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| Number | Title | Issue Date |
| 7310475 | Motor driving apparatus A motor driving apparatus is provided which can minimize ripple current flowing through a DC link capacitor, and downsize the motor driving apparatus. It synchronizes the frequency of the inverter carrier signal for driving an inverter with the frequency of the DC/D... | 12/18/2007 |
| 6825625 | Device with an electromotor An arrangement having an electric motor (10) has a microcontroller (12) for influencing at least one motor function and a nonvolatile storage element (14) for storing at least one variable as a definition for that motor function. The arrangement... | 11/30/2004 |
| 5834916 | Industrial robot and its control unit A control unit for an industrial robot comprising a speed command device for outputting a speed command signal for the industrial robot and a servo control device which outputs to a servo motor of each of a plurality of axes of rotation of the industrial ... | 11/10/1998 |
| 5664048 | Speed control circuit for a DC motor A speed control circuit for a DC motor includes a digital-to-analog (D/A) converter, a regulator/controller, and a control circuit which applies a compensating current to the DC motor that compensates for variations in loading applied to the motor. The re... | 09/02/1997 |
| 5569988 | Brushless motor drive circuit including a linear amplifier for sending and output signal based upon the detected back electromotive force voltage In a d.c. brushless motor drive circuit, the output amplifier produces a motor winding drive current with dulled rise/fall edges from a detected sinusoidal back e.m.f. voltage induced on the winding during the steady-state operation when the motor runs at... | 10/29/1996 |
| 4864200 | Motor speed control apparatus A speed detector outputs a deviation, from a desired rotation speed, of the rotation speed of a capstan motor for driving a tape. A phase detector outputs a phase deviation, from a reference signal, of a reproduction control signal. When in a recording mo... | 09/05/1989 |
| 4851743 | DC motor speed controller having protection A controller for a battery-driven DC motor controls the average motor current by switching a series-connected FET on and off with a pulse-width-modulated gate signal. Motor speed is changed by changing the duty cycle of the signal, which is generated by a... | 07/25/1989 |
| 4837486 | DC motor speed stabilizing method and apparatus The speed of a DC motor is stabilized to correspond to a reference speed by a motor driving control that is instantaneously responsive to the interval between reference pulses corresponding to the reference speed and actual observed pulses corresponding t... | 06/06/1989 |
| 4831317 | Method for controlling a servomotor In a method of controlling a servomotor, a high output can be fetched from the servomotor by a motor-current control unit of a simple construction, while protecting switching elements of the control unit against excess current. The deviation between a com... | 05/16/1989 |
| 4829218 | Direct current adjusting device A control circuit for adjusting current to a direct current motor that has a free wheeling diode connected in parallel with the armature winding includes a controllable switching element connected in series with the armature winding, a comparator that has... | 05/09/1989 |
| 4804895 | Charge balancing current sampler for a digital motor control An analog current sensing circuit is controlled by a current loop microprocessor. An integrator circuit stores charge which is the integral of armature current in a motor. The output is read by the microprocessor and divided by a time value to determine a... | 02/14/1989 |
| 4780654 | Control apparatus for drilling machine A drilling machine comprises an electric drill having a drill motor for rotating an annular drilling tool and a feed control motor for moving the annular drilling tool forward and backward with respect to a workpiece, both connected to an AC power source,... | 10/25/1988 |
| 4780653 | Anti-stall motor drive An anti-stall motor drive circuit for a very slow running permanent magnet d.c. motor is disclosed. The slow running speed of the motor sometimes allows an insulating film to build up between the brushes and the commutator which causes the stalled conditi... | 10/25/1988 |
| 4752723 | Chopper control system A chopper control system for a vehicle driven by a shunt motor. The system is provided with an integrating circuit for generating a command value for the voltage which is to be supplied to an armature of the motor in accordance with the difference between... | 06/21/1988 |
| 4733149 | Adaptive control system A real time adaptive control capable of maintaining stable operation with changing inertia. The controller utilizes a pseudo-derivative feedback (PDF) type control wherein dynamic adjustment is achieved by adjusting only a single variable. The variable ca... | 03/22/1988 |
| 4728869 | Pulsewidth modulated pressure control system for chemical vapor deposition apparatus A low pressure control system for chemical vapor deposition (CVD) apparatus, including a vacuum pressure chamber and an exhaust pump, is provided by a vacuum pump DC motor which is supplied power from a DC motor speed controller coupled to a DC control in... | 03/01/1988 |
| 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 |
| 4680516 | Motor speed control system A motor speed control system comprises an encoder (12) which produces a series of indicator pulses related to the motor's speed. The period of the pulse is compared with that of a crystal-controlled reference period produced by a period generator (14). Co... | 07/14/1987 |
| 4639652 | Control system for robot manipulator A control system for an multi-articulation robot manipulator in which an electric current used to drive the robot manipulator is detected and compared with a predetermined level band near the saturated current level of the electric current, and a feedback... | 01/27/1987 |
| 4605884 | Control unit A control unit for a movable member comprises a motor for driving the movable member, a speed detector for detecting a rotating speed of the motor, a reference signal generator, amplifiers of different gains for amplifying a signal representing a phase di... | 08/12/1986 |
| 4600867 | Motor speed controlling device A motor speed controlling device comprises a rotating shaft connected to an axle and having rotation speed (set speed) varying with the passage of time, a motor with an output shaft connected to a pointer of a speedometer by means of an eddy-current coupl... | 07/15/1986 |
| 4580084 | Method and system for controlling speed of electric motor A motor speed control method and system allow the motor to be accelerated to the steady state in the minimum time even under conditions of varying load torque, varying load inertia and varying power voltage. The motor is controlled by a voltage including ... | 04/01/1986 |
| 4422023 | Starting circuit for electronically controlled motor apparatus A starting circuit for an electronically controlled actuator having an integration capacitor provided in a control signal path and a power supply circuit for supplying a power supply voltage to the motor apparatus, comprises a comparator having first and ... | 12/20/1983 |
| 4383167 | Drive control circuit for dental treatment instruments A circuit arrangement is provided for controlling the drive of dental treatment instruments by means of driving devices associated therewith and the operating data of which are adapted to be fed to a separate forward/backward counter when the particular t... | 05/10/1983 |
| 4355268 | Motor control apparatus Disclosed is a motor control apparatus which includes a pulse generator for producing a first signal as a pulse signal having a period corresponding to the rotational speed of a motor, a timer for producing a second signal inverted to a first level in res... | 10/19/1982 |
| 4348585 | Frequency/speed controller A frequency/speed controller is provided for controlling the frequency or speed of a device by comparing the frequency of the device to a known reference frequency and matching the device frequency with the reference frequency. The controller uses an up/d... | 09/07/1982 |
| 4297623 | System for controlling a separately excited constant load DC electric motor A separately excited constant load DC electric motor is controlled in resse to a source of current for the desired motor speed. Current from the source applied to the motor armature is modified by a motor loss simulator circuit responsive to the source. ... | 10/27/1981 |
| 4287458 | Digital servo control circuit In a digital servo control system, the duty cycle of a pulse width modulated signal for controlling a drive motor is determined by digital numbers representing phase and/or speed errors preset into a memory and circulating counter. The circulating counter... | 09/01/1981 |
| 4283671 | Automatic residual phase error compensation circuit for a digital servo control system A digital servo control system for controlling a drive motor accumulates speed and phase error numbers and produces a pulse width modulated signal in response thereto. Phase errors are measured by counting pulses of a clock signal between the arrival of a... | 08/11/1981 |
| 4244513 | Centrifuge unit Disclosed is an improved centrifuge apparatus for separating substances of varying density and a method of controlling the speed of a rotor of the centrifuge apparatus. A vent-view port is mounted for in-out adjustment within an access aperture formed in ... | 01/13/1981 |
| 4242619 | Digital servo control circuit The duty cycle of a pulse width modulated signal for controlling a drive motor is determined by the content or numbers stored in a counter and representing phase and/or speed errors. The counter is driven by a clock signal which has a number of cycles dur... | 12/30/1980 |
| 4211961 | Control circuit for use in control of current supply for electric motor with improved duty controlling oscillator circuit, particularly for electrical vehicle A control circuit for controlling supply of current for electric motor has a chopper circuit connected with a battery in series. The chopper circuit is constructed with such as power transistors or power thyristors, and the ON-OFF operation thereof is con... | 07/08/1980 |
| 4203061 | Rotational speed indicating apparatus In a motor-driving system, the motor speed is controlled by a feedback signal derived from the difference in frequency and phase between a manually adjustable variable frequency and a rotational speed indicating signal. Frequency deviation of the manually... | 05/13/1980 |
| 4168457 | Self adaptive speed control system Apparatus for controlling the velocity of a moveable load, such as the magnetic head assembly of a disk drive, comprising means for providing velocity command and velocity feedback signals which are combined to produce a velocity control signal for moving... | 09/18/1979 |
| 4100528 | Measuring-while-drilling method and system having a digital motor control A measuring-while-drilling system has a digitally implemented motor speed control circuit for controlling a downhole, motor-driven acoustic signal generator. The acoustic generator is motor driven at speeds for imparting to well fluid an acoustic signal h... | 07/11/1978 |
| 4097787 | Device for controlling the peripheral speed in rotating objects In order to control the peripheral speed of a rotating object, such as a grinding wheel, the current of the motor driving the grinding wheel is periodically integrated during a deceleration and an acceleration to obtain a composite signal from the integra... | 06/27/1978 |
| 4084119 | Chopper control system A chopper control system for controlling the amount of power supplied from a DC power source to a load having inductance. The chopper control system comprises a chopper circuit for accomplishing the on-off control of main current flowing from a DC power s... | 04/11/1978 |
| 4080555 | Drive control circuit for d.c. motor The rotation of a motor is controlled to maintain a standard frequency from a standard frequency generator in synchronism with the frequency of a tachogenerator which is associated with the d.c. motor. In order to prevent the motor rotation from being sta... | 03/21/1978 |
| 3983316 | Turntable speed control system In a video disc system for recovering prerecorded signals from a disc record by a signal pickup including a turntable, turntable drive means, and turntable speed adjusting means, a turntable speed control system is provided for maintaining the rotation of... | 09/28/1976 |
