Abstract: Embodiments of present invention may provide a motor control drive circuit for driving a motor by receiving signals from a digital signal control device. The motor control drive circuit includes a switching unit receiving signals that have undergone pulse width modulation (PWM signals) in the digital signal control device, and converting a switching state based on the input signals; and a controller receiving from the switching unit switching operational signals that vary according to a duty ratio of the PWM signals, receiving digital signals from the digital signal control device, and varying a voltage gain for control of the drive motor. In the motor control drive circuit of one embodiment of the present invention, motor rotation is controlled by the duty ratio of digital signals without the use of a DAC. This allows for the design of an independent digital signal processing device, and enables compatibility with various digital signal processing devices.

Abstract: A sound attenuating duct unit suitable for connection to an outlet of a gas turbine and an improved heat recovery apparatus for use with such a turbine are disclosed. The former unit includes a duct housing having exterior sides, an air inlet at one end and first and second air outlets. Interior walls define a main airflow passageway extending from the air inlet to both of the outlets. Sound absorbing and heat insulation material is arranged between these walls and the exterior sides. Sound attenuating members are mounted in the passageway and a diverter damper is mounted in the housing and is able to direct air flow to either one of the air outlets. The sound attenuating members are mounted between the diverter damper and the air inlet. The heat recovery apparatus includes a series of aerodynamic diffusers mounted in a housing adjacent an air flow inlet connectable to the gas turbine.

Abstract: An acoustic isolator is placeable between a sound producing body and a resting surface. The acoustic isolator includes a foam member having a first surface for receiving the sound producing body and a second surface for engaging the resting surface. The foam member is composed of a supportive foam member capable of substantially preventing the transfer of sound induced vibrations between the sound producing body and the resting surface while sustaining an internal deflection of less than about thirty percent.

Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, in executing driving, an ideal profile of the driving is generated in accordance with a target position and a preset initial parameter, driving of the motor is controlled in accordance with the profile, the value of the initial parameter is evaluated at the end of driving, and the value of the initial parameter is changed in accordance with the evaluation result. High-speed accurate position control can be achieved independently of the characteristic of an individual motor to be used.

Abstract: A serially connected double-phase full-wave brushless dc motor includes a first drive member, a second drive member, a first sensor member, a second sensor member, a first motor coil and a second motor coil. The first drive member is connected to a power source to thereby obtain a first voltage, and connected to the first sensor member and the first motor coil. The first drive member is further in serial connection with a second drive member and a second sensor member, and provides with a second voltage thereto. The second drive member is connected to the second sensor member and the second motor coil. Hall signals of the first and second sensor members are in control of an alternative direction of the first and second motor coils for conduction, and thereby the first and second motor coils are synchronously excited in full wave by the first and second voltages respectively.

Abstract: An electric vehicle includes a drive-motor driving device and a compressor-driving device for air-conditioning. Both of these driving devices share a smoothing capacitor and a radiator. The drive-motor driving devices, the compressor-driving device, and the smoothing capacitor are disposed in a shielding case against electromagnetic wave, so that the electric circuit of the vehicle can be downsized and light-weighted.

Abstract: An exhaust gas muffler for an engine, the exhaust gas muffler having a body, at least one inlet for the exhaust gas from the engine on the body, a baffled chamber in the body to receive exhaust gas from the at least one exhaust gas inlet, at least one exhaust gas outlet from the baffled chamber to vent the exhaust gas from the baffled chamber, at least one fresh-air inlet on the body, a heat exchange conduit extending into the baffled chamber between the fresh air inlet and the at least one exhaust gas outlet, the heat exchange conduit being sized and shaped to permit heat exchange between the fresh air and the exhaust gas in the baffled chamber, and a fresh air outlet on the heat exchange conduit, the fresh air outlet being sized, shaped and located relative to the exhaust gas outlet to permit the fresh air to mix with exhaust gases being vented from the baffled chamber to lower an exit temperature of the exhaust gases.

Abstract: This invention relates to windshield wiper system which utilizes a flexible drive arm for withstanding bending loads applied to a wiper. The drive arm may be made of a pull-molded composite material having a relatively low modulus of elasticity and a relatively high elongation factor. The flexible arm twists in the presence a bending load and undergoes rapidly progressing elastic buckling when the bending load exceeds a predetermined amount.

Abstract: The invention concerns a method for regulating the rotation speed, of a motor with which a digital rotation speed controller is associated and which, during operation, furnishes an actual-value signal for the rotation speed in the form of a rotation speed frequency signal, toward a target rotation speed setpoint defined in the form of a setpoint frequency signal, having the following steps: in a first time segment, a first numerical frequency value that characterizes the rotation speed of the motor is ascertained from the rotation speed frequency signal; in a second time segment that is substantially simultaneous with the first time segment, a second numerical frequency value that characterizes the frequency of the setpoint frequency signal is ascertained from the setpoint frequency signal; by means of the first and second numerical frequency values, the rotation speed of the motor is regulated in the digital rotation speed controller to a rotation speed that is associated with the setpoint frequency signal a

Abstract: A motor torque control apparatus and method are disclosed. By adding the value of the compensation voltage which is obtained by proportionally integrating a difference value between the predetermined reference magnetic flux component current value and the actually measured magnetic flux component current value to the q-axis instructing voltage, the magnetic flux component current, that is, the excitation current, can be constantly controlled without excess or shortage. In addition, since the magnetic flux is constantly controlled irrespective of the speed of the motor, a high torque can be generated even at the initial stage of starting of the motor (at the low speed), and thus, the torque of the motor can be smoothly controlled in every operation range from a low speed to a high speed.

Abstract: A control system in the form of an all-digital phase-locked loop controls movement of a DC motor. The control system includes a movement detector in the form of an optical encoder to detect movement of a DC motor. A digital phase detector compares output of a feedback signal from the movement detector and a reference signal. The digital phase detector is phase frequency detector that follows a describing function to model non-linear components of the reference signal. A digital loop filter then filters noise from the comparison signal and the filtered signal is amplified to control the DC motor. The phase frequency detector includes a state machine to track a time varying reference signal and selectively output a response to provide for system damping.

Abstract: A shape memory foam member is disclosed. A coefficient of water absorption of the shape memory foam member is in the range between 0.01 g/cm3 and 0.2 g/cm3 in a non-compressed state. The shape memory foam member is compressed with heating; cooled with keeping the shape memory foam member in the compressed state; and released from the compressive pressure on the shape memory foam member after cooling. The original shape of the shape memory foam member is substantially recovered by heating.

Abstract: In a method for active compensation of mechanical vibrations and/or deformations in industrial processing machines, a main drive in a primary axis executes a first motion to move a mechanical machine element with an auxiliary drive in a secondary axis for execution of a second comparably more fine-tuned motion to move a machine point by the auxiliary drive in such a way that the movement of the machine point is composed of superimposed portions of the first and second motions. The first motion of the machine point moves hereby in accordance with a predetermined desired position value, and the second motion so compensates vibrations and/or deformation of the mechanical machine point that the machine point assumes the desired predetermined position.

Abstract: A portion of a chassis comprised of a material forming a portion of the exterior of the chassis and a high-density flexible material adjacent an inner surface of the portion of the chassis with air holes formed contiguously through both the portion of the chassis and the high-density flexible material.

Abstract: A controller for a motor is provided. The motor includes N redundant M-phase rotor/stator combinations (where N and M are both integers greater than 1). The controller includes N driver circuits each having M outputs. Each of the M outputs of a respective one of the N driver circuits provides pulse-width modulated (PWM) current pulses to a corresponding phase winding in a respective one of the redundant M-phase rotor/stator combinations. Furthermore, the controller includes a control unit operatively coupled to the N driver circuits for providing phase spacing between the N driver circuits. As a result, current pulses provided by the N driver circuits to a same phase winding in each of the redundant M-phase rotor/stator combinations are offset in phase.

Abstract: There is provided a print control unit capable of transferring and stopping an object to be controlled at a target position when unexpected load is applied to the object. A print control unit includes: a selection control part, operating at a predetermined timing, to select and set the control parameters in accordance with the target speed, to judge as to whether the object is located within a target range, based on the output of the position detecting part, if located, the selection control part selecting and operating the third control part, while if the object is not located within the target range, the selection control part selecting and operating the first or the second control part based on the physical value corresponding to the speed.

Abstract: Parameter set 1: T1a, T2a, Fa, Aa, parameter set 2: T1b, T2b, Fb, Ab, and parameter set 3: T1c, T2c, Fc, Ac, which consist of parameters having discrete values in three stages (large, medium and small) are prepared in the memory for example of the CNC 1 or the personal computer 3. For a given parameter set, the set giving priority to accuracy (S=0) is indicated by P (T1p, T2p, Fp, Ap), while the set giving priority to speed (S=1) is indicated by Q (T1q, T2q, Fq, Ag), and interpolation is performed and the parameter set Y=(1−S)×P+S×Q is obtained. The CNC 2 creates operating commands based on set Y and outputs these to the servo control section 2.

Abstract: A method and apparatus for operating a motor controller to cause balanced positive and negative current half-cycles in a motor phase, the method comprising the steps of, for an occurring half-cycle, identifying the most recently obtained valid shut-off angle, identifying the fire angle immediately preceding the identified shut-off angle, mathematically combining the identified fire angle and the identified shut-off angle to identify a next virtual zero crossing (VZC) angle, mathematically combining the next VZC angle and the notch angle to determine a fire angle for the occurring half-cycle and repeating the method for the next half-cycle.

Abstract: A control algorithm provides automatic control of the turn-on angle used to excite the switched-reluctance motor (SRM). The control algorithm determines the turn-on angle that supports the most efficient operation of the motor drive system, and consists of two pieces. The first piece of the control technique monitors the position of the first peak of the phase current (&thgr;p) and seeks to align this position with the angle where the inductance begins to increase (&thgr;m). The second piece of the controller monitors the peak phase current and advances the turn-on angle if the commanded reference current cannot be produced by the controller. The first piece of the controller tends to be active below base speed of the SRM, where phase currents can be built easily by the inverter and &thgr;p is relatively independent of &thgr;m. The second piece of the controller tends to be active above base speed, where the peak of the phase currents tends to naturally occur at &thgr;m, regardless of the current amplitude.

Abstract: The present invention discloses a system and method for confining a robot to a particular space. The system includes a portable barrier signal transmitter that produces a barrier signal primarily along an axis, and a mobile robot capable of avoiding the barrier signal upon detection of the barrier signal. In the preferred embodiment the barrier signal is emitted in an infrared frequency and the robot includes an omni-directional signal detector. Upon detection of the signal, the robot turns in a direction selected by a barrier avoidance algorithm until the barrier signal is no longer detected.