiplier means connected to supply signals to respective ones of said power amplifier means as a function of the operating mode of said control circuit; and controller means for supplying control siganls to said multiplier means to determine the operating mode of said control circuit.
Claim 2
Dependent Claim
92 words
A control circuit comprising, motor means with a plurality of phases; a plurality of phase position detector circuit means connected to receive first signals form each of said phases, respectively; a plurality of power amplifier means connected to receive second signals from each of said phases, respectively; multiplier means connected to supply signals to respective ones of said power amplifier means as a function of the operating mode of said control circuit; and controller means for supplying control siganls to said multiplier means to determine the operating mode of said control circuit.
Claim 3
Dependent Claim
21 words
The control circuit recited in claim 1 further including, integrator bias circuit means connected to said phase position detector circuit means.
Claim 4
Dependent Claim
14 words
The control circuit recited in claim 1 wherein, said multiplier means comprise four-quadrant multipliers.
Claim 5
Dependent Claim
27 words
The control circuit recited in claim 3 wherein, said four-quadrant multiplier operates to selectively supply phase position signals to different ones of said power amplifier means alternatively.
Claim 6
Dependent Claim
26 words
The control circuit recited in claim 4 wherein, said four-quadrant multiplier includes a DPDT switch which is controlled by a control signal from said controller means.
Claim 7
Dependent Claim
16 words
The control circuit recited in claim 1 wherein, said power amplifier means comprise switching servo amplifiers.
Claim 8
Dependent Claim
23 words
The control circuit recited in claim 1 further including, summing means connected between said multiplier means and said phase position detector circuit means.
Claim 9
Dependent Claim
22 words
The control circuit recited in claim 1 wherein, said controller means supplies bias control signals to said phase position detector circuit means.
Claim 10
Independent Claim
126 words
A system for controlling a multiphase motor comprising, controller means, a separate phase position detector means connected to each phase of the multiphase motor to receive a first signal therefrom, each of said separate phase position detector means connected to supply a signal to said controller means, a separate amplifier means connected to each phase of the multiphase motor to receive a second signal therefrom and to supply a third signal thereto, and multiplier means connected to receive a control signal from said controller means wherein said control signal is representative of the signal supplied to said controller means by said phase detector means, said multiplier means connected to supply different signals to said smplifier means dependent upon the control signal received form said controller means.
Claim 11
Independent Claim
126 words
A system for controlling a multiphase motor comprising, controller means, a separate phase position detector means connected to each phase of the multiphase motor to receive a first signal therefrom, each of said separate phase position detector means connected to supply a signal to said controller means, a separate amplifier means connected to each phase of the multiphase motor to receive a second signal therefrom and to supply a third signal thereto, and multiplier means connected to receive a control signal from said controller means wherein said control signal is representative of the signal supplied to said controller means by said phase detector means, said multiplier means connected to supply different signals to said smplifier means dependent upon the control signal received form said controller means.
Claim 12
Dependent Claim
24 words
The system recited in claim 9 wherein, said controller means includes a mode control switch which supplies said control signal to said multiplier means.
Claim 13
Dependent Claim
14 words
The system recited in claim 10 wherein, said multiplier means comprises four-quadrant multiplier circuits.
Claim 14
Dependent Claim
33 words
The system recited in claim 9 including analog-to-digital conversion means connected between said phase position detector means and said controller means, and digital-to-analog conversion means connected between said controller means and multiplier means.
Claim 15
Dependent Claim
31 words
The system recited in claim 9 wherein, each said amplifier means includes sense amplifier means, said sense amplifier means connected to receive said second signal and to produce a sense signal.
Claim 16
Dependent Claim
52 words
The system recited in claim 13 wherein, each said phase position detector means includes integrator means connected to receive said first signal from the respective phase of the multiphase motor, and summing means connected to receive the output signal from said integrator means and said sense signal from said sense amplifier means.
Claim 17
Dependent Claim
23 words
The system recited in claim 14 including, bias amplifiers connected from said controller means to said integrator means to control the operation thereof.
Claim 18
Dependent Claim
59 words
The system recited in claim 13 wherein, each said smplifier means includes, error amplifier means, second summing means connected to receive said sense signal and to receive a signal from said multiplier means and to provide an input signal to said error amplifier means, and a power amplifier connected to receive the signal produced by said error amplifier means.
Claim 19
Dependent Claim
30 words
The system recited in claim 16 wherein, said power amplifier produces pulse width modulated output signals which are supplied to each phase of said multiphase motor as said third signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |