US4879497A
Expired / Lapsed
US
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Method and device for measuring the temperature of a brushless d-c motor
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1988-10-27
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Granted: 1989-11-07
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Expires: 2008-10-27
Abstract
Abstract A method for determining the temperature of a brushless d-c motor with a permanent-magnet rotor and an at least three-phase winding with electronic commutation including determining the curve of an EMF induced in a winding during one phase wherein the winding is in currentless condition, and evaluating the temperature therefrom.
Inventors
- 👤 Helmut Meyer
- 👤 Jurgen Seeberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:54
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/34; G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/20; H02H; H02H7/00; H02H7/08; H02H7/085; H02P29/00; H02P29/60; H02P29/67
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
Method for determining the temperature of a brushless d-c motor with a permanent-magnet rotor and an at least three-phase winding with electronic commutation, which comprises determining the curve of an EMF induced in a winding during one phase wherein the winding is in currentless condition, and evaluating the temperature therefrom.
Claim 2
Dependent Claim
50 words
Method for determining the temperature of a brushless d-c motor with a permanent-magnet rotor and an at least three-phase winding with electronic commutation, which comprises determining the curve of an EMF induced in a winding during one phase wherein the winding is in currentless condition, and evaluating the temperature therefrom.
Claim 3
Dependent Claim
22 words
Method according to claim 1, which includes forming a voltage integral of the EMF within a measuring time period t M .
Claim 4
Dependent Claim
29 words
Method according to claim 1, which includes determining the temperature from the amplitude of the EMF at a given instant of time which is shiftable depending upon rotary speed.
Claim 5
Dependent Claim
27 words
Method according to claim 2, wherein the measuring time period t M is formed by a voltage zero passage and the beginning of a subsequent commutation signal.
Claim 6
Dependent Claim
22 words
Method according to claim 1 which comprises performing a first measurement for forming a reference signal, prior to heating of the motor.
Claim 7
Dependent Claim
95 words
Device for determining the temperature of a brushless d-c motor with a permanent-magnet rotor and an at least three-phase winding, with electronic commutation, comprising an integrator having an input for receiving an EMF induced in the winding, a control device connected to said integrator for starting integration at an instant of zero passage of the EMF and for stopping the integration at the beginning of a subsequent commutation signal, and a circuit post-connected to said integrator for storing the integral of the EMF within a measuring time period in the form of a temperature-proportional signal.
Claim 8
Dependent Claim
95 words
Device for determining the temperature of a brushless d-c motor with a permanent-magnet rotor and an at least three-phase winding, with electronic commutation, comprising an integrator having an input for receiving an EMF induced in the winding, a control device connected to said integrator for starting integration at an instant of zero passage of the EMF and for stopping the integration at the beginning of a subsequent commutation signal, and a circuit post-connected to said integrator for storing the integral of the EMF within a measuring time period in the form of a temperature-proportional signal.
Claim 9
Dependent Claim
27 words
Device according to claim 6, which includes a differential amplifier connected to said input of said integrator via which the induced EMF is fed to said integrator.
Claim 10
Dependent Claim
17 words
Device according to claim 6 wherein said circuit for storing the integral is a peak value rectifier.
References Cited (Backward Citations)
JPS537284A
Cited
DE2833286A1
Cited
JPS55137552A
Cited
GB2075291A
Cited
SU1229883A2
Cited
JPH05248013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |