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| Number | Title | Issue Date |
| 7158328 | Multi-phase acceleration of a data storage disc A disc drive having a multi-phase acceleration procedure is disclosed. The multi-phase acceleration procedure accelerates a data storage disc in the disc drive from an initial rotational velocity to a final rotational velocity. As the disc reaches the final rotation... | 01/02/2007 |
| 7133236 | Storage device control method, motor control method, and storage device Embodiments of the invention avoid erroneous drive current control at the time of a change in the drive waveform for a spindle motor. In one embodiment, a drive current setup section acquires the actual rotational speed from a rotational speed determination section.... | 11/07/2006 |
| 7054250 | Method and device for jitter enhancement in an optical disc system A method and device are provided for jitter enhancement in an optical disc system. The optical disc system generates a signal that includes an effective component having a first slew rate, and a pre-pit component having a second slew rate larger than the first slew ... | 05/30/2006 |
| 6844696 | Electromagnetic alignment and scanning apparatus 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 co... | 01/18/2005 |
| 6844695 | Electromagnetic alignment and scanning apparatus 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 co... | 01/18/2005 |
| 6628096 | Linear sinusoidal waveform spindle driver and method for driving a polyphase, brushless DC motor using commutation currents with user controlled rise and fall times 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 signa... | 09/30/2003 |
| 6605920 | Method and apparatus for large motor control 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 signa... | 08/12/2003 |
| 6411056 | System and method for stabilizing disk drive rotation control 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 ac... | 06/25/2002 |
| 6329780 | Electromagnetic alignment and scanning apparatus 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 ... | 12/11/2001 |
| 5982129 | Asynchronous control of insertion apparatus 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... | 11/09/1999 |
| 5859511 | Motor with input-controlled high side driver 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... | 01/12/1999 |
| 5773940 | Power drive device 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... | 06/30/1998 |
| 5416395 | Carriage drive control for a printer 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 moto... | 05/16/1995 |
| 5289095 | Fuzzy switching logic for servo systems 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 swi... | 02/22/1994 |
| 4645992 | Electronically controlled servomotor limit stop 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 t... | 02/24/1987 |
| 4412164 | Lens system driving device 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 appar... | 10/25/1983 |
| 4283670 | Automatic integrator control for transientless switching of _controller gains in manual tracking systems 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 betwe... | 08/11/1981 |
| 3982166 | Control unit for paper transport 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... | 09/21/1976 |
| 3953774 | Control method of a DC motor 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... | 04/27/1976 |
