Patent US3616677A successfully refreshed from Google Patents.
Patent US3584280A successfully refreshed from Google Patents.
US3584280A
Expired / Lapsed
US
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Transistor motor apparatus including current attenuation means
Assignee: Toshiba Corp
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Filing: 1969-04-01
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Granted: 1971-06-08
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Expires: 1989-04-01
Abstract
Abstract This transistor motor apparatus comprises a current attenuating means for introducing a slowly attenuated current through the windings of a motor stator when there occurs the rapid cutoff of current through transistors disposed between a DC source and a plurality of stator windings wound on a multiphase belt of a DC motor in corresponding relationship to said stator windings, thereby protecting the transistors, and preventing the mechanical vibrations of a transistor motor caused by variations in its torque moment.
Inventors
- 👤 Junpei Inagaki
- 👤 Susumu Tadakuma
- 👤 Shigeru Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/12; H02P6/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A transistorized motor apparatus comprising: a motor having a plurality of stator windings and a permanent magnet rotor; a source of DC potential; a plurality of driving transistors each serially connected between the DC source and a respective stator winding; approach switching means disposed in interlocking relationship with the permanent magnet rotor of the motor, said approach switching means issuing signals in accordance with the rotating position of the rotor to cause the driving transistors to be sequentially operated; and means to gradually attenuate the electric current flowing through the stator windings associated with said driving transistors when the signals from said approach switching means cause said driving transistors to be nonconducting, thereby preventing mechanical vibrations of the motor.
Claim 2
Dependent Claim
119 words
A transistorized motor apparatus comprising: a motor having a plurality of stator windings and a permanent magnet rotor; a source of DC potential; a plurality of driving transistors each serially connected between the DC source and a respective stator winding; approach switching means disposed in interlocking relationship with the permanent magnet rotor of the motor, said approach switching means issuing signals in accordance with the rotating position of the rotor to cause the driving transistors to be sequentially operated; and means to gradually attenuate the electric current flowing through the stator windings associated with said driving transistors when the signals from said approach switching means cause said driving transistors to be nonconducting, thereby preventing mechanical vibrations of the motor.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1 wherein said attenuation means includes a plurality of condensers, each being connected parallel to a respective driving transistor.
Claim 4
Dependent Claim
34 words
Apparatus according to claim 1 wherein said attenuating means includes a reactor serially connected to said DC source and a Zener diode selectively bypassing the electric current flowing through all of said driving transistors.
Claim 5
Dependent Claim
64 words
Apparatus according to claim 1 comprising a speed control means which includes means for detecting inverse electromotive forces generated in the stator windings and for smoothing out these forces, means for comparing the output voltage from said smoothing means with a predetermined value of voltage and varying the power supplied from the DC source to the approach switching means in accordance with said comparison.
Claim 6
Dependent Claim
29 words
Apparatus according to claim 1 wherein the approach switching means has a charging and discharging cirCuit which includes of a condenser and resistor connected parallel to the source circuit.
References Cited (Backward Citations)
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |