Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 5459654 | Apparatus for generating positive and negative supply rails from operating motor control circuit A motor control circuit is used to generate positive and negative voltage supply rails. The motor control circuit contains two halfbridges, each of which contains a pair of MOSFETs connected in series, each of the MOSFETs being formed without the customar... | 10/17/1995 |
| 5384524 | Voice coil motor control circuit and method for servo system control in a computer mass storage device A voice coil motor ("VCM") control circuit controls operation of a VCM which positions a disk drive head/actuator arm assembly. A data processor is continuously updated with the current position and relative radial velocity of the disk drive head/actuator... | 01/24/1995 |
| 5379209 | Electronic switching circuit A pulse-width modulated (PWM) circuit provides current through a load by opening and closing main electronic switches which connect the load to a power supply. Each main electronic switch connects with an auxiliary switch, connected in series with a diode... | 01/03/1995 |
| 5367600 | Motor control for a treadmill having improved power supply and improved speed regulation under intermittent loading A motor control for a treadmill has an improved, inexpensive, and simple set of power supplies, derived from the bus voltages of the DC busses with simple voltage dividers, to supply operational amplifiers connected to the positive DC voltage bus with a d... | 11/22/1994 |
| 5351336 | Motor control having improved speed regulation under intermittent loading A control for energizing a DC motor to provide improved speed regulation to the motor under transient conditions. The control includes a regulating circuit having an output signal controlling the armature voltage applied to the motor. An input speed refer... | 09/27/1994 |
| 5323095 | Propulsion and electric braking system for electric traction motor vehicle A system and method for controlling power transfer between an internal combustion driven electrical power generator and a direct current (DC) motor. In one form, the invention includes control of a power inverter in a manner to restrict current through a ... | 06/21/1994 |
| 5287046 | Method and system for actuator control for direct access storage devices A method of operating bridge circuit for control of an inductive load is disclosed. The bridge circuit has a pair of input terminals for connection across a power source and a pair of output terminals for connection across the inductive load. Each arm of ... | 02/15/1994 |
| 5081409 | Pulse-width modulated circuit for driving a load A pulse-width modulated (PWM) circuit applies a voltage across a load in accordance with a PWM command signal. The command signal is converted into first and second trains of pulses, by electronically comparing the command signal with a triangular dither ... | 01/14/1992 |
| 5070292 | Pulse-width modulated circuit for driving a load A pulse-width modulated circuit applies a voltage across a load in accordance with a command signal. The command signal is converted into first and second trains of pulses, by electronically comparing the command signal, and its inverse, with a triangular... | 12/03/1991 |
| 4845413 | Device for controlling the field current of DC motors A device for controlling the field current of a DC motor supplied from an AC network and which is operated beyond the normal speed of the DC motor in the higher speed range obtainable by weakening of the field of the DC motor, there being provided for the... | 07/04/1989 |
| 4742281 | Speed control apparatus for a DC motor A speed control apparatus for a DC motor operable with a low voltage battery has a reference voltage generating circuit capable of operable with a low voltage such as 1 V and is settable for output voltage and for temperature coefficient independently eac... | 05/03/1988 |
| 4645991 | Apparatus for removing torque ripples in direct-current motors An apparatus for removing torque ripples comprises a permanent magnet rotor, position sensors, stator armature coils, an operational circuit for effecting an arithmetic operation on detected signals from the position sensors, and a control circuit for dri... | 02/24/1987 |
| 4527104 | Speed control apparatus for d.c. motor A speed control apparatus for a d.c. motor includes a bridge circuit which operates to detect a speed error signal. The speed error signal is applied to a Schmidt trigger circuit, an output of which is used to cause a switching operation of a power supply... | 07/02/1985 |
| 4477752 | Speed control apparatus for DC motor A speed control apparatus for DC motor (1), comprises a bridge circuit formed by the winding of the motor (1), a resistor (2) series thereto, and two resistors (3 and 4). Therein, a reference voltage (Er) is produced by dividing a voltage V | 10/16/1984 |
| 4353017 | Velocity compensation for limited displacement motors A velocity-compensation circuit for a limited-displacement motor comprises a bridge circuit incorporating the control winding of the motor in a first arm. An adjacent bridge arm includes both an inductance and a resistance whose ratio is the same as that ... | 10/05/1982 |
| 4303874 | Motor speed control system Disclosed is a motor speed control system, in which a detected induced voltage of a motor under speed control is compared with a velocity reference signal which is a sawtooth wave voltage synchronized with a power supply frequency. The motor speed control... | 12/01/1981 |
| 4274036 | Rotational speed control circuit for a D.C. motor A rotational speed control circuit for a D.C. motor includes a power transistor with its emitter-collector path connected in series with the D.C. motor and a power supply. A base current of the power transistor is controlled by an output of a differential... | 06/16/1981 |
| 4218640 | Tachometric measuring device for direct-current motors, and motor equipped with such a device A stationary device for sensing the rotational speed of electric motors, comprising an impedance bridge circuit, the motor being inserted into one branch of the bridge in series with a resistive element, and a voltage proportional to the rotational speed ... | 08/19/1980 |
| 4168454 | Circuit arrangement for controlling the speed of a D.C. motor A circuit arrangement for controlling the speed of a D.C. motor, and particularly a motor for operating dental instruments. The circuit arrangement comprises a reference signal generator, a comparator which compares the reference signal with a second sign... | 09/18/1979 |
| 4163182 | Actuating circuit for D.C. motor A D.C. motor control circuit including a wheatstone bridge type speed regulating circuit with a transistor arranged for detection of the counter-EMF developed across the motor armature to control operation of a drive control circuit. In one embodiment of ... | 07/31/1979 |
| 4145642 | System for controlling the rotation of a DC motor A system for controlling the rotation of a direct current motor has an armature resistance control circuit. An operational amplifier has one input terminal connected to the direct current motor and another input terminal connected to form a differential a... | 03/20/1979 |
