Patent US3585474A successfully refreshed from Google Patents.
US3585474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic commutating system and electronically commutated motor
Assignee: Panasonic Holdings Corp
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Filing: 1969-02-28
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Granted: 1971-06-15
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Expires: 1989-02-28
Abstract
Abstract An electronic commutating system and an electronically commutated motor resulting therefrom. The electronic commutating system has no deadzone and no overlap despite an imperfect position detecting signal. The transition of the commutation is carried out in a differential manner. Any fluctuation in the operating temperature and/or deviation of the supply voltage does not disturb the commutation. The electronically commutated motor utilizing said electronic commutating system starts properly and with a very small torque ripple. The motor also has a high efficiency.
Inventors
- 👤 Kazutsugu Kobayashi
- 👤 Hisayuki Matsumoto
- 👤 Yoshiaki Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:47
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
285 words
An electric motor apparatus comprising: stator windings mounted for generating magnetic fields in selected areas; a permanently magnetized rotor moveably mounted adjacent said stator windings for rotation within said magnetic fields; a position detecting means coupled to said rotor for detecting the relative rotational position of said stator windings and said rotor, said position detecting means including voltage generating means for generating a family of voltage having values varying according to said rotational position; a pedestal voltage generating means; a plurality of transistors; an impedance means, said impedance means having two terminals, the emitters of said transistors beinG connected to one terminal of said impedance means for causing the emitter current of said transistors to flow through said impedance means, said voltage generating means being coupled to the bases of said transistors for supplying the family of voltages generated by said voltage generating means to the bases of said transistors, said pedestal voltage generating means being coupled to said means for generating a family of voltages to bias said family of voltages by said pedestal voltage the means for generating the family of voltages and the pedestal voltage generating means being coupled across the bases of said transistors and the other terminal of said impedance means for applying the total voltage of said voltages in said family of voltages and said pedestal voltage between the bases of said transistors and the other terminal of said impedance means; switching means coupled between the collectors of said transistors and the respective stator windings, the collector currents being utilized for the switching of the current to said stator windings; and a power supply coupled to said stator windings through said switching means and coupled to said impedance means.
Claim 2
Dependent Claim
285 words
An electric motor apparatus comprising: stator windings mounted for generating magnetic fields in selected areas; a permanently magnetized rotor moveably mounted adjacent said stator windings for rotation within said magnetic fields; a position detecting means coupled to said rotor for detecting the relative rotational position of said stator windings and said rotor, said position detecting means including voltage generating means for generating a family of voltage having values varying according to said rotational position; a pedestal voltage generating means; a plurality of transistors; an impedance means, said impedance means having two terminals, the emitters of said transistors beinG connected to one terminal of said impedance means for causing the emitter current of said transistors to flow through said impedance means, said voltage generating means being coupled to the bases of said transistors for supplying the family of voltages generated by said voltage generating means to the bases of said transistors, said pedestal voltage generating means being coupled to said means for generating a family of voltages to bias said family of voltages by said pedestal voltage the means for generating the family of voltages and the pedestal voltage generating means being coupled across the bases of said transistors and the other terminal of said impedance means for applying the total voltage of said voltages in said family of voltages and said pedestal voltage between the bases of said transistors and the other terminal of said impedance means; switching means coupled between the collectors of said transistors and the respective stator windings, the collector currents being utilized for the switching of the current to said stator windings; and a power supply coupled to said stator windings through said switching means and coupled to said impedance means.
Claim 3
Dependent Claim
29 words
An electric motor apparatus as claimed in claim 1 in which said pedestal voltage generating means generates a pedestal voltage having a value proportional to the power supplying voltage.
Claim 4
Dependent Claim
49 words
An electric motor apparatus as claimed in claim 1 in which said pedestal voltage generating means and said means for generating said family of voltages is a single voltage operating means for producing a family of voltages having a large means value which effectively operates as the pedestal voltage.
Claim 5
Dependent Claim
111 words
An electric motor apparatus as claimed in claim 1 in which said position detecting means comprises a primary winding, a plurality of secondary windings around said primary winding, a position detecting rotor to which said primary winding is electrically coupled, said position detecting rotor being mechanically coupled to said magnetized rotor for movement in synchronization therewith, high frequency voltage supply means coupled to said primary winding for supplying a comparatively high frequency alternating current to said primary winding, said secondary windings producing an AC voltage output, and rectifying and filtering means coupled to said secondary windings for obtaining an envelope of the voltage of said AC output of the secondary windings.
Claim 6
Dependent Claim
45 words
An electric motor apparatus as claimed in claim 1 in which said impedance means has resistive and capacitive properties, and further comprising filter means coupled to the collectors of said transistors for filtering out the AC current inherent in the collector current of each transistor.
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |