Abstract: A spindle orientation control apparatus according to the invention provides a spindle (4) for which a magnetic sensor senses the spindle and outputs stopping-position proximity (LS) signal and a stopping position determination (MS). The spindle (4) is coupled via gear or belt (5) to a spindle motor (2) wherein the spindle is controlled to stop at a fixed position based on a velocity command conforming to velocity of the spindle motor (4). Velocity pulses for detecting the rotational velocity of the motor can be employed as position pulses. A velocity command value (VCMD) can be reduced by an amount corresponding to a number of fed back velocity pulses a. The velocity value is clamped at a predetermined level when the velocity command value of the spindle attains a predetermined level until a final changeover. The final the spindle changeover for making equal stop-position decision signal (MS) signal and the velocity command value when an edge of the stop-position proximity signal (LS) signal is detected.

Abstract: A method for improving the efficiency of a stepping motor (1) comprising a rotor (15) having a permanent magnet (16) producing a first magnetic field, as well as a first coil (13) and a second coil (14) for supplying to the magnet (16) respectively a second magnetic field (18) and a third magnetic field (19) symmetrical to one another in relation to an axis of symmetry (7) intersecting the axis of rotation (15a) of the rotor (15).

Abstract: The present invention provides a recording apparatus wherein recording is performed by reciprocably shifting a carriage on which a recording head is mounted by means of a stepping motor and which comprises a rotational position detection device for detecting a rotational position of a rotor of the stepping motor, and a control unit for performing a closed loop control for the change-over timing of excitation currents to coils of the stepping motor and for the driving speed of the stepping motor, on the basis of the detection signal from the rotational position detection device, and judges whether the initial drive of the stepping motor and the change-over timing are normal, through the control unit.

Abstract: The linear drive motor is based around a proportional solenoid L1, to which is connected a velocity transducer F1. The velocity output of the transducer F1 is compared to a reference voltage V1 by an error amplifier/driver A1, which in turn drives the solenoid L1. This gives velocity control to the linear motor, without the usual disadvantageous rotary to linear conversion mechanisms. The linear motor therefore has a higher bandwidth, and is free from mechanical vibrations and resonances, and from backlash.

Abstract: A servo control apparatus comprising: a unit for generating a required position value; an actuator adapted to drive a load and having its maximum displacement in one direction and its minimum displacement in the other direction; a drive unit for driving the actuator; a position detecting unit for detecting a displacement of the actuator; and a control unit for correcting the required position value on basis of the maximum and minimum displacements of the actuator and for computing a deviation between an output of the position detecting unit and the corrected required position value; the load being controlled by the deviation.

Abstract: Disclosed is a synchronous control system for effecting a synchronous and superimposed operation among different channels of a multi-channel-control machine tool. A follow-up error amount (.epsilon.3) of a servomotor responsive to a superimposing instruction is simulated, a difference is determined by subtracting the follow-up error amount (.epsilon.3) to the superimposing instruction from a follow-up error amount (.epsilon.2) of a servomotor for a superimposed operation axis (Z2) and the difference is compared with a follow-up error amount (.epsilon.1) of a servomotor for a synchronous operation axis (Z1) to produce an alarm when the comparison indicates the operation of the servomotors is synchronized and superimposed.With this arrangement, a synchronous error can be checked when a superimposed operation of the servomotors is effected.

Abstract: This electrical resolver has an arcuate stator with a concave inner side concentric to a convex side of an angularly rotatable arcuate rotor limited to rotation within outer ends of the stator. The stator and rotor have arcuate magnetic cores with transverse slots in which are embedded windings made of insulated wire. Rotation of the rotor causes changes in voltages induced in the stator windings corresponding to the extent of angular position of the rotor. The stator windings include trimming coils which generate bucking voltages to reduce errors in determining angular position of the rotor. In an operating range of .+-.10.degree. from a centered position, magnitudes of rotor position can be determined with an accuracy of 5-10 arc seconds maximum, with a considerable savings in space, weight, cost, simplified installation, and increased stability over the operating temperature range.

Abstract: An automatic guided vehicle comprising a loading table provided with positioning motors for three directions including two on a horizontal plane and a rotational one around a vertical axis and also with optical sensors for detecting positioning marks at stop positions so that positioning of the automatic guided vehicle at a stop point thereof may be ensured in high precision, and a method for positioning the automatic guided vehicle without attendant with high precision in such manner that the optical sensors detect degrees of deviation between the guided vehicle and the positioning marks, and positioning motors are driven after computing three-directional positioning correction values based on the result of detection or reducing deviation at the loading table.

Abstract: An electrohydraulic servo system in which a microprocessor-based controller directs a pulse width modulated control signal to a servo valve for controlling flow of hydraulic fluid therethrough. Duration of each half-cycle in the pulse width modulated control signal is separately controlled by selectively incrementing or decrementing duration of the half-cycle in increments of the microprocessor clock period. Signal transition is controlled by a timer interrupt in which time required to enter the interrupt routine is measured following generation of the interrupt, and further operation is delayed by a complementary time, so that control signal transition takes place a fixed preselected number of clock periods after generation of a timer interrupt. In this way, timer interrupt latency is eliminated, and resolution of the pulse width modulated signal is enhanced through individual duration control of the signal half-cycles while maintaining a fixed modulated signal period.

Abstract: A motor control device for a powered seat comprising a switch capable of selective determination for rotation direction of a motor and further of depression for adjustment of rotation rate of the motor, and an electric circuit for causing the motor to rotate in a selected one of normal and reverse directions and increase or decrease its rotation rate in response to the switch-over and depressing/releasing operations of such one switch only.

Abstract: For controlling the rotation angle of a main shaft of a numerical control machine tool in synchronization with the position of a feed shaft, the learning control method according to the present invention comprises steps of reading the positional command value of the feed shaft corresponding to the detected value of the current revolutional angle of said main shaft out of the table which stores in advance the positional instruction values corresponding to the angle equivalent to one rotation of the shaft, subtracting the detected value of the current position of the feed shaft from the read out positional value to obtain the positional deviation table of the shaft, renewing the correction value table of the positional deviation values of the shaft which are stored in advance by using afore-mentioned deviation table, and suspending the renewal operation of the correction table of the positional deviation when the difference between the positional deviation table which has been added with the correction value ta

Abstract: A computer controlled electric motor with a driving shaft having a resilient cup type safe knob gripper fixedly attached to the distal end thereof for rotation therewith. A key pad for programing the computer memory with a plurality of different rotational sequences. Each sequence is associated with a combination of a different combination lock. Any of the lock opening rotational sequences stored in the computer memory can be addressed by the key pad. A storage battery provides operating and stand by power for the computer, memory and motor.

Abstract: A mobile member control apparatus is provided having a motor for moving a mobile member from a first position to a third position through a second position.

Abstract: A unipolar motor control system includes motor current regulation derived from monitoring battery voltage and motor temperature. The monitored battery voltage and motor temperature are inputs to a microprocessor control which has one or more look-up tables for developing an appropriate scaling factor that adjusts the voltage across the motor coils so that proper current magnitude is delivered to the motor.

Abstract: A servo-control apparatus generates a velocity command by applying backlash correction data to position error data when direction of rotation of a servomotor is reversed, and performs a backlash correction by adding an amount of backlash acceleration to the velocity command. In order to terminate backlash acceleration at an appropriate time, velocity feedback pulses are accumulated by a counter from the moment acceleration control starts, and the accumulated value of velocity feedback is monitored by an acceleration-stop instructing unit. When the accumulated value attains a predetermined value, an acceleration output unit is caused to halt the output of the amount of backlash acceleration to complete control of backlash acceleration.

Abstract: The apparatus controls the positioning of a device in response to a commanded input signal, and comprises an element for moving the device in response to an error signal. A sensor component determines the actual position of the device, the sensor component outputting a primary signal and a derivative signal corresponding to the actual position and velocity of the device, respectively. A complementary filter system filters the primary signal and the derivative signal to generate a derived position signal, the derived position signal being combined with the commanded input signal thereby generating the error signal. The filtering results in effectively increasing the resolution of the sensor component thereby reducing the limit cycle caused by quantization of the sensor component.

Abstract: A method of controlling a switched reluctance motor during high speed operation in an operational range when the counter electromotive force exceeds the available DC source voltage and, therefore, the maximum desired converter current cannot be obtained, establishes torque control in a feedforward manner by controlling current pulse position.

Abstract: A motor drive system used with industrial robots, processing machines, and the like comprising an external interface part ready for connecting a plurality of kinds of host controllers generating a command signal; a sensor interface part to which a motor rotation detecting sensor is connected; a main control part operating for feedback control of a motor according to signals provided by way of the interfaces; and a power amplification part for feeding a current to motor coils according to a control signal from the main control part and wherein the external interface part, the sensor interface part, the main control part, and the power amplification part are separate and modularized as cards. Advantageously, the various controllers, sensors and power systems are changeable to flexibly meet different user requirements.

Abstract: A method for operating a multi-phase switched reluctance motor is a generator mode includes gating switches connected in series with selected ones of the phase windings of the motor into conduction to establish current flow in a selected one of the windings. The switches are thereafter disabled and current is forced to commutate into flyback diodes whereby the current is returned to an associated DC bus. The instant at which the conducting switches are gated out of conduction is selected or measured in angular displacement between an associated stator pole and a corresponding rotor pole by establishing a preselected magnitude of current such that when the current in the winding reaches that magnitude, the switches are disabled. The voltage at the DC bus is regulated during generator mode operation by adjusting the phase angle measured between a stator pole and a corresponding rotor pole at which the switches are gated into conduction.

Abstract: A numerical control system controls a plurality of axes with a plurality of channels (10, 20, 30). When a machining program for a first channel (10) is interrupted after a single block in response to a single block signal (6), the feeding of commands of a machining program for other channels (20, 30) is held. The machining programs are thereby executed in synchronism with each other. The machining processes are prevented from being unbalanced, and machining interference is avoided.