Patent US5249243A successfully refreshed from Google Patents.
Patent US3715643A successfully refreshed from Google Patents.
US3715643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically driven motor
Assignee: Yamato Sewing Machine Mfg Co Ltd
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Filing: 1971-03-24
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Granted: 1973-02-06
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Expires: 1991-03-24
Abstract
Abstract An electrically driven motor that can be rapidly rotated and stopped at a predetermined position about its own axis of rotation. To this end, the motor is provided with a rotational shaft rigidly mounted with a rotary magnet in coaxial relation to the rotor, said rotary magnet being adapted to be magnetized in one predetermined direction to produce a a magnetic force acting on the rotor so as to stop said rotor at a predetermined position about its own axis of rotation.
Inventors
- 👤 K Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:24
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/10; D05B69/12; H; H02; H02K; H02K23/00; H02K23/66
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
An electrically driven motor comprising a rotor wound with a winding, means for producing a magnetic field surrounding said rotor, said magnetic field producing means comprising a plurality of field coils and further including means for connecting said field coils in series with each other during a period beginning from the commencement of rotation of said rotor until the termination of high-speed rotation of said rotor and connecting said field coils in parallel to each other when the supply of current to said winding of said rotor and said field coils is cut off whereby an electromotive power produced by said rotor that has been rotated under the influence of an inertia force is permitted to flow to said field coils connected in parallel to each other, means for feeding current to the winding of said rotor so as to continuously rotate said rotor in one direction, a rotary magnet rigidly mounted on a rotational sHaft of said rotor in a spaced relation with respect to said rotor and normally magnetized one predetermined direction and means for stopping said rotor, that has been rotated, at a predetermined position about its own axis of rotation in cooperation with said rotary magnet emanating a magnetically-attracting force acting on said rotor.
Claim 2
Dependent Claim
208 words
An electrically driven motor comprising a rotor wound with a winding, means for producing a magnetic field surrounding said rotor, said magnetic field producing means comprising a plurality of field coils and further including means for connecting said field coils in series with each other during a period beginning from the commencement of rotation of said rotor until the termination of high-speed rotation of said rotor and connecting said field coils in parallel to each other when the supply of current to said winding of said rotor and said field coils is cut off whereby an electromotive power produced by said rotor that has been rotated under the influence of an inertia force is permitted to flow to said field coils connected in parallel to each other, means for feeding current to the winding of said rotor so as to continuously rotate said rotor in one direction, a rotary magnet rigidly mounted on a rotational sHaft of said rotor in a spaced relation with respect to said rotor and normally magnetized one predetermined direction and means for stopping said rotor, that has been rotated, at a predetermined position about its own axis of rotation in cooperation with said rotary magnet emanating a magnetically-attracting force acting on said rotor.
Claim 3
Dependent Claim
208 words
An electrically driven motor comprising a rotor wound with a winding, means for producing a magnetic field surrounding said rotor, said magnetic field producing means comprising a plurality of field coils and further including means for connecting said field coils in series with each other during a period beginning from the commencement of rotation of said rotor until the termination of high-speed rotation of said rotor and connecting said field coils in parallel to each other when the supply of current to said winding of said rotor and said field coils is cut off whereby an electromotive power produced by said rotor that has been rotated under the influence of an inertia force is permitted to flow to said field coils connected in parallel to each other, means for feeding current to the winding of said rotor so as to continuously rotate said rotor in one direction, a rotary magnet rigidly mounted on a rotational sHaft of said rotor in a spaced relation with respect to said rotor and normally magnetized one predetermined direction and means for stopping said rotor, that has been rotated, at a predetermined position about its own axis of rotation in cooperation with said rotary magnet emanating a magnetically-attracting force acting on said rotor.
Claim 4
Dependent Claim
208 words
An electrically driven motor comprising a rotor wound with a winding, means for producing a magnetic field surrounding said rotor, said magnetic field producing means comprising a plurality of field coils and further including means for connecting said field coils in series with each other during a period beginning from the commencement of rotation of said rotor until the termination of high-speed rotation of said rotor and connecting said field coils in parallel to each other when the supply of current to said winding of said rotor and said field coils is cut off whereby an electromotive power produced by said rotor that has been rotated under the influence of an inertia force is permitted to flow to said field coils connected in parallel to each other, means for feeding current to the winding of said rotor so as to continuously rotate said rotor in one direction, a rotary magnet rigidly mounted on a rotational sHaft of said rotor in a spaced relation with respect to said rotor and normally magnetized one predetermined direction and means for stopping said rotor, that has been rotated, at a predetermined position about its own axis of rotation in cooperation with said rotary magnet emanating a magnetically-attracting force acting on said rotor.
Claim 5
Dependent Claim
38 words
An electrically driven motor according to claim 1, wherein said rotary magnet comprises an electromagnet adapted to receive current from a power source through a plurality of slip rings coaxially mounted on the rotational shaft of the rotor.
Claim 6
Dependent Claim
17 words
An electrically driven motor according to claim 2, wherein said rotary magnet is integrally formed with rotor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |