Abstract: A sensor includes a main drive gear mounted on a shaft that is subjected to detection by the sensor such that the main drive gear is rotatable integrally with the shaft; at least one driven gear meshing with the main drive gear; a sensor housing accommodating the main drive gear and the at least one driven gear; a biasing member biasing the at least one driven gear toward the main drive gear; and a conversion mechanism configured to convert an axial force that is parallel to an axial direction of the shaft and acts on the at least one driven gear to a force in such a direction that the at least one driven gear is separated from the main drive gear when a part of the at least one driven gear contacts a part of the main drive gear while the shaft is inserted in the sensor housing.

Abstract: A phase adjusting device includes: a torque acquisition unit acquiring a torque; a position acquisition unit acquiring the rotational position of the first motor; a first motor control unit rotating the first motor in a first rotational direction until the torque exceeds a threshold, and then in a second rotational direction until the torque exceeds the threshold again; a storage control unit storing, in a storage unit, a first rotational position when the first motor is rotated in the first rotational direction and the torque exceeds the threshold and a second rotational position when the first motor is rotated in the second rotational direction and the torque exceeds the threshold again; a phase position calculator calculating a third rotational position, based on the first and second rotational positions; and a second motor control unit rotating the first motor to the third rotational position.

Abstract: A flow generator includes pumps operated by motors to generate an amount of a hydraulic fluid, a proportional hydraulic control valve to control output hydraulic pressure according to the amount of the hydraulic fluid, a pressure sensor to detect the output hydraulic pressure, and a hydraulic servo loop controller to which a required hydraulic pressure and a required amount of fluid are input by a user. Based on a feedback signal representing the output hydraulic pressure, the controller generates a pressure control signal for controlling the proportional hydraulic control valve based on the required hydraulic pressure and a change in the output hydraulic pressure. It also generates an RPM input signal for controlling a motor's RPM.

Abstract: A preload torque value generating unit (22m) generates a preload torque value (Tpm) as a function of the acceleration (am) of a main motor (6m), the preload torque value (Tpm) being a torque value that is appended in advance to a torque command value (Tm) so that the direction of force applied to the main motor (6m) and the direction of force applied to a sub motor (6s) will become opposite to each other. A preload torque value generating unit (22s) generates a preload torque value (Tps) as a function of the acceleration (as) of the sub motor (6s), the preload torque value (Tps) being a torque value that is appended in advance to a torque command value (Ts) so that the direction of force applied to the main motor (6m) and the direction of force applied to the sub motor (6s) will become opposite to each other.

Abstract: Particular embodiment of the invention relates to motors that produce reaction force cancellation and are thus well suited to applications where accelerations and reaction forces are relatively large. Such motors are particularly well suited to precision machinery that can benefit from fast accelerations with short settling times. In particular, the motors include movable and counter-movable motor members, where the counter-movable motor member has a reaction mass to counter the reaction force of the first movable motor member.

Abstract: In a sheet-fed printing press including; an impression cylinder gear driven by an upstream drive motor of an upstream printing unit group; an impression cylinder rotationally driven by the impression cylinder gear; a transfer cylinder gear of a convertible press mechanism rotationally driven by the upstream drive motor through the impression cylinder; and a transfer cylinder which is provided with a notch and is rotationally driven by the transfer cylinder gear, a load motor is provided to the transfer cylinder or the transfer cylinder gear, and braking force of the load motor is controlled according to load on the upstream drive motor.

Abstract: A torque detection device includes: a torsion bar that couples a first shaft to a second shaft; a magnet that is fixed to the first shaft; and a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face each other in an axial direction. Each of the magnetic yokes includes a yoke ring and a plurality of lugs that are arranged in a circumferential direction on the corresponding yoke ring. Each yoke ring includes an extending portion that extends radially outward from base portions of the lugs, and a bent portion that is bent in the axial direction from a radially outer end portion of the extending portion. The outer size of the pair of magnetic yokes in the axial direction is larger than or equal to the length of the magnet in the axial direction.

Abstract: A field-oriented control method for an electric drive comprising a plurality of electric motors, for implementing a tension mechanism, especially for load cable and/or gearing means, using measurements of a polyphase motor actual current. The measured values are transformed into a direct current component and a quadrature current component, based upon a magnetic rotor field or flux angle, in a rotor flux-based d,q coordinate system. The quadrature and direct current components from the actual current are subjected to a comparison with predetermined quadrature and direct current components of a current command value.

Abstract: A power transmission device capable of adjusting a torque to be applied to an output shaft easily and removing a backlash between gears exactly, and a display device and a display panel pedestal that have the power transmission device. A power transmission device 101 includes a display panel 102, an output shaft 103 to which the display panel is connected, output gears 104 and 105 rotating integrally with the output shaft, transmission gears 106 and 107 engaged with the respective output gears, motors 108 and 109 providing driving forces to the respective transmission gears, and a control circuit 110 controlling the motors. The control circuit 110 causes the motors 108 and 109 to rotate the transmission gears 106 and 107 at different rotation numbers, and to transmit different driving forces to the respective output gears 104 and 105.

Abstract: A power transmission device capable of adjusting a torque to be applied to an output shaft easily and removing a backlash between gears exactly, and a display device and a display panel pedestal that have the power transmission device. A power transmission device 101 includes a display panel 102, an output shaft 103 to which the display panel is connected, output gears 104 and 105 rotating integrally with the output shaft, transmission gears 106 and 107 engaged with the respective output gears, motors 108 and 109 providing driving forces to the respective transmission gears, and a control circuit 110 controlling the motors. The control circuit 110 causes the motors 108 and 109 to rotate the transmission gears 106 and 107 at different rotation numbers, and to transmit different driving forces to the respective output gears 104 and 105.

Abstract: A field-oriented control method for an electric drive comprising a plurality of electric motors, for implementing a tension mechanism, especially for load cable and/or gearing means, using measurements of a polyphase motor actual current. The measured values are transformed into a direct current component and a quadrature current component, based upon a magnetic rotor field or flux angle, in a rotor flux-based d,q coordinate system. The quadrature and direct current components from the actual current are subjected to a comparison with predetermined quadrature and direct current components of a current command value.

Abstract: A motor adapter includes a frame having a first end adapted for mounting to a motor and a second end adapted for mounting to a rotatably driven machine. The frame includes an adjustable reaction point.

Abstract: An articulating probe head includes motors 12 and 18 for driving respective output shafts 14 and 20 about respective orthogonal axes z and x to move a stylus 22 over the surface of a workpiece under the control of a controller 26. At least one of the motors is inertia balanced by mounting the stator 32 of the motor on bearings 42 to allow it to rotate in opposition to the rotation of the rotor 34. Control of the speed of the spinning stator is achieved by connecting it to the winding assembly 46 of an additional “back-to-earth” motor 47 the magnet assembly 48 of which is connected to the housing. The motor 47 acts as a brake to prevent overspeeding of the rotatable stator, and can have power supplied to it to ensure that the stator does not slow down excessively when the main motor is running at constant angular velocity. Control of the power supply to the motors is achieved by the controller 26.

Abstract: Two motors are used to provide motion control in a transport drive system. A primary motor, or a primary and secondary motor, provides primary power for accelerated motion. PWM signals are used to drive the motors according to predetermined fixed functions related to acceleration, deceleration and hold of a load. Alternatively, during onset of large or high speed moves, the primary and secondary motors are on in tandem. During deceleration of a move, the torque provided by the secondary motor is reversed, providing active braking and ensuring the drive train remains loaded wherein backlash is eliminated. During a driver hold phase, the primary and secondary motor push against each other to actively control positioning.

Abstract: Apparatus embodying the invention includes first and second motors coupled to a carriage assembly for moving the carriage assembly back and forth between first and second end points. The first motor is for developing a force to drive the carriage in one direction and the second motor is for developing a force to drive the carriage in an opposite, second direction. When the first motor causes the movement of the carriage in one direction, the slowing, stopping and reversal of the carriage is achieved by varying the power supplied to the second motor relative to the power supplied to the first motor until the force exerted by the second motor first equals and then exceeds the force exerted by the second motor. So operated, the carriage motion is well controlled and exhibits little, if any, backlash.

Abstract: A power output apparatus (20) of the present invention includes a clutch motor (30), an assist motor (40), and a controller (80) for controlling the clutch motor (30) and the assist motor (40). The clutch motor (30) includes an outer rotor (32) linked with a crankshaft (56) of a gasoline engine (50) and an inner rotor (34) connecting with a drive shaft (22). The assist motor (40) includes a rotor (42) connecting with the drive shaft (22). An electric current flowing through three-phase coils (36) in the clutch motor (30) enables the outer rotor (32) to be coupled with the inner rotor (34) with a certain slip. Electrical energy corresponding to the certain slip is recovered as an electric power via a first driving circuit (91). The assist motor (40) is controlled with the electric power via a second driving circuit (92) so as to apply a torque to the drive shaft (22).

Abstract: An anti-backlash gearing system which includes first and second drive gears hich mesh with a driven gear to provide torque and rotational motion to the driven gear. The drive gears are each driven by a motor, while the driven gear drives a load. The anti-backlash gearing system uses a microprocessor to control the command voltage R to each of the drive motors. The command voltage R provided to each drive motor also includes an offset .delta. which may be positive for one motor and negative for the other motor. The torque provided by one motor and its associated drive gear to the driven gear may be in the positive direction (clockwise direction), while the torque provided by the other motor and its associated drive gear to the driven gear is in the negative direction (counterclockwise direction). The motors are driven in opposite directions to control the backlash on the gears.

Abstract: A threaded ball screw is stationarily non-rotatably mounted in a machine tool to extend parallel to the line of action traversed by a carriage. A pair of threaded ball nuts are laterally restrained in and mounted for free rotation thereof in a drive mechanism of the carriage and threadably and concentrically engage the ball screw in laterally spaced apart co-axial relationship therealong. A pair of digitally controlled electric drive motors are mounted in the carriage for individually imparting rotational torque to the nuts. A conventional programmably CNC controller is programmed to synchronously control both motors for causing the ball nuts to conjointly produce computer controlled linear motion and positioning of the carriage along the stationary ball screw, and to develop anti-backlash pre-load forces between the ball nuts relative to the ball screw.

Abstract: A system having two or more A.C. motors driving the same load. The stator windings and rotors of both motors each conduct current having a vector representative of a magnitude and angular position of the current in the respective rotor and stator winding. Stator current sensors are provided for producing an indication of the magnitude of the stator current vector to each motor. Encoders are provided for sensing the rotating speed of each of the rotors from which can be calculated the angular position of the rotor load current vector with respect to the rotating stator flux current vector. A first torque control controls the magnitude of the stator current of a first one of the motors such that the stator flux current vector of the first motor and the rotor load current vector of the first motor are angularly separated by 90.degree.. This angular relationship produces maximum torque at the rotating speed of the first motor.

Abstract: A dual drive motive system used to control the movement or position of another system or structure in a first and second embodiment has two motors, two frame members and a ring moveably mounted between the frame members by means of suitable bearings. One of the motors provides continuous relative motion between the ring and one of the frame members which may be secured to a foundational structure. The other motor provides relative motion between the ring and the other frame member which may be secured to a turret structure. This motion avoids the transient disturbances of lubricants. In a third embodiment, the system includes two armatures which share a common stator. In operation, the armatures and stator which are concentrically positioned rotate relative to each other and in opposite directions. In a fourth embodiment, the armatures share a common stator and the armatures are coaxially positioned.

Abstract: The present invention relates to a motor driving device wherein two motors are held in engagement with an identical spindle through respective torque transmission mechanisms, and wherein each of the motors has a driving amplifier for generating a torque in a direction reverse to that of a torque of the other motor; comprising an integration circuit which integrates with respect to time a difference signal between an angle command value of the spindle and a rotational angle feedback value thereof, and which applies its integral output to the driving amplifiers in common.

Abstract: Reaction force compensation means 70 (FIG. 1) for countering the reaction torque of a heavy body, such as rotatable yoke assembly 20, when accelerated relative to flimsily supported body 21 about axis 22, comprises a reaction member 71 rotatable about the, or a parallel, axis 22 and a reaction drive motor 74 coupled to rotate the reaction member by way of velocity step-down gearing 75. In response to acceleration of the body 21 the reaction drive motor 74 accelerates member 71 in the opposite direction producing an equal and opposite reaction torque on the structure. The reaction member is made with a higher moment of inertia about axis 22 than the body and is accelerated at a correspondingly lower rate to give the balancing reaction torque while requiring a smaller mechanical power input than might be expected. The power required of the drive motor is minimized by optimizing the gearing ratio having regard to the moments of inertia of the reaction member and drive motor.

Abstract: A motion control drive system for producing and controlling programmed and remote controlled machine operations by directing and controlling the performance of a rotating output shaft. The output shaft is then used to provide drive power and programmed control of various machine operations required to be controlled by a program of predetermined machine operating commands. The final program of operating commands being stored on audio magnetic sound recording tape or other audio recording media for purposes of storage and subsequent use in directing and controlling a given machine. The program of operating commands being stored on two track audio magnetic tape in the form of dual, first and second, time varying and or fixed frequency audio signals whose frequencies interact and become the function of the commands to be executed.

Abstract: A load positioning system with gravity compensation has a servo-motor (12), position sensing feedback potentiometer (38) and velocity sensing tachometer (42) in a conventional closed-loop servo arrangement to cause lead screw (14) and ball nut (20) to vertically position load (22). Gravity compensating components comprise the DC motor (32), gears (34) and (36), which couple torque from motor (32) to the lead screw (14), and constant-current power supply (37). The constant weight of the load (22) applied to the lead screw (14) via the ball nut (20) tends to cause the lead screw (14) to rotate, the constant torque of which is opposed by the constant torque produced by motor (32) when fed from the constant-current source (37). The constant current is preset as required by potentiometer (54) to effect equilibration of the load (22) which thereby enables the positioning servo-motor (12) to "see" the load (22) as weightless under both static and dynamic conditions.

Abstract: An electric motor having a cage pivotally mounted at one end to a post interior a housing by a first bearing and at its other end by a second bearing between the exterior of the cage and the interior of the housing. A first stator is mounted to the interior of the cage and has an output shaft and first rotor interior thereto. A second rotor is mounted to the exterior of the cage and interior a second stator which is mounted interior the housing. The second stator is driven with a control signal which is a function of the measure reaction torque experienced by the first stator to produce a counter torque to balance the reaction torque. A consistency transmitter mounted on the output shaft produces torque on the first stator as a function of the consistency of the material in which it is rotated.

Abstract: An electric motor having a first rotor on an output shaft, a first stator pivotally mounted to a housing, a second rotor mounted to the first stator and a second stator mounted to the housing. The second stator is driven with a control signal which is a function of the measure reaction torque experienced by the first stator to produce a counter torque to balance the reaction torque. A consistency transmitter mounted on the output shaft produces torque on the first stator as a function of the consistency of the material in which it is rotated.

Abstract: An apparatus is provided for use with a motor drive for cancelling the electromagnetic reaction energies developed by a pair of drive motors upon rapid starting or sudden stopping, the latter occurring upon the application of dynamic braking to said motor drive. The apparatus comprises a pair of motors each provided with rotors preferably having moments of inertia which are substantially equal. The output shafts of the motors are operatively connected so as to rotate in opposing directions.

Abstract: An improved chromatographic pump control circuit for compensating for pulsation in pump flow over a wide range of flow-rates and pressures and for providing improved protection against pump pressure and motor torque fault conditions. The control circuit is coupled to a pump motor to provide motor speed-up during the repressurization portion of the pump cycle as a function of the set point pump flow rate. The circuit also includes a summing circuit for developing a repressurization signal based on the flow-rate and detected pressure. The signal is coupled to compensate for pulsation by controlling the duration of repressurization with respect to both pressure and the set point of the flow rate. The circuit is additionally coupled to sense pump pressure and motor torque to initiate alarm and pump shutdown during high and low pressure and motor over-torque fault conditions.

Abstract: An apparatus is provided for use with a motor drive for cancelling a reaction energy of a drive motor upon rapid starting or sudden stop. The apparatus comprises a revolving member adapted to be operatively connected with the rotor of the drive motor. The member has an inertia which is equal to that of the rotor, and is adapted to be connected with the latter in the opposite sense therefrom.

Abstract: A hybrid stepping motor unit includes a stepper-type primary motor and a secondary motor. The rotor shafts of the stepper-type primary motor and the secondary motor are connected to a common output shaft. The stepper-type primary motor is energized in response to an electrical command signal from an external source, such as a computer. When the stepper-type primary motor is energized, the stepper-type primary motor produces torque and attempts to drive the load combination of the interconnected rotor shafts, the common output shaft, and any mechanical load on the common output shaft, such as a machine tool component. This produces a reaction torque on the stepper-type primary motor. A transducer converts the reaction torque into an electrical control signal. The secondary motor is energized in response to the electrical control signal from the transducer.

Abstract: There is disclosed an electric system for controlling the direction of rotation of two counter rotating motors operated from a source of A.C. line voltage, the system comprising a selecting circuit operated by a rectifier connected to the source and containing two junctions, a first of which is at a D.C. voltage V when the second is at zero voltage and vice versa. A reset switch operated mechanically by rotation of the motors puts the voltage V alternately at the first junction and the second junction. When the voltage V is at the first junction it produces a pulse in a first control path which controls the first of the motors and when it is on the second junction it puts a pulse on the second path for operating the second motor. Each control path comprises a latch circuit operated by the pulse, a time delay circuit and a motor control circuit including a power switch operable at the end of the time period to torque the respective motor.