US5227702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current motor utilizing back electromotive force
Assignee: Individual
•
Filing: 1991-09-19
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Granted: 1993-07-13
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Expires: 2011-09-19
Abstract
Abstract A dual voltage direct current permanent magnet brushless motor operated by sequential and alternate pulses to two rows of stator coils radially and equally positioned in the stato assembly to interact with two rows of permanent magnets equally spaced on the rotor. All the permanent magnets in one row are poled opposite to all the permanent magnets in the other row and total one less than the number of stator coils in each row. The reversal of poles of one row of permanent magnets on the rotor, along with the equal and opposite voltage permits the back electromotive force from a de-energizing stator coil in the first row to feed energy to the next stator coil positioned on the opposite site of the rotor (and vice versa) which interact with the reverse poled permanent magnet to produce only useful torque. Additional energy will be drawn from the battery as required to maintain the speed and torque requirement of the motor. The pulse to each stator is controlled by individual photocell detectors or Hall effect devices. The arrangement and control of the stator coils also permits power generation in the braking mode. The dual equal and opposite drive voltage permits the use of identical solid state switching devices in each side of the circuitry as well as utilization of the lowest possible peak inverse voltage rated devices as a result of the connection used between the stator coils.
Inventors
- 👤 Peter M. Nahirney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:57
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/141; H02P; H02P6/00; H02P6/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
505 words
An electric motor comprising stator means, rotor means mounted for rotation relative to the stator means about an axis, a first set of electromagnets mounted on one of the rotor means and the stator means in equi-angularly spaced positions around the axis, a first set of permanent magnets mounted on the other of the rotor means and stator means in equi-angularly spaced positions around the axis and arranged such that rotation of the rotor means relative to the stator means causes each permanent magnet of the first set to come sequentially into cooperating position with each in turn of electromagnets of the first set, the number of permanent magnets of the first set being different by an odd number from the number of electromagnets of the first set, first feeding means for feeding pulsed voltages to the electromagnets of the first set to cause a force on the permanent magnets of the first set tending to rotate the rotor means about the axis in a predetermined direction, a second set of electromagnets mounted on one of the rotor means and the stator means in equi-angularly spaced positions around the axis, a second set of permanent magnets mounted on the other of the rotor means and stator means at equi-angularly spaced positions around the axis, and arranged such that rotation of the rotor means causes each permanent magnet of the second set to come sequentially into cooperating position with each in turn of electromagnets of the second set, the number of permanent magnets of the second set being different by an odd number from the number of electromagnets of the second set, second feeding means for feeding pulsed voltages to each of the electromagnets of the second set to cause a force on the permanent magnets of the second set tending to rotate the rotor about the axis in said predetermined direction, the electromagnets of the second set being spaced from the first set such that the permanent magnets of each of the first and second sets cooperate only with the electromagnets of the first and second sets respectively, the poles of the permanent magnets of the first set being reversed relative to the poles of the permanent magnets of the second set, the voltage applied to said first set of electromagnets being of opposite polarity relative to the voltage applied to the second set of electromagnets, the number of electromagnets in the first set being equal to the number of electromagnets in the second set and the number of permanent magnets in the first set being equal to the number of permanent magnets in the second set, the electromagnets of the first set being angularly offset from the electromagnets of the second set and means for communicating current generated by the collapsing field of each electromagnet of each one of the sets to a respective one of electromagnets of the other one of the sets to tend to generate in said respective one of electromagnets of the other one of the sets said pulsed voltage.
Claim 2
Dependent Claim
505 words
An electric motor comprising stator means, rotor means mounted for rotation relative to the stator means about an axis, a first set of electromagnets mounted on one of the rotor means and the stator means in equi-angularly spaced positions around the axis, a first set of permanent magnets mounted on the other of the rotor means and stator means in equi-angularly spaced positions around the axis and arranged such that rotation of the rotor means relative to the stator means causes each permanent magnet of the first set to come sequentially into cooperating position with each in turn of electromagnets of the first set, the number of permanent magnets of the first set being different by an odd number from the number of electromagnets of the first set, first feeding means for feeding pulsed voltages to the electromagnets of the first set to cause a force on the permanent magnets of the first set tending to rotate the rotor means about the axis in a predetermined direction, a second set of electromagnets mounted on one of the rotor means and the stator means in equi-angularly spaced positions around the axis, a second set of permanent magnets mounted on the other of the rotor means and stator means at equi-angularly spaced positions around the axis, and arranged such that rotation of the rotor means causes each permanent magnet of the second set to come sequentially into cooperating position with each in turn of electromagnets of the second set, the number of permanent magnets of the second set being different by an odd number from the number of electromagnets of the second set, second feeding means for feeding pulsed voltages to each of the electromagnets of the second set to cause a force on the permanent magnets of the second set tending to rotate the rotor about the axis in said predetermined direction, the electromagnets of the second set being spaced from the first set such that the permanent magnets of each of the first and second sets cooperate only with the electromagnets of the first and second sets respectively, the poles of the permanent magnets of the first set being reversed relative to the poles of the permanent magnets of the second set, the voltage applied to said first set of electromagnets being of opposite polarity relative to the voltage applied to the second set of electromagnets, the number of electromagnets in the first set being equal to the number of electromagnets in the second set and the number of permanent magnets in the first set being equal to the number of permanent magnets in the second set, the electromagnets of the first set being angularly offset from the electromagnets of the second set and means for communicating current generated by the collapsing field of each electromagnet of each one of the sets to a respective one of electromagnets of the other one of the sets to tend to generate in said respective one of electromagnets of the other one of the sets said pulsed voltage.
Claim 3
Dependent Claim
29 words
The motor according to claim 1 wherein the number of permanent magnets of the first set is less than the number of electromagnets of the first set by one.
Claim 4
Dependent Claim
15 words
The motor according to claim 1 wherein the first and second sets are axially spaced.
Claim 5
Dependent Claim
21 words
The motor according to claim 1 including microprocessor controlled switch means controlling said voltage pulses and controlling communication of said current.
Claim 6
Dependent Claim
13 words
The motor according to claim 4 wherein the switch means is solid state.
Claim 7
Dependent Claim
39 words
The motor according to claim 1 wherein the voltage pulses for the first set are generated from a DC voltage and wherein the voltage pulses for the second set are generated from an equal DC voltage of opposite polarity.
Claim 8
Dependent Claim
42 words
The motor according to claim 1 wherein said communicating means is arranged to communicate said current from said each electromagnet to said electromagnet of the other one of the sets which is next adjacent in an angular direction to said each electromagnet.
Claim 9
Dependent Claim
16 words
The motor according to claim 1 including means for adjusting the length of the voltage pulses.
Claim 10
Dependent Claim
55 words
The motor according to claim 1 wherein said first and second feeding means are each arranged to apply voltage to the respective electromagnets, which voltage can be adjusted from a positive voltage to a negative voltage to change the cooperation between the permanent magnets and the electromagnets between a repulsion mode and an attraction mode.
Claim 11
Dependent Claim
28 words
The motor according to claim 1 including position location means for detecting the relative positions between the permanent magnets and the electromagnets for timing of the voltage pulses.
Claim 12
Dependent Claim
16 words
The motor according to claim 10 wherein the position location means includes a hall effect device.
Claim 13
Dependent Claim
15 words
The motor according to claim 10 wherein the position location means includes a photo cell.
Claim 14
Dependent Claim
20 words
The motor according to claim 1 wherein said first and second feeding means each include means for shaping the pulses.
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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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |