Patent US5583404A successfully refreshed from Google Patents.
US5583404A
Expired / Lapsed
US
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Drive circuit for brushless DC motors
Assignee: Papst Licensing GmbH and Co KG
•
Filing: 1992-10-05
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Granted: 1996-12-10
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Expires: 2012-10-05
Abstract
Abstract A drive circuit for brushless DC motors comprising a rotor and a stator with at least one stator coil includes a commutation device which supplies commutation pulses of drive current to the stator coil(s). The commutation device senses the rotor position and calculates current rotor speed therefrom. The rotor speed is then used to shift the commutation currents according to predetermined functions. The shifting of commutation currents is occasioned by shifting either or both of the ignition part of a commutation pulse and the extinction part of such pulses.
Inventors
- 👤 Arno Karwath
- 👤 Mojtaba Moini
- 👤 Eberhard Wunsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:50
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08; H02P6/085; H02P6/06; H02P6/14; H02P6/16; H02P6/17; Y; Y02; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
110 words
A drive circuit for a brushless DC motor with a rotor and a stator housing at least one stator coil, said drive circuit comprising: first apparatus for measuring angular position of the rotor relative to the stator and for determining motor speed; commutator means for connecting and interrupting current to the stator coil at specified moments of commutation determined from the angular rotor position relative to the stator; and a commutation shifting apparatus for shifting the specified moments of commutation, the amount of shifting being a predetermined function of motor speed, wherein the moments of commutation are shifted as a function of the motor speed according to a linear function.
Claim 2
Dependent Claim
110 words
A drive circuit for a brushless DC motor with a rotor and a stator housing at least one stator coil, said drive circuit comprising: first apparatus for measuring angular position of the rotor relative to the stator and for determining motor speed; commutator means for connecting and interrupting current to the stator coil at specified moments of commutation determined from the angular rotor position relative to the stator; and a commutation shifting apparatus for shifting the specified moments of commutation, the amount of shifting being a predetermined function of motor speed, wherein the moments of commutation are shifted as a function of the motor speed according to a linear function.
Claim 3
Dependent Claim
38 words
A drive circuit according to claim 1, wherein commutation shifting apparatus pre-displaces the moments of commutation by a specified, first electrical preignition angle with respect to the rotational position of the rotor, upon initial start-up of the rotor.
Claim 4
Dependent Claim
56 words
A drive circuit according to claim 2, wherein the commutation shifting apparatus pre-displaces the moments of commutation after start-up, during a ramping of the motor, by a specified, second electrical preignition angle with respect to the rotational position of the motor, and that the second electrical preignition angle is smaller than the first electrical preignition angle.
Claim 5
Dependent Claim
33 words
A drive circuit according to claim 1, wherein the commutation shifting apparatus pre-displaces the moments of commutation increasingly toward the rotational position of the rotor after a specified motor speed has been exceeded.
Claim 6
Dependent Claim
28 words
A drive circuit according to claim 1, wherein the commutation shifting apparatus shifts the moment for turn-on of a motor current that is allocated to one commutation phase.
Claim 7
Dependent Claim
28 words
A drive circuit according to claim 1, wherein the commutation shifting apparatus shifts the moment for turn-off of a motor current that is allocated to one commutation phase.
Claim 8
Dependent Claim
27 words
A drive circuit according to claim 1, wherein the moments of commutation are shifted as a function of the motor speed according to a progressively rising function.
Claim 9
Dependent Claim
25 words
A drive circuit according to claim 1, wherein the moments of commutation are shifted as a function of the motor speed according to memory values.
Claim 10
Dependent Claim
58 words
A drive circuit according to claim 1, wherein the drive circuit contains a power supply unit that feeds power to the stator of the brushless DC motor with a pulse train that has a speed-independent frequency of more than 5000 Hz, and whose individual pulses have a pulse duty factor of at least 0% and at most 100%.
Claim 11
Dependent Claim
15 words
A drive circuit according to claim 1, wherein the drive circuit comprises a microprocessor controller.
Claim 12
Dependent Claim
12 words
A drive circuit according to claim 1, comprising a speed control device.
Claim 13
Dependent Claim
17 words
A drive circuit according to claim 1, the motor speed is controlled as a function of temperature.
Claim 14
Dependent Claim
25 words
A drive circuit according to claim 1, comprising a current measuring device coupled to the motor for measuring the total motor current at specified times.
Claim 15
Dependent Claim
16 words
A drive circuit according to claim 1, comprising a temperature sensor coupled to the commutator means.
Claim 16
Dependent Claim
26 words
A drive circuit according to claim 1, wherein a device is provided that produces an alarm signal when the motor is operated at below desired speed.
Claim 17
Dependent Claim
25 words
A drive circuit according to claim 15, wherein the alarm signal will be valid when it has a level between preset minimum and maximum values.
Claim 18
Dependent Claim
20 words
A drive circuit according to claim 1, wherein a device is provided to protect the motor against overload during blocking.
Claim 19
Dependent Claim
29 words
A drive circuit according to claim 1, with a start-up device consisting of a temperature-dependent resistor for the motor coil, to which an electronic circuit is connected in parallel.
Claim 20
Dependent Claim
54 words
A drive circuit according to claim 1, wherein a magnetogalvanic commutation signal generator is provided that outputs a preshifted commutation signal according to phase angle, of about 1°-50° (electric) of preshift, relative to a zero crossing of a reference signal, that will be induced when the rotor turns in at least one stator coil.
Claim 21
Dependent Claim
53 words
A drive circuit according to claim 1, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be changed continuously, where the individual pulses have a frequency of more than 5000 Hz.
Claim 22
Dependent Claim
42 words
A drive circuit according to claim 1, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be changed in steps.
Claim 23
Dependent Claim
64 words
A drive circuit according to claim 1, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be switched to zero with a frequency of more than 5000 Hz after passage of about 95% of the amount of time of said commutation phase.
Claim 24
Dependent Claim
54 words
A drive circuit according to claim 1, wherein, during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the single pulses will be limited according to a function defining that a pulse duty factor limit cannot be exceeded but may be understepped.
Claim 25
Dependent Claim
43 words
A drive circuit according to claim 1, wherein the speed control device for the motor is designed as a digitally operating PID controller whose sense intervals are reduced inversely proportional to the rising speed, and whose control coefficients are tracked according to rpm.
Claim 26
Dependent Claim
38 words
A drive circuit in accordance with claim 1 wherein the first apparatus comprises means for measuring motor speed and the amount of commutation moment shifting by the commutation shifting apparatus is a predetermined function of measured motor speed.
Claim 27
Dependent Claim
33 words
A drive circuit according to claim 25, wherein the commutation shifting apparatus pre-displaces the moments of commutation relative to the rotational position of the rotor, as a function of the estimated motor speed.
Claim 28
Dependent Claim
38 words
A drive circuit in accordance with claim 1 wherein the first apparatus comprises means for estimating motor speed and the amount of commutation moment shifting by the commutation shifting apparatus is a predetermined function of estimated motor speed.
Claim 29
Dependent Claim
99 words
A drive circuit for a brushless DC motor with a rotor and a stator housing at least one stator coil, said drive circuit comprising: first apparatus for measuring angular position of the rotor relative to the stator and for determining motor speed; commutator means for connecting and interrupting current to the stator coil at specified moments of commutation determined from the angular rotor position relative to the stator; and a commutation shifting apparatus for shifting the specified moments of commutation, the amount of shifting being a predetermined function of motor speed, wherein the predetermined function is a nonlinear function.
Claim 30
Dependent Claim
99 words
A drive circuit for a brushless DC motor with a rotor and a stator housing at least one stator coil, said drive circuit comprising: first apparatus for measuring angular position of the rotor relative to the stator and for determining motor speed; commutator means for connecting and interrupting current to the stator coil at specified moments of commutation determined from the angular rotor position relative to the stator; and a commutation shifting apparatus for shifting the specified moments of commutation, the amount of shifting being a predetermined function of motor speed, wherein the predetermined function is a nonlinear function.
Claim 31
Dependent Claim
38 words
A drive circuit according to claim 28, wherein commutation shifting apparatus pre-displaces the moments of commutation by a specified, first electrical preignition angle with respect to the rotational position of the rotor, upon initial start-up of the rotor.
Claim 32
Dependent Claim
56 words
A drive circuit according to claim 23, wherein the commutation shifting apparatus pre-displaces the moments of commutation after start-up, during a ramping of the motor, by a specified, second electrical preignition angle with respect to the rotational position of the motor, and that the second electrical preignition angle is smaller than the first electrical preignition angle.
Claim 33
Dependent Claim
33 words
A drive circuit according to claim 28, wherein the commutation shifting apparatus pre-displaces the moments of commutation increasingly toward the rotational position of the rotor after a specified motor speed has been exceeded.
Claim 34
Dependent Claim
28 words
A drive circuit according to claim 28, wherein the commutation shifting apparatus shifts the moment for turn-on of a motor current that is allocated to one commutation phase.
Claim 35
Dependent Claim
28 words
A drive circuit according to claim 28, wherein the commutation shifting apparatus shifts the moment for turn-off of a motor current that is allocated to one commutation phase.
Claim 36
Dependent Claim
27 words
A drive circuit according to claim 28, wherein the moments of commutation are shifted as a function of the motor speed according to a progressively rising function.
Claim 37
Dependent Claim
25 words
A drive circuit according to claim 28, wherein the moments of commutation are shifted as a function of the motor speed according to memory values.
Claim 38
Dependent Claim
58 words
A drive circuit according to claim 28, wherein the drive circuit contains a power supply unit that feeds power to the stator of the brushless DC motor with a pulse train that has a speed-independent frequency of more than 5000 Hz, and whose individual pulses have a pulse duty factor of at least 0% and at most 100%.
Claim 39
Dependent Claim
15 words
A drive circuit according to claim 28, wherein the drive circuit comprises a microprocessor controller.
Claim 40
Dependent Claim
12 words
A drive circuit according to claim 28, comprising a speed control device.
Claim 41
Dependent Claim
17 words
A drive circuit according to claim 28, the motor speed is controlled as a function of temperature.
Claim 42
Dependent Claim
25 words
A drive circuit according to claim 28, comprising a current measuring device coupled to the motor for measuring the total motor current at specified times.
Claim 43
Dependent Claim
16 words
A drive circuit according to claim 28, comprising a temperature sensor coupled to the commutator means.
Claim 44
Dependent Claim
26 words
A drive circuit according to claim 28 wherein a device is provided that produces an alarm signal when the motor is operated at below desired speed.
Claim 45
Dependent Claim
25 words
A drive circuit according to claim 42, wherein the alarm signal will be valid when it has a level between preset minimum and maximum values.
Claim 46
Dependent Claim
20 words
A drive circuit according to claim 28, wherein a device is provided to protect the motor against overload during blocking.
Claim 47
Dependent Claim
29 words
A drive circuit according to claim 28, with a start-up device consisting of a temperature-dependent resistor for the motor coil, to which an electronic circuit is connected in parallel.
Claim 48
Dependent Claim
54 words
A drive circuit according to claim 28, wherein a magnetogalvanic commutation signal generator is provided that outputs a preshifted commutation signal according to phase angle, of about 1°-50° (electric) of preshift, relative to a zero crossing of a reference signal, that will be induced when the rotor turns in at least one stator coil.
Claim 49
Dependent Claim
53 words
A drive circuit according to claim 28, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be changed continuously, where the individual pulses have a frequency of more than 5000 Hz.
Claim 50
Dependent Claim
42 words
A drive circuit according to claim 28, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be changed in steps.
Claim 51
Dependent Claim
64 words
A drive circuit according to claim 28, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the individual pulses of the stator current will be switched to zero with a frequency of more than 5000 Hz after passage of about 95% of the amount of time of said commutation phase.
Claim 52
Dependent Claim
54 words
A drive circuit according to claim 28, wherein during the rotational motion of the rotor during one commutation phase, between two neighboring moments of commutation, the pulse duty factor of the single pulses will be limited according to a function defining that a pulse duty factor limit cannot be exceeded but may be understepped.
Claim 53
Dependent Claim
43 words
A drive circuit according to claim 28, wherein the speed control device for the motor is designed as a digitally operating PID controller whose sense intervals are reduced inversely proportional to the rising speed, and whose control coefficients are tracked according to rpm.
Claim 54
Dependent Claim
38 words
A drive circuit in accordance with claim 28 wherein the first apparatus comprises means for measuring motor speed and the amount of commutation moment shifting by the commutation shifting apparatus is a predetermined function of measured motor speed.
Claim 55
Dependent Claim
33 words
A drive circuit according to claim 52, wherein the commutation shifting apparatus pre-displaces the moments of commutation relative to the rotational position of the rotor, as a function of the estimated motor speed.
Claim 56
Dependent Claim
38 words
A drive circuit in accordance with claim 28, wherein the first apparatus comprises means for estimating motor speed and the amount of commutation moment shifting by the commutation shifting apparatus is a predetermined function of estimated motor speed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-10 | 2000-06-10 | 2000-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-10 | 2004-06-10 | 2004-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-10 | 2008-06-10 | 2008-12-10 | $7700.00 | Window Closed / Lapsed |