US5043642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling blower motor of automobile air-conditioner
Assignee: Bosch Corp
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Filing: 1990-04-03
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Granted: 1991-08-27
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Expires: 2010-04-03
Abstract
Abstract An apparatus for controlling a brushless type blower motor of an automobile air conditioner includes a rotational speed setting unit for setting a rotational speed of the brushless motor, a drive unit for driving the brushless motor according to the speed of rotation set by the rotational speed setting unit, and a switching control unit for controlling the excitation timing of the brushless motor achieved by the drive unit. The driving unit includes a waveform storage unit for changing the waveform of a voltage to be impressed to the brushless motor. The waveform storage unit outputs a sine waveforms, a trapezoidal waveform or a square waveform according to the rotational speed set by the rotational speed setting unit.
Inventors
- 👤 Shinichi Ohi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:09
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/181; H02P6/08; H02P6/085; H02P2209/00; H02P2209/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
An apparatus for controlling a blower motor in an automobile air-conditioner, the blower motor being composed of a brushless motor, said apparatus comprising: (a) rotational speed setting means for setting a speed of rotation for the brushless motor; (b) drive means for driving the brushless motor while controlling excitation of the brushless motor in such a manner that the speed of rotation of the brushless motor is in equal to a value set by said rotational speed setting means; and (c) switching control means operatively connected to said drive means for controlling excitation timing of the brushless motor achieved by said drive means; wherein said driving means includes a waveform storage means for changing the waveform of a voltage to be impressed to the brushless motor according to an output signal from said rotational speed setting means, said waveform storage means outputting an impressed voltage having a sine waveform when the rotational speed set by said rotational speed setting means is a low rotational speed, outputting an impressed voltage having a substantially trapezoidal waveform when the rotational speed set by said rotational speed setting means is an intermediate rotational speed, and outputting an impressed voltage having a square waveform when the rotational speed set by said rotational speed setting means is a high rotational speed.
Claim 2
Independent Claim
215 words
An apparatus for controlling a blower motor in an automobile air-conditioner, the blower motor being composed of a brushless motor, said apparatus comprising: (a) rotational speed setting means for setting a speed of rotation for the brushless motor; (b) drive means for driving the brushless motor while controlling excitation of the brushless motor in such a manner that the speed of rotation of the brushless motor is in equal to a value set by said rotational speed setting means; and (c) switching control means operatively connected to said drive means for controlling excitation timing of the brushless motor achieved by said drive means; wherein said driving means includes a waveform storage means for changing the waveform of a voltage to be impressed to the brushless motor according to an output signal from said rotational speed setting means, said waveform storage means outputting an impressed voltage having a sine waveform when the rotational speed set by said rotational speed setting means is a low rotational speed, outputting an impressed voltage having a substantially trapezoidal waveform when the rotational speed set by said rotational speed setting means is an intermediate rotational speed, and outputting an impressed voltage having a square waveform when the rotational speed set by said rotational speed setting means is a high rotational speed.
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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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |