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| Number | Title | Issue Date |
| 7398012 | Method for powering mining equipment Certain exemplary embodiments can include a static DC electric drive system for mining equipment. The drive system can include: an active front end adapted to receive an AC voltage and output a substantially constant DC voltage; and a DC chopper coupled to the activ... | 07/08/2008 |
| 7386224 | DC brushless fan motor driving circuit A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sin... | 06/10/2008 |
| 7276878 | Amperage control for protection of battery over current in power tools Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply may include a battery ... | 10/02/2007 |
| 7277289 | Resistor for controlling a fan motor rotating speed for use in an air conditioner Provided is a resistor for controlling a fan motor rotating speed for use in an air conditioner. The resistor comprises a base body, a radiator attached to a top portion of the base body, a printed resistor circuit board covered with insulating sheets and received w... | 10/02/2007 |
| 7253541 | Power hand tool having a proximity detector The present invention provides a power tool with a hand proximity detector to detect the hand of an operator and a trigger circuit operable with the detector to control the operation of a light in the housing or to provide a safety lockout function. ... | 08/07/2007 |
| 7230396 | Device method for switching of currents in a stator winding of a generator-electric motor combination The invention relates to a device and a method for switching currents in a stator winding (1) of a generator/electric motor combination, said stator winding (1) comprising at least one winding which can be short-circuited or switched in a highly-resist... | 06/12/2007 |
| 7133601 | Amperage control for protection of battery over current in power tools Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply preferably includes a ... | 11/07/2006 |
| 7123821 | DC motor A DC motor includes a power source, a stator and a rotor. Permanent magnets are mounted to either the stator or the rotor. Electromagnets are mounted to the other of either the stator or the rotor. Each electromagnet includes two coils which are each branched with a... | 10/17/2006 |
| 7112934 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to ro... | 09/26/2006 |
| 7053574 | Mirror angle control apparatus for vehicular electric mirror assembly As a vertical motion motor (M2) comprised of a brushless motor is driven to rotate in response to a control signal from a main controller (10), a pulse signal generated with the shape corresponding to the number of rotations of the vertical motion moto... | 05/30/2006 |
| 6938795 | Hand-held fluid dispenser system and method of operating hand-held fluid dispenser systems A hand-held fluid dispenser having an enclosure for supporting a container holding a fluid to be dispensed, and a method of operating such hand-held fluid dispensers. A first proximity sensor is located inside the enclosure immediately adjacent one side of the enclo... | 09/06/2005 |
| 6895176 | Method and apparatus for controlling electronically commutated motor operating characteristics A permanent magnet DC brushless motor control assembly permits a user to select the permanent magnet DC brushless motor operating characteristics by selecting appropriate control circuits to interface with the motor. The assembly includes a permanent magnet DC brush... | 05/17/2005 |
| 6693400 | Multi-mode motor controller chip set A multi-mode motor controller architecture includes a motor, an integrated circuit controller, and an integrated circuit driver circuit. The integrated circuit controller includes a pulse generator, a DAC, an ADC, and a digital compensator circuit. The in... | 02/17/2004 |
| 6449427 | Loading drive system Upon receipt of a reference voltage signal Vi and a multiplicity of logic control signals L1 and L2, the loading drive system converts the signals received into a first control voltage Vi1 and a second control voltage Vi2 in such that the voltage differen... | 09/10/2002 |
| 6353705 | Speed control circuit of a direct current motor A speed control circuit of a direct current motor comprises a switching regulator IC 10. The switching regulator IC 10 is composed of a reference voltage generator 12 which generates a reference voltage of 5V, a first operational amplifier OP1, a second o... | 03/05/2002 |
| 5754020 | Wiper-washer system for vehicles A wiper-washer system for vehicles comprises at least one wiper drivable by a wiper motor and a washer device which includes a water reservoir and a water pump motor. The wiper and water pump motors are activated through a switching arrangement. The wiper... | 05/19/1998 |
| 5408575 | Automotive fan controller A vehicle fan motor controller includes a simple planar ceramic base providing a plurality of printed resistors. The resistors include electrically conductive paths printed on the ceramic overcoated with a thick resistive film. The thick film substantiall... | 04/18/1995 |
| 4684859 | Chopper control system A novel control system for the motor or the like is disclosed which operates basically on principle that the power flowing in during the conduction of a chopper gate of a chopper device is integrated, and when the integrated value reaches a target, the ga... | 08/04/1987 |
| 4479079 | Apparatus for varying the speed of DC motors The commutator of a DC motor is uniquely constructed to include at least one dead segment at least as wide as the associated brush (brushes). A silicon controlled rectifier (SCR) is arrranged in the circuit between the voltage source and said brush (brush... | 10/23/1984 |
| 4288729 | Control system for D.C. electric motor A control system for a D.C. electric motor utilizing a Ward-Leonard rotation speed control system in which noise components in the input power to the motor are substantially eliminated. Switching means in the form of gate turning-off thyristors couples a ... | 09/08/1981 |
| 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 |
| 4225812 | Electric motor control system An electric motor of predetermined voltage rating is connected to an electric current supply source higher in voltage than the rated motor voltage in series with a voltage dropping resistor controlled by a thermal relay responsive to motor temperature. Th... | 09/30/1980 |
| 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 |
| 4121142 | Full-wave bidirectional DC motor drive circuit The present invention is a DC motor drive circuit in which each end of a center tapped supply transformer is connected through a pair of back-to-back thyristors to corresponding ends of a center tapped choke coil. The motor armature is connected between t... | 10/17/1978 |
| 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 |
| 3988656 | Motor speed control for power tool In a hand-held electric power tool, a combination including an electromotor, and an electric circuit for controlling the speed of the motor, including a pressure switch for controlling the motor speed, a first control potentiometer operatively associated ... | 10/26/1976 |
| 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 |
| 3935522 | Control device for the electric fan A control device for an electric fan comprising a power supply, a control means, a trigger pulse generator and a switch means, all connected in circuit with the motor of the electric fan, wherein the trigger pulse output of said trigger pulse generator is... | 01/27/1976 |
| 3931558 | SCR motor speed control system with trigger stabilization circuit A circuit is disclosed for controlling and regulating the speed of a D.C. motor fed from a single-phase A.C. supply. A full-wave power bridge using two diodes and two silicon controlled rectifiers (SCR's) supplies unfiltered rectified A.C. to the motor. A... | 01/06/1976 |
