Abstract: The hole drilling process is for drilling a hole on a supported tube sheet by using a first drilling tool that can drill a hole with a diameter smaller than that of a mounting hole that is to become a target hole, and a second drilling tool that can drill a hole with a diameter equal to the diameter of the target hole, the process including: a temporary hole drilling step in which a temporary hole with a predetermined depth set beforehand is drilled by moving the first drilling tool to a drilled position set beforehand; a hole measuring step in which a distance (S) between an existing mounting hole and the temporary hole; a drilled position correcting step in which the drilled position is corrected based upon the distance (S) between the mounting hole and the temporary hole.

Abstract: Presented is a system and method for controlling an actuator in a multirate control system using an integrated upsampler and filter, comprising an incremental command limiter for changing a command from a first control system into a limited incremental command in a second control system, a lead-lag filter for filtering the limited incremental command to attenuate high frequencies, and a feed forward path for reducing phase loss in rate output signal at low frequencies. In embodiments, a command position signal received at the sampling rate of the first control system is interpolated into incremental command position signals at the sampling rate of the second control system. Position error signals and rate error signals from the devices being controlled are used as feedback to further stability the control loops.

Abstract: Various systems and methods for reducing cross coupling in proximate signals are disclosed. As one example, a system for reducing cross-coupling in adjacent signals that includes an active slew rate limiter circuit is disclosed. The active slew rate limiter circuit is operable to receive an input signal, and to provide an output signal based on the input signal with a controlled slew rate. In some cases, such systems may be included within a storage device that includes a read head. In such cases, the systems may operate to assure a substantially constant power dissipation within the read head.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: A circuit and method for providing drive currents to a polyphase dc motor are presented. The circuit (40) includes a circuit for generating a user-defined waveform first. signal in synchronism with a reference frequency signal. A reference frequency signal generator (62) generates pulses of a second signal at a reference frequency. A commutation circuit (56) combines segments of the first and second signals, and a circuit (64) is provided for applying the combined sinusoidal/trapezoidal waveforms to coils of the polyphase dc motor in a commutative sequence. Preferably, the user-defined waveform, when combined with the second signal, has approximately a sinusoidal/trapezoidal waveform.

Abstract: Apparatus and method for providing digital signal processing method for controlling the speed and phase of a motor involves inputting a reference signal having a frequency and relative phase indicative of a time based signal; modifying the reference signal to introduce a slew-rate limited portion of each cycle of the reference signal; inputting a feedback signal having a frequency and relative phase indicative of the operation of said motor; modifying the feedback signal to introduce a slew-rate limited portion of each cycle of the feedback signal; analyzing the modified reference signal and the modified feedback signal to determine the frequency of the modified reference signal and of the modified feedback signal and said relative phase between said modified reference signal and said modified feedback signal; and outputting control signals to the motor for adjusting said speed and phase of the motor based on the frequency determination and determination of the relative phase.

Abstract: A system and method for providing rotation control stability within a disk drive. In accordance with the system of the present invention, a disk storage medium on which information is recorded is driven to rotate by a multiphase-phase DC servomotor. An actuator is utilized for loading and unloading the head to and from the disk storage medium. A load/unload controller commands the actuator to load or unload said head. In order to effectively compensate for an abrupt change in load on the servomotor caused by loading the head onto the disk storage medium, a slew rate switching unit is utilized to alter a slew rate of current supplied to the three-phase DC servomotor, based on a loading start command issued by the load/unload controller.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: A method and apparatus for controlling an insertion device includes the steps of providing sensors for providing respective signals in accordance with selected events associated with the operations and providing a plurality of motor profiles for operation of motors associated with the operations. Respective motors associated with respective operations of the apparatus are driven in correspondence with selected ones of said plurality of motor profiles for controlling driving of said motors in response to receiving the event signals from the sensors and other modules of the control program. In the event of out of tolerance conditions the envelope can be diverted and another substituted without having to shut down and restart the system at a known place.

Abstract: A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of a selected high side driving transistor is charged at a relatively high rate during a ramping phase. During the ramping phase, the gates of the selected transistor is charged to a voltage near the voltage needed to form a channel in the transistor for conduction. After the ramping phase, the gates are charged at a lesser rate in order to control the rate of charging of the stator coils to prevent noise.

Abstract: A power drive device is disclosed that includes a motor, a control device coupled to the motor, and a rotatable reference axle member rotatably interlocked with the rotation of the motor. A first detection member detects a first phase and a third phase of rotation of the reference axle member wherein the first phase corresponds to a rotation starting position of the reference axle member and the third phase corresponds to a near completion position of the reference axle member. The device also includes a second detection member that detects a second phase and a fourth phase of rotation of the reference axle member, wherein the fourth phase of rotation corresponds to a rotation completion position of the reference axle member. The control device drives the motor in accordance with the detected phases of the first and second detection members, and in particular, can control the velocity of the motor and the timing of the operation of the motor in relation to a second motor.

Abstract: The invention relates to a recording apparatus for effecting recording on a recording material. The recording apparatus comprises a stepping motor, a recording head capable of reciprocating along the recorded material by a drive force of the stepping motor to effect recording on the recording material, an angular position detector for detecting a rotated angular position of a rotor of the stepping motor, a controller for controlling drive of the stepping motor in a closed-loop manner dependent on the detected result of the detector, a controller for operating the stepping motor in a mode of stepwise motor drive, a movement position detector for detecting a movement position of the recording head, and switching circuitry for switching over between the closed-loop control and the stepwise motor drive dependent on the detected value of the movement position detector.

Abstract: A drive controller for a stepping motor having a plurality of excitation phases which designate stepping positions thereof, includes a motor driver for sequentially exciting the excitation phases to rotate the stepping motor in increments of one step angle, and a control section for controlling the motor driver to set an excitation interval. When the control section sets the excitation interval to be shorter than an interval of a stepping range in which the stepping motor temporarily stops for each increment, the stepping motor is driven in a slewing mode in which the rotation of the stepping motor is continued without stopping for each increment.

Abstract: An actuator'rate is controlled by a rate servo and the actuator's position is controlled by a position control. The position control can be a position servo or a mechanical brake. Selection of either the rate servo or position control is made by fuzzy switching logic.

Abstract: A drive circuit for servomotors that eliminates the need for microswitches to protect the motor when the system is driven to its limits of travel. The circuit monitors the current to the motor, identifies overload currents and terminates current flow to the motor when an overload occurs. The current flow is restored only when a reverse rotation command signal is received by the drive circuit.

Abstract: A lens apparatus for moving one or more moving lenses of a lens system up to the end position of movement by a servomotor. The lens apparatus limits the moving speed of the moving lens or lenses to a value under a predetermined level. Also, the lens apparatus gradually reduces the moving speed as the moving lens or lenses approach the end position so that the moving lens element or elements can be stopped precisely at the end position.

Abstract: A system for performing target acquisition and tracking under the control a human operator. The system has a slewable sensor with a line of sight and includes apparatus for slewing the sensor to align its line of sight with a target, the difference between the position of the target and the line of sight being a line of sight error. A display displays the line of sight error to the operator at either a first or a second magnification, selectable by the operator. The operator uses a control manipulator to generate input signals and supply them to the rest of the system. Circuitry is provided for automatically switching from proportional to proportional-plus-integral control upon changing from the first to the second magnification. Circuitry is also provided for initializing an integrator prior to the switchover from the first to the second magnification to eliminate control transients in the concomitant switchover from proportional to proportional-plus-integral control.

Abstract: For recording instruments fed from a 50 Hz or 60 Hz supply mains it is proposed to use a control unit of substantially entirely digital structure for the transport of the record carrier, for example paper, with the use of a stepping motor. A simple 300 Hz or 600 Hz oscillator which is synchronized with the mains and a frequency divider enable various paper speeds to be set, slow or fast paper transport for adjusting purposes being simply realized by controlling the frequency of the oscillator. Several functions can be remotely controlled.

Abstract: A control method of a DC motor is described which comprises a digital control method and an analogue control method, wherein a rotor of the DC motor rotates with high speed under the digital control method until the rotating angle of the rotor comes close to a predetermined rotating angle and then the rotor rotates with high accuracy under the analogue control method to the predetermined rotating angle.