Drive device for motor
Abstract
Abstract In a motor control device, an electric circuit responsive to a mode selection signal for determining whether or not an electric motor is driven is constructed with two field-effect transistors. A source terminal of the first field-effect transistor is connected to one of terminals of the motor, and a source terminal of the second field-effect transistor is connected to the other terminal of the motor. The mode selection signal is applied to the gate terminal of each of the two field-effect transistors. The drain terminal of the first field-effect transistor is connected to the output of a circuit for generating a drive signal for driving the motor, and the drain terminal of the second field-effect transistor is grounded. The accuracy of control is not lowered as the number of cycles of changing operation over between the manual and motor-driven modes increases, and the electric power is less consumed in each cycle over.
Inventors
- 👤 Michihiro Akiike
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |