US6028406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for commutating a brushless motor and power supply for a brushless motor
Assignee: Secop GmbH
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Filing: 1997-07-14
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Granted: 2000-02-22
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Expires: 2017-07-14
Abstract
Abstract Method for commutation of a brushless motor being supplied with electrical energy from a DC intermediary circuit via a multi-phase inverter, by which a first current and a second current value are determined and the length of a commutation interval is set in dependence of these current values. With motors being exposed to heavily varying load torques during one rotation, e.g. motors driving a compressor, a stable operation must be reached. For this purpose a correction value is added to the pre-set commutation interval determined by the speed of the motor, said correction value being the result of the difference of the actual value of the intermediary circuit current and a filtered and delayed value of the intermediary circuit current, multiplied by a weighting factor.
Inventors
- 👤 Jens Birk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:55
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P29/00; H02P29/40; H02P2201/00; H02P2201/07
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
Method for commutation of a brushless motor supplied with electrical energy from a DC intermediary circuit via a multiphase inverter, comprising the steps of determining a first current value and a second current value, setting the duration of a commutation interval in dependence of the current values, and adding a correction value to the commutation interval determined by the speed of the motor, said correction value being determined from computing the difference between an actual value of the intermediary circuit current and a filtered, time delayed value of the intermediary circuit current and multiplying the difference by a weighting factor, and in which the moment of the actual value of the intermediate current is selected in dependence of the load on the motor.
Claim 2
Dependent Claim
123 words
Method for commutation of a brushless motor supplied with electrical energy from a DC intermediary circuit via a multiphase inverter, comprising the steps of determining a first current value and a second current value, setting the duration of a commutation interval in dependence of the current values, and adding a correction value to the commutation interval determined by the speed of the motor, said correction value being determined from computing the difference between an actual value of the intermediary circuit current and a filtered, time delayed value of the intermediary circuit current and multiplying the difference by a weighting factor, and in which the moment of the actual value of the intermediate current is selected in dependence of the load on the motor.
Claim 3
Dependent Claim
34 words
Method according to claim 1, in which the load of the motor is expressed in terms of a commutation interval, whereby the moment of sampling is calculated as a function of said commutation interval.
Claim 4
Dependent Claim
34 words
Method according to claim 1, in which the actual value of the intermediary circuit current is determined at least once per commutation interval and no earlier than in the middle of the commutation interval.
Claim 5
Dependent Claim
34 words
Method according to claim 2, in which the actual value of the intermediary circuit current is determined at least once per commutation interval and no earlier than in the middle of the commutation interval.
Claim 6
Dependent Claim
17 words
Method according to claim 1, in which the weighting factor is selected in dependence of the speed.
Claim 7
Dependent Claim
12 words
Method according to claim 1, in which the inverter is block commutated.
Claim 8
Dependent Claim
13 words
Method according to claim 1, in which the inverter is pulse width modulated.
Claim 9
Dependent Claim
14 words
Method according to claim 1, in which the motor is a brushless DC motor.
Claim 10
Dependent Claim
14 words
Method according to claim 1, in which the motor is a switched reluctance motor.
Claim 11
Dependent Claim
111 words
Power supply for a brushless motor, said motor being connected with a DC intermediary circuit via an inverter, comprising a control unit with an input connected to the DC intermediary circuit, the control unit comprising a filter device filtering, delaying and inverting the intermediary circuit current, a first summation point forming the difference between the filtered and delayed intermediary circuit current and the actual intermediary circuit current, a multiplier multiplying the difference by a weighting factor and a second summation point in which the product of the multiplier is added as correction value for a speed dependent commutation interval, the output of the second summation point being connected with the inverter.
Claim 12
Dependent Claim
111 words
Power supply for a brushless motor, said motor being connected with a DC intermediary circuit via an inverter, comprising a control unit with an input connected to the DC intermediary circuit, the control unit comprising a filter device filtering, delaying and inverting the intermediary circuit current, a first summation point forming the difference between the filtered and delayed intermediary circuit current and the actual intermediary circuit current, a multiplier multiplying the difference by a weighting factor and a second summation point in which the product of the multiplier is added as correction value for a speed dependent commutation interval, the output of the second summation point being connected with the inverter.
Claim 13
Dependent Claim
14 words
A power supply according to claim 10, in which the inverter is block commutated.
Claim 14
Dependent Claim
15 words
A power supply according to claim 10, in which the inverter is pulse width modulated.
Claim 15
Dependent Claim
16 words
A power supply according to claim 10, in which the motor is a brushless DC motor.
Claim 16
Dependent Claim
16 words
A power supply according to claim 10, in which the motor is a switched reluctance motor.
References Cited (Backward Citations)
US5465210A
Cited
US5600575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-21 | 2003-08-23 | 2004-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-21 | 2007-08-23 | 2008-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-21 | 2011-08-23 | 2012-02-22 | $7700.00 | Window Closed / Lapsed |