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| Number | Title | Issue Date |
| 7417386 | Electronic line shaft A method and assembly for synchronizing machine operations, the assembly comprising a reference generator for generating a speed reference signal and a position reference signal, a plurality of slave units, each slave unit including, a mechanical device, a separate ... | 08/26/2008 |
| 7154244 | Steering apparatus Steering apparatus includes at least one motor for generating a steering assisting force in a direction to steer a steerable wheel, two drive circuits having respective switching elements for PWM-controlling the motor, and a controller for differentiating, between t... | 12/26/2006 |
| 7038405 | Control of parallel operation of frequency converters or inverters A method and a system for controlling parallel-connected frequency converters or inverter units feeding an alternating-current motor (MOTOR1) provided with parallel windings or separate parallel motors having their shafts mechanically coupled together via a l... | 05/02/2006 |
| 7019483 | Devices for position-controlled stopping of rotating components with position-controlled drive mechanisms in the case of voltage loss The position-controlled stopping of rotating components of shaftless drive mechanisms, in the case of a loss of voltage, is accomplished by the provision of an external connectable network. That external connectable network supplies the process power which is missin... | 03/28/2006 |
| 6950029 | Airflow blockage detection apparatus for a permanent split-capacitor single-phase fan motor An airflow blockage detection apparatus for a permanent split-capacitor single-phase cooling fan motor measures and compares electrical currents in main and auxiliary windings of the motor to detect airflow blockage. Main and auxiliary current sensors detect AC curr... | 09/27/2005 |
| 6933687 | Dual motor configuration with primary brushless motor and secondary integrated speed control motor A dual motor configuration 10 is provided for driving two fans for moving air to cool an engine. The dual motor configuration includes a primary brushless motor 18 constructed and arranged to be electronically controlled to drive a first fan 16 ... | 08/23/2005 |
| 6911752 | Concatenated motor assembly A concatenated motor assembly for providing rotational power that includes a continuous rotatable shaft cooperating with a first motor module assembly. The first motor module assembly communicates with a motor coupling unit, which in turn communicates with a second ... | 06/28/2005 |
| 5914581 | Information recording device In order to raise the drive efficiency of a spindle motor that drives a recording disk for information recording and hence to achieve power saving/lowering of noise level of the information recording device as a whole, in an information recording device w... | 06/22/1999 |
| 4987351 | Load-based control of an AC motor An AC motor control based on an iterative computation of the motor load and method of accurately determining motor load. At the initiation of motor operation, the load term (%LOAD) is initialized to zero, and the motor is energized in accordance with a pr... | 01/22/1991 |
| 4891566 | Method for speed regulation and switch arrangement for performing the method To regulate the speed of a plurality of asynchronous motors fed by a converter having a variable output frequency and output voltage and having a load-dependent slip, particularly asynchronous motors for driving spindles of a textile machine, the rotation... | 01/02/1990 |
| 4825131 | Control system for induction motor driven electric car A DC voltage on an electric car stringing is supplied to a variable voltage and variable frequency PWM inverter so as to be converted into a three-phase alternating current which is supplied to a plurality of three-phase induction motors. The motors are c... | 04/25/1989 |
| 4799126 | Overload protection for D.C. circuits Protection for D.C. electrical circuit branches against incipient overloads comprises the use of semiconductor devices known as intelligent switches. An intelligent switch comprises a main controlled conduction path whose conductivity is controlled by an ... | 01/17/1989 |
| 4760314 | Rotation controller for a differential actuator A rotation control apparatus for a differential actuator includes two induction motors and a differential mechanism for producing a constant torque on its output shaft based on the differential speed of the induction motors. The appartus includes two inve... | 07/26/1988 |
| 4625156 | Control device A device for controlling plural loads with phase locked loop control method by means of reference signals of different phases in order to avoid peak in electric power consumption.... | 11/25/1986 |
| 4617497 | Spinning or twisting machine control system An emergency battery power supply for a ring-spinning or ring-twisting frame can be brought into operation by an automatic circuit to bridge brief power failures and effect programmed shutdown of the motors upon longer power failures, with the speed ratio... | 10/14/1986 |
| 4447788 | Method for optimizing the power input of a plurality of hysteresis motors connected in parallel A method for optimizing the power input to a plurality of parallel connected hysteresis motors wherein a three phase alternating voltage source jointly supplies the motors with an adjustable operating voltage. The method includes measuring, during the ope... | 05/08/1984 |
| 4438376 | Variable slip controller for an AC motor A control system is provided in which a signal proportional to the actual rotor speed of an induction motor is coupled to a variable gain amplifier. Changes in the commanded gain of the amplifier electronically control the ratio between rotor speed and th... | 03/20/1984 |
| 4405884 | Shaft position synchronization means for multiple synchronous induction motors The exact shaft angle position synchronization of two or more ordinary synchronous induction motors is provided. One motor, serving as the master, is powered directly from a source of alternating current. Each additional motor, which may be of a different... | 09/20/1983 |
| 4326152 | System for controlling the in-phase operation of a pair of motors The operation of a first motor and a second motor generates first and second frequency signals, respectively, which are fed to a phase lock loop (59) for phase comparison. A tri-level detection circuit (61) develops an output signal in response to the pha... | 04/20/1982 |
| 4310787 | Phase-control device for synchronous motors A device for controlling the phase of an output pulse sequence relative to an input pulse train of the same frequency comprises a multiplier receiving the pulse train from a frequency generator and emitting to a divider a rectangular waveform having a fre... | 01/12/1982 |
| 4275394 | Radio control driving circuit device A radio control driving circuit device used for a model device having a radio control system comprising a d-c power supply, two electric motors and a receiver, characterized in that two transistors of the same type, instead of the conventional complementa... | 06/23/1981 |
| 4271379 | Web fed printing press motor control A web fed press has at least one press unit including a first web driving means driven by a first motor. Downstream from the press unit is a second web driving means, such as nip rolls, driven by a second motor. Encoders are associated with the motors to ... | 06/02/1981 |
| 4253050 | Method and apparatus for the synchronization of a gear machining apparatus This invention concerns a method for the synchronization of a gear machining instrument that works according to the hobbing method. It has different drives for the tool and the work-piece. In the process, a series of pulses are produced, dependent upon th... | 02/24/1981 |
| 4227126 | Shaft rotation interlock system for film editing tables and the like There is disclosed apparatus suitable for use in conjunction with film editing tables or other devices requiring precise control over shaft rotation speed, that is, apparatus for interlocking two or more shaft rotating systems to rotate one or more slave ... | 10/07/1980 |
| 4196376 | Rotary speed ratio control arrangement The invention relates to a control circuit for controlling the speed ratio of a lead motor and a follower motor. The outputs of pulse generators driven by the motors are compared by being fed the positive and negative inputs of a bidirectional counter whi... | 04/01/1980 |
| 4130838 | Speed control apparatus for scanning system Apparatus for controlling the rotational speed of a polygonal mirror adapted to scan a reflected light beam over a desired scanning area as each facet of the mirror is rotated into the path of an incident light beam. The apparatus comprises a poly-phase m... | 12/19/1978 |
| 4110668 | Thyristor pulse controller for plural loads A pulse controller for controlling the current supply to a plurality of d.c. loads through a respective main thyristor for each load is provided with digital circuitry operable to maintain the mark-space ratios of voltage applied to the loads in a relatio... | 08/29/1978 |
| 4095146 | Reel-to-reel drive with speed control Long and short term variations in the speed at which a magnetic tape is moved with respect to a read and/or write head are minimized by maintaining the product of the speed of the tape payout and take-up reels constant. In accordance with a preferred embo... | 06/13/1978 |
| 4052646 | Speed control system for a corrugator The separate motors of the single facer and double facer machines of a corrugator are controlled in response to separate digital set point signals. Each set point signal is generated by a counter in response to a pulse generator. In a RUN mode, the counte... | 10/04/1977 |
| 3973177 | Motor speed control device A system for controlling the speed of a direct current motor. The system employs a pair of breaker points for opening and closing the circuit containing the motor. By varying the frequency of contact between the breaker points and the period of time the p... | 08/03/1976 |
