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| Number | Title | Issue Date |
| 5767537 | Capacitively triggered silicon controlled rectifier circuit An SCR circuit formed on a semiconductor substrate includes a well region, a first diffusion region and a second diffusion region in the well region, and a third diffusion region in the substrate. The SCR circuit also includes a capacitor connected betwee... | 06/16/1998 |
| 5714861 | Variable speed control for a hand-held electric power tool A power tool has a variable speed control circuit that comprises a user switch, a motor and a silicon controlled rectifier (SCR) connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electr... | 02/03/1998 |
| 5537012 | DC motor control circuit and DC motor A DC motor control circuit for controlling a restraint torque of a DC motor which continues the rotation by triggering an external force. This control circuit is installed in a DC motor. In a DC motor control circuit comprising a drive transistor collecto... | 07/16/1996 |
| 5512810 | Variable speed control for a hand-held electric power tool A power tool has a variable speed control circuit that comprises a user switch, a motor and a thyristor connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electrode of the thyristor and ... | 04/30/1996 |
| 5086491 | Electronic control circuit for A/C motors A control circuit for alternating current motors comprises a bidrectional controlled diode (TRIAC) connected in series to the motor and with its own control terminal connected to a fixed-phase actuating network in order to supply partial power to the moto... | 02/04/1992 |
| 5077823 | Electric motor starting circuit The invention provides a cushioning control circuit which restricts the initial flow of current to a D.C. permanent magnet motor by providing a neon control lamp in series with a pair of triac control circuits which drops the initial voltage imposed on th... | 12/31/1991 |
| 4748389 | Motor speed control apparatus The motor speed control apparatus of the present invention includes a thyristor (14) connected in the current supply circuit of a motor (13) for phase controlling the motor to control its rotational speed. The determination of the trigger timing of the th... | 05/31/1988 |
| 4736142 | Speed control system for electric motor A speed-control system for an electric motor comprises a circuit for setting a desired motor speed and providing a speed-control signal, a circuit for sensing motor voltage and providing a motor voltage-related signal, a circuit for sensing current flow i... | 04/05/1988 |
| 4722021 | Safety circuit for hand tools, and method for safe operation thereof To detect if a tool bit, such as a drill, a saw blade, or the like, upon being worked into a wall, meets a metallic obstruction, such as a conduit, reinforcement rod, hydraulic pipe or the like, an alternating voltage, preferably between 2 and 20 kHz, is ... | 01/26/1988 |
| 4684856 | Method and drive for elevator DC drive motor stabilization A method and device for elevator DC drive motor speed control stabilization system in which current data and speed data are used as feed-back information. The current regulator is approximated by an ideal integrator, and mathematical model thereby obtaine... | 08/04/1987 |
| 4524403 | Washing machine motor speed control circuit In washing machine control circuits of the type in which a semiconductor controlled rectifier SCR is arranged in series with the motor M in order to control the speed of the motor, a short circuit fault of the SCR can result in damage to the machine. A bi... | 06/18/1985 |
| 4447767 | SCR Motor speed control Apparatus is disclosed for controlling the duty ratio of the application of an energization source such as a battery to a load in the form of a motor for driving a vehicle. More particularly, there is disclosed a motor control implemented by solid state d... | 05/08/1984 |
| 4392093 | Electronic control and regulating system An electronic control and regulating system for AC-operated appliances, especially universal motors and with symmetrical phase control. The control circuit includes among other things an inductive current-voltage converter 9, the primary side 8 of which i... | 07/05/1983 |
| 4390824 | Full wave motor control circuit A full wave motor control circuit is provided which utilizes a phase fired SCR to control the flow of current through the motor windings. Just before the end of each cycle, the charging capacitor which is connected across the gate and cathode of the SCR i... | 06/28/1983 |
| 4390823 | Motor control system incorporating top speed limiting arrangement An SCR motor speed control system having a capacitor for triggering the SCR into conduction is provided with circuitry for limiting the top speed of the motor by sensing the armature back EMF generated during the non-conducting period of the SCR to determ... | 06/28/1983 |
| 4292571 | Control device for controlling the rotational speed of a portable power tool A speed control device for portable power tools having particular applicability to electric drills. The speed control device is adapted to automatically adjust the speed of the motor in accordance with changes in the diameter of the tool bit used. The dev... | 09/29/1981 |
| 4284938 | Chopper with adaptive energy commutation Apparatus for controlling the voltage on a commutating capacitor in a thyristor time ratio control power circuit whereby the energy stored in the capacitor may be continuously adjusted to a magnitude required for commutation so that the size of the commut... | 08/18/1981 |
| 4274037 | Motor speed control system A speed control system for a motor comprises a main motor circuit for supplying the motor current to the motor from an AC power supply via a main switch, a full-wave rectifier circuit and a semiconductor element with a control electrode, variable voltage ... | 06/16/1981 |
| 4247808 | Method and apparatus for varying the speed of DC motors The commutator or commutators of a DC motor are uniquely arranged with a plurality of peripherally spaced, current carrying segments separated by relatively large, electrically dead, non-conducting spaces, each of the dead spaces being at least as wide in... | 01/27/1981 |
| 4236103 | Control circuit for a direct current motor A control circuit for a direct current electric motor including a rectifying bridge for supplying the motor with direct current and a regulating circuit including a triac, the energizing angle of which is determined by a capacitor connected in series with... | 11/25/1980 |
| 4232258 | Speed control apparatus for electric motor A direct current obtained by rectifying an alternating current voltage by means of a diode bridge circuit is applied to a direct current motor connected to the diode bridge circuit. Use is made of the fact that the voltage developed across the diode bridg... | 11/04/1980 |
| 4199712 | Motor control system incorporating digital top speed limiting arrangement An SCR motor speed control system having a capacitor for triggering the SCR into conduction is provided with circuitry for limiting the top speed of the motor by sensing the time of a predetermined proportion of a motor revolution to determine the motor s... | 04/22/1980 |
| 4172989 | Speed control device for a sewing machine A speed control device for a sewing machine includes at least means for providing a speed reference voltage signal, means for producing a motor speed voltage signal responsive to an actual speed of the driving motor, and means for comparing the speed refe... | 10/30/1979 |
| 4172232 | Electric vehicle traction motor control An electric vehicle traction motor control circuit includes a main thyristor in series with a fuse, and the armature of the motor. A second thyristor and a commutating capacitor are connected in series across the series combination of the main thyristor a... | 10/23/1979 |
| 4170749 | Speed control circuit for a series motor A speed control circuit for a series motor is disclosed which keeps the rotational speed of a motor constant by detecting the slight change of an electromotive force caused by the change of the load motor. A gate signal from a trigger signal generating el... | 10/09/1979 |
| 4168455 | Motor speed control system A speed control system for a motor comprising a main motor circuit supplying motor current to the motor from an A.C. power source through a semiconductor element provided with a control electrode, trigger voltage supplying means supplying trigger voltage ... | 09/18/1979 |
| 4137490 | Trigger speed control switch A speed control subassembly is made by providing a generally flat heat sink plate having a laterally-formed collector strip at its upper edge. A double-sided-adhesive insulator tape strip is stuck to the heat sink, this tape having a hole large enough to ... | 01/30/1979 |
| 4087726 | Constant-frequency current choppers for low-rate supply of an inductive load In a constant frequency chopper for low-rate supply for an inductive load, a cut-off capacitor discharge circuit is added which shunts the cut-off capacitor and which, when the motor is required to operate at a low rate, helps to bypass the excess energy ... | 05/02/1978 |
| 3993942 | Forced commutation chopper having current limit A forced commutation chopper control for regulating speed of a DC series tractive motor limits peak motor current by sensing the voltage across the commutation capacitor during the on-time of the current pulses and gating the commutation SCR on in respons... | 11/23/1976 |
| 3962615 | Multiple mode variable speed motor control circuit A multiple mode variable speed motor control circuit is provided having a master control switch for applying a source of AC potential to the circuit. A diode rectifies the source for applying a DC potential across a string of resistors from which a contro... | 06/08/1976 |
| 3956688 | Remote control phase shift circuit for thyristor A control circuit for a motor includes a thyristor connected to apply current to the motor, and a phase shift circuit for controlling the thyristor including a series RC circuit connected in parallel with the thyristor. The junction of the resistor and ca... | 05/11/1976 |
