US5589751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensorless switched reluctance motor
Assignee: LG Electronics Inc
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Filing: 1993-12-16
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Granted: 1996-12-31
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Expires: 2013-12-16
Abstract
Abstract A sensorless SRM suitable to drive the SRM based on the position of a rotor detected through the detection of the variation of the current of each phase without providing separate sensors for identifying the position of the rotor includes a motor driving part for driving the motor by exciting phases of the motor in a predetermined sequence, a differentiating part for differentiating the currents exciting the phases of the motor respectively, an amplifying part for amplifying output voltages from the differentiating part to proper levels, and a comparing part for comparing output voltages of the amplifying part with reference voltages respectively to generate a high level signal when the output voltage of the amplifying part is higher than the reference voltage and a low level signal when the output voltage of the amplifying part is lower than the reference voltage.
Inventors
- 👤 Jun Y. Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
A switch for a sensorless switched reluctance motor comprising: motor driving means for driving the motor by exciting phases of the motor with current in a predetermined sequence; filtering means for filtering the current exciting the phases of the motor; first amplifying means for amplifying output voltages from said filtering means to respective first proper levels; first comparing means for comparing output voltages of said first amplifying means with first references voltages respectively, to generate a high level signal when the output voltage of said first amplifying means is higher than the respective first reference voltage and a low level signal when the output voltage of said first amplifying means is lower than the respective first reference voltage; delaying means for delaying the output voltages from said filtering means for predetermined times; second amplifying means for amplifying the output voltages from said delaying means to respective second proper levels; second comparing means for comparing output voltages from said second amplifying means with second reference voltages respectively, to generate a high level signal when the output voltage of said second amplifying means is higher than the respective second reference voltage and a low level signal when the output voltage of said second amplifying means is lower than the respective second reference voltage; and OR gating means for ORing the output signals from said first comparing means and the output signals from said second comparing means.
Claim 2
Dependent Claim
234 words
A switch for a sensorless switched reluctance motor comprising: motor driving means for driving the motor by exciting phases of the motor with current in a predetermined sequence; filtering means for filtering the current exciting the phases of the motor; first amplifying means for amplifying output voltages from said filtering means to respective first proper levels; first comparing means for comparing output voltages of said first amplifying means with first references voltages respectively, to generate a high level signal when the output voltage of said first amplifying means is higher than the respective first reference voltage and a low level signal when the output voltage of said first amplifying means is lower than the respective first reference voltage; delaying means for delaying the output voltages from said filtering means for predetermined times; second amplifying means for amplifying the output voltages from said delaying means to respective second proper levels; second comparing means for comparing output voltages from said second amplifying means with second reference voltages respectively, to generate a high level signal when the output voltage of said second amplifying means is higher than the respective second reference voltage and a low level signal when the output voltage of said second amplifying means is lower than the respective second reference voltage; and OR gating means for ORing the output signals from said first comparing means and the output signals from said second comparing means.
Claim 3
Dependent Claim
24 words
A switch for a sensorless switched reluctance motor as claimed in claim 1, wherein said OR gating means includes a plurality of OR gates.
Claim 4
Dependent Claim
244 words
A switch for a sensorless switched reluctance motor comprising: motor driving means for driving the motor by exciting phases of the motor in a predetermined sequence; adding means for adding the current of each phase; low pass filtering means for filtering the output signals from said adding means; first amplifying means for amplifying output voltages from said low pass filtering means to respective first proper levels; first comparing means for comparing output voltages of said first amplifying means with first reference voltages respectively, to generate a high level signal when the output voltage of said first amplifying means is higher than the respective first reference voltage and a low level signal when the output voltage of said first amplifying means is lower than the respective first reference voltage; delaying means for delaying the output voltages from said filtering means for predetermined times; second amplifying means for amplifying the output voltages from said delaying means to respective second proper levels; second comparing means for comparing output voltages from said second amplifying means with second reference voltages respectively, to generate a high level signal when the output voltage of said second amplifying means is higher than the respective second reference voltage and a low level signal when the output voltage of said second amplifying means is lower than the respective second reference voltage; and OR gating means for ORing the output signals from said first comparing means and the output signals from said second comparing means.
Claim 5
Dependent Claim
244 words
A switch for a sensorless switched reluctance motor comprising: motor driving means for driving the motor by exciting phases of the motor in a predetermined sequence; adding means for adding the current of each phase; low pass filtering means for filtering the output signals from said adding means; first amplifying means for amplifying output voltages from said low pass filtering means to respective first proper levels; first comparing means for comparing output voltages of said first amplifying means with first reference voltages respectively, to generate a high level signal when the output voltage of said first amplifying means is higher than the respective first reference voltage and a low level signal when the output voltage of said first amplifying means is lower than the respective first reference voltage; delaying means for delaying the output voltages from said filtering means for predetermined times; second amplifying means for amplifying the output voltages from said delaying means to respective second proper levels; second comparing means for comparing output voltages from said second amplifying means with second reference voltages respectively, to generate a high level signal when the output voltage of said second amplifying means is higher than the respective second reference voltage and a low level signal when the output voltage of said second amplifying means is lower than the respective second reference voltage; and OR gating means for ORing the output signals from said first comparing means and the output signals from said second comparing means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
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