Abstract: The present invention relates to a method of controlling the speed of rotation of a piezoelectric motor comprising at least one step of determining the variation of the speed of rotation as a function of the frequency of the excitation voltages of the piezoelectric motor for the actual temperature of the piezoelectric material.

Abstract: A motor driving system includes a storage unit, a driver, and a controller. The driver includes a first programmable logic device (PLD). The controller includes a second PLD. The storage unit stores a control program. The controller generates a first transmission data to the first PLD and a second transmission data to the second PLD according to the control program. The first PLD generates a first message packet including the first transmission data. The second PLC generates a second message packet including the second transmission data. The first and second PLDs communicate with each other using a full duplex transmission mode or a half duplex transmission mode.

Abstract: An impact tool (100) includes a spindle (11), a motor (1), a rotational impact system (10), a current detecting unit (32), and a current control unit (31). The spindle extends in an axial direction thereof. The motor provides the spindle with a rotational power in accordance with a motor current flowing therethrough. The rotational power rotates the spindle about the axis at an rpm value. The rotational impact system provides the spindle with an impact force in the axial direction, thereby transmitting both the rotational power and the impact force to an end bit. The current detecting unit detects a current value of the motor current. The current control unit reduces the current value if the current value detected by the current detecting unit exceeds a predetermined value.

Abstract: An integrated printed circuit board-based solid state line voltage interface for use in automation control system applications. Relays connect various functional loads to the line level source in response to input from a controller unit. Switches enable a user to override the controller and manually control the connection of the functional loads. An alternative embodiment further includes limit switches and time delays. The compact nature of the device facilitates ease of installation, mounting of multiple units in less space, and mounting in various specialized location as desired.

Abstract: The present invention provides a motor drive apparatus which improves a trade-off relation between a stable position detection and noise at its driving. A sensorless drive operation circuit calculates by operation a zero cross point (point p) of a voltage of a position detection phase at the next interval, using time information measured based on an output signal from a comparison circuit at the previous interval and the present interval. After the point p has been calculated, points a and b are detected by interrupting a predetermined time drive current.

Abstract: A controller computes a pinching amount of an object caused by a window glass. The controller estimates a prior pinching amount of the object caused by the window glass before the controller computes the pinching amount of the object. The controller confirms occurrence of the pinching of the object based on the computed pinching amount and the estimated prior pinching amount of the object.

Abstract: A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arrangement further includes a command control interface configured to receive commands from a command control unit wherein the commands correspond to a desired speed. The control and motor arrangement still further includes a plurality of detectors configured to detect speed information of the motor, and a process control arrangement configured to receive the speed information from the sensors. The process control arrangement is further configured and arranged to generate a plurality of motor control signals based on the speed information for controlling the speed of said motor. The control and motor arrangement yet still further includes a motor control arrangement configured to cause power to be applied to the motor at different times in response to the motor control signals.

Abstract: A digital motor control system utilizes at least two variable pulse generators to produce two streams of pulse width modulated pulses to control the motor speed and direction of rotation of a motor. An input control signal may be compared with two reference signals, such as two waveforms which are inverted with respect to each other, to produce two streams of pulse width modulated signals. A logic circuit combines the two streams of pulses. In one embodiment, depending on the input control signal level, where the two streams do not overlap, reverse motor control signals are produced and where the two streams overlap, forward motor control signals are produced. As the pulse widths of the pulse width modulated pulses change, the motor may receive continuous power in one direction, slow down, stop, and then increase speed in the opposite direction until it receives continuous power in the other direction. The variable pulse generators may be of various types including one-shot multivibrators and comparators.

Abstract: A motor driving system includes a storage unit, a driver, and a controller. The driver includes a first programmable logic device (PLD). The controller includes a second PLD. The storage unit stores a control program. The controller generates a first transmission data to the first PLD and a second transmission data to the second PLD according to the control program. The first PLD generates a first message packet including the first transmission data. The second PLC generates a second message packet including the second transmission data. The first and second PLDs communicate with each other using a full duplex transmission mode or a half duplex transmission mode.

Abstract: The present invention discloses that the output end of the electric motor capable of being operated in bidirectional rotation is transmitted to the input end of different rotating speed ratio and direction output transmission device, and it is through the output end of the different rotating speed ratio and direction output transmission device to further provide different directional rotating output for driving the rotating load, wherein the user can operatively control the driving input direction to provide different rotating directional different speed change ratio output in different driving input direction.

Abstract: An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds.

Abstract: The invention relates to a method and a device for controlling an electric door drive. During a learning process determination of the course over time of the torques of the door drive for each of at least one opening process and closing process is carried out. Maximum permissible torques are derived from the ascertained torques for predetermined zones within an opening process and closing process. During operation of the door drive a comparison of the current torque with the maximum torques and a comparison of the current speeds of the door drive with predetermined target speeds are carried out. The current speed of the door drive is increased if the associated target speed is fallen below. In addition, switching-off the door drive takes place if the current torque exceeds the associated maximum torque.

Abstract: An integrated PCB-based solid state line voltage interface for use in automated control system applications. Relays connect various functional loads to the line level source in response to input from a controller unit. Switches enable a user to override the controller unit, and manually control the connection of the functional loads. An alternative embodiment of the present invention further includes limit switches. The compact nature of the device facilitates ease of installation, mounting of multiple units in the same space, and mounting in various specialized locations as desired.

Abstract: A system for controlling the rotation speed of a shredder motor is disclosed. It consists of a bridge rectifier circuit, a forward/reverse controlling switch, a motor speed switch, and AC motor coils. By changing a switch, it is possible to activate the following four modes: forward fast, reverse fast, forward slow, and reverse slow. A user can thus operate a shredder at high torque and low rotation speed or high rotation speed and low torque depending on the number of sheets to be shredded.

Abstract: A system for controlling a displacement drive of a motor vehicle includes a manually operable actuator movable over a fixed stroke between a first end position and a second end position. The actuator is biased to a neutral position centrally located between the first and second end positions and provides a signal representative of position of the actuator. A controller receives the signal from the actuator and produces commands for a reversible DC electric motor of the displacement drive device. The commands vary speed of the drive motor based on the position of the actuator such that the speed of the drive motor is zero at the neutral position, increases in one direction as the actuator moves toward the first end position, and increases in the other direction as the actuator moves toward the second end position.

Abstract: An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds.

Abstract: An apparatus is provided and includes a power source, a system board on which an electrical component is installed, a heat sink including a plurality of heat transfer surfaces to contact the electrical component and to thereby remove heat from the electrical component, a fan reversing control card coupled to the system board and configured to generate normal and reverse cycle rotation signals, and a fan coupled to the fan reversing control card and configured to receive the normal and reverse cycle rotation signals and to thereby operate in normal and reverse cycles in which the fan rotates in first and second directions, respectively, the fan being disposed within the computer such that the first and second directional rotations of the fan generate air flows in first and second directions with respect to the heat transfer surfaces, respectively.

Abstract: A three-in-one control device for a ceiling fan includes a signal receiving module, which is able to receive segmented controlled signals, stepless controlled signals and wireless controlled signals respectively, for transmitting controlled signals to a micro computer control unit to process, analyze and code them. Then, the processed signals are transmitted to a driving unit to drive the blades of the ceiling fan to rotate. Therefore, when a control switch is replaced with another type, it is unnecessary to change the control device but just connect it to a corresponding control module, able to save manufacturing cost.

Abstract: In one embodiment, the present invention describes a gate closure system having a barrier or gate operator for moving a gate between a gate fully opened position and a gate fully closed position. The gate closure system preferably further includes, among other things, a master control board with input and output points to receive and transmit data associated with movement of the gate, including a panic control override mode circuit input to the master control board that negates all gate movement parameters during any portion of the gate's travel path to open or close the gate at a substantially greater rate of speed than typically used to open or close the gate during normal operation, regardless of the gate's speed, torque, direction of travel (forward or backward), or whether the gate is stationary.

Abstract: A method for controlling a fan is provided for adjusting the rotational speed of a fan. The method includes adjusting the rotational speed of the fan from a first mode value to a range of rotational speed variation, wherein the upper bound of the range of rotational speed variation is a second mode value plus a first variation value, and the lower bound of the range of rotational speed variation is the second mode value minus a second variation value; and adjusting the rotational speed of the fan in the range of rotational speed variation during a time period. Thus, a user will not consider the sound from the fan as a noise.

Abstract: A control unit for a moveable barrier, such as a garage door, includes a microcontroller connected to a motor speed detector, motor current sensor or a sensor for determining forces exerted on or by the barrier. A user interface includes user actuatable switches for setting a first maximum force value to be exerted on or by the barrier when moving in one direction and the microcontroller automatically sets the value of a second maximum force to be exerted on or by the barrier when moving in the opposite direction. The second force value may be based on the force value set by the user or the second force value may be a preset value. Both force limits may be automatically set as a function of a maximum force exerted on said barrier during movement thereof, during a force learning operation.

Abstract: A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on a system clock signal to permit control parameters of the selected axis to be processed to control the selected motor drive axis. The single unit PWM control mechanism eliminates complex and costly multiple axis networks typically associated with independent servo motor controls for each axis in a multi-axis system. A single PWM unit implementation also permits the reduction of components for closed loop current control and closed loop velocity control in the multi-axis servo control system.

Abstract: A measurement arrangement for accurate and repeatable measurement of transmission and reception characteristics of a communication device. The arrangement comprises an at least partly conductive box forming a substantially enclosed cavity, and arranged in the box a reference antenna, at least one conducting mode mixer and/or at least one mode mixer with absorbing material.

Abstract: A first judging unit integrates an increase in a corrected current when the corrected current is in a predetermined increasing state and judges that a first condition is satisfied when an integrated increase exceeds a threshold. A second judging unit integrates a decrease in door moving speed when the door moving speed is in a predetermined decreasing state and judges that a second condition is satisfied when an integrated decrease exceeds a threshold. A third judging unit integrates a decrease in motor rotation speed when the motor rotation speed is in a predetermined decreasing state and judges that a third condition is satisfied when an integrated decrease exceeds a threshold. A pinch judging unit judges whether pinch has occurred based on determination by the first, the second, and the third judging units.

Abstract: A system and method of restarting a switched reluctance motor after a cycling of power provided to the motor is provided that includes receiving at the motor a power-off signal followed by a power-on signal, determining a rotational speed of a rotor, and energizing a stator only when the rotational speed of the rotor is determined to be less than a threshold speed.

Abstract: A safety garage door apparatus includes a garage door, two tracks, a controller, a linking device and a detecting device. Two tracks are installed on two sides of the garage door, respectively. The controller includes a motor, a driving device connected to the motor, and a microprocessor. The linking device includes a rail, a rack slidably mounted in the rail, and a linkage with one end connected to the rack and the other end connected to the garage door. The rack is connected with the driving device. The detecting device is mounted in the controller to continually detect a location of the rack so that a moving speed of the rack is determined by the microprocessor to compare with a predetermined rate to determined whether an operation of opening or closing the garage door needs to be stopped or reversed, or a maintenance of the garage door apparatus is needed.

Abstract: In a motor and a disk drive apparatus in accordance with the present invention, a position detecting part 30 comprises a detection signal switching circuit 39A, a noise elimination circuit 38 and a detection circuit 39B, and the detection signal switching circuit 39A is configured to output an inverted detection signal obtained by logically inverting a detection signal until the rotation speed reaches a predetermined rotation speed after the beginning of starting or until a position detection pulse signal FG is detected a predetermined number of times; position detection operation is carried out only during the ON operation of PWM, whereby PWM sensorless starting is carried out.

Abstract: A method for speed control for a motor of a locomotive of a model electric train is presented. A method in accordance with the present invention includes sensing an operating velocity of the motor and the operating current provided to the motor, and then producing a signal corresponding to the operating velocity and a signal corresponding to the operating current. A method in accordance with the present invention further includes providing the operating velocity signal and operating current signal to a controller and establishing a target motor velocity. A method in accordance with the present invention still further includes calculating a target current configured so that the motor reaches the target motor velocity, and then changing the operating current to the target motor current to achieve the target motor velocity.

Abstract: An apparatus, method and program product position a powered examination chair at a constant, desired speed despite fluctuations line voltage. A power signal supplied to an actuating motor of the chair is apportioned according to the line voltage supplied to the chair. The desired speed may be customized by a user in the field.

Abstract: Asynchronous motors are controlled by way of two- or three-phase controllers that include at least two pair of thyristors connected in antiparallel and fired at certain intervals. According to the inventive method, a fundamental wave with the desired frequency is defined for the first phase and in the other phase a respective fundamental wave is defined that has the same frequency as that in the first phase, but phase-shifted by corresponding values. For every phase, firing intervals are marked that have the same polarity as the respective fundamental wave. Those intervals of the potential firing intervals are used for every phase at which there is a potential firing interval in one of the two other phases. These intervals are used as the actual firing intervals.

Abstract: A ventilator having an abnormal operation indication device includes a power supply circuit, a central processing unit, a fan motor, and a load sensing circuit. Thus, the load sensing circuit detects the abnormal operation signals through the sensor, so that the abnormal operation indication lamp on the panel of the ventilator lights, so as to indicate that the part of the ventilator is disposed at an abnormal operation state and needs to be inspected and amended, thereby facilitating inspection and maintenance of the parts of the ventilator.

Abstract: An opening and closing control device of opening and closing member for a vehicle includes a motor for actuating the opening and closing member, and a control unit for driving the motor so as to become a predetermined target speed and for driving the motor in reverse direction as a detection of entrapped obstacles when the actual speed of the motor reaches to an entrapment judgment speed which is set lower than the target speed. The control unit sets a threshold speed which is higher than the target speed and outputs an output duty to the motor for achieving the target speed by feedback control. The control unit switches the output duty after the actual speed of the motor becomes higher than the threshold speed to an output by feedforward control based on the target speed.

Abstract: A pulse width modulated (PWM) output signal controller circuit is provided for controlling operation of an electronically commutated, direct current (DC) motor. This DC motor may be used for operating cooling fans in sensitive electronic equipment. The controller circuit maintains the motor speed as constant resulting in a minimizing of the motor power consumption and resultant noise generation. Controller circuit output PWM signals are maintained at a constant pulse width even in the presence of variations in the voltage levels supplied to the controller circuit. The controller circuit includes a current pulse sensor circuit that senses changes in current direction in a motor coil. This current pulse sensor's output is input to a monostable multivibrator circuit that produces a chain of constant height output pulses (PWM signals).

Abstract: A movable barrier operator having improved safety and energy efficiency features automatically detects line voltage frequency and uses that information to set a worklight shut-off time. The operator automatically detects the type of door (single panel or segmented) and uses that information to set a maximum speed of door travel. The operator moves the door with a linearly variable speed from start of travel to stop for smooth and quiet performance. The operator provides for full door closure by driving the door into the floor when the DOWN limit is reached and no auto-reverse condition has been detected. The operator provides for user selection of a minimum stop speed for easy starting and stopping of sticky or binding doors.

Abstract: A movable barrier operator (11) receives movement sensing signals from a sensor (13) and calculates corresponding speed of movement of a movable barrier. Such speed measurements lead to development of a median speed value over a monitoring window. The median speed value is used in a subsequent monitoring window to facilitate determining when speed of movement for the movable barrier has slowed in a way that likely corresponds to the movable barrier having encountered an obstacle.

Abstract: A controller for a shutter moved between an opened position and a closed position. A plurality of location ranges is defined between the opened position and the closed position. The controller detects the current moving speed of the shutter in each range, compares the moving speed with a predetermined reference speed, and generates a stop signal based on the comparison result to stop the movement of the drive mechanism.

Abstract: A blender base that may be used with a food processor container, a blender container, and a single use beverage container. The blender container includes a novel blade unit having a food processor-style blade and blender type blades. Programs with preprogrammed motor commands for desired operations are stored in memory and may be selected by a user on a user interface. The user interface may include a liquid crystal display, or function switches and light emitting diodes. Upon selection of a particular pre-defined function, the microcontroller retrieves the appropriate program from the read only memory and specifies the preprogrammed motor commands to accomplish the selected function.

Abstract: Asynchronous motors are controlled by way of two- or three-phase antiductors that comprise at least two pair of thyristors connected in antiparallel and fired at certain intervals. According to the inventive method, a fundamental wave with the desired frequency is defined for the first phase and in the other phase a respective fundamental wave is defined that has the same frequency as that in the first phase but phase-shifted by corresponding values. For every phase, firing intervals are marked that have the same polarity as the respective fundamental wave. Those intervals of the potential firing intervals are used for every phase at which there is a potential firing interval in one of the two other phases. These intervals are used as the actual firing intervals.

Abstract: A motor speed control system 10 includes a permanent magnet direct current electric motor 12. A first switch 14 is operatively associated with the motor. A resistive element 16 is provided in series with the motor and the first switch. A second, pulse width modulated controlled, switch 18 is operatively associated with the motor. A controller 20 is operatively associated with the first and second switches for controlling the first and second switches independently and in combination to control current to the motor to operate the motor at various speeds.

Abstract: A motor speed control system 10 includes a permanent magnet direct current electric motor 12. A first switch 14 is in series with the motor. A circuit 15 is in series with the first switch 14. The circuit 15 includes a resistor 16 and a second, pulse width modulated controlled, switch 18 in parallel with the resistor 16. An electronic controller 20 is operatively associated with the first and second switches for electronically controlling the first and second switches independently and in combination to control current to the motor to operate the motor at various speeds.

Abstract: A wireless terminal including a custom integrated circuit for adjusting and applying the voltage of a particular pulse and a power supply for supplying power to operate an internal vibration embodying circuit, the terminal includes: a switching circuit unit for controlling the motor action in the vibration embodying circuit: a current amplification unit for supplying a great current necessary for the driving of the motor; a driving motor unit for performing vibration by driving the vibration embodying circuit; an overcurrent protecting unit for maintaining a stable voltage in the motor when overvoltage is applied to an input and protecting the motor by interrupting said driving motor unit; and a battery pack, connected externally to the power supply, for supplying charges to the power supply unit by mounting the vibration embodying circuit therein.

Abstract: Method of detecting obstructions encountered by a motorized door. The method includes providing a signal processor with one or more signals indicative of a predetermined door trajectory profile for at least a segment of a stroke of the door, the door trajectory profile providing an ideal speed and/or position versus an elapsed time since a beginning of the segment of the stroke. A door position signal from a position encoder for the door is received into the signal processor. The method includes generating one or more signals indicative of the velocity and/or position of the door from the door position signal and generating a trajectory discrepancy signal based on the velocity and/or position in relation to the ideal speed and/or position. A motor control signal is generated based on the trajectory discrepancy signal and the motor control signal is connected to motor control circuits connected to drive the motor for the door.

Abstract: Method of controlling a motorized door by offloading the burden to a separate motion control processor. The method includes generating, in a central processor for the door, one or more signals indicative of a predetermined door speed profile for a stroke of the door. The predetermined door speed profile provides an ideal velocity versus an elapsed time since a beginning of the stroke. The signals are communicated to a motion control processor and the motion control processor also receives door position signals from a position encoder. The motion control processor generates signals indicative of the velocity of the door based on the door position signals and it generates error signals based on discrepancies between the velocity of the door and the ideal velocity. It generates motor control signals based on the error signals and the motor control signals are communicated to the motor of the door.

Abstract: A method is proposed for influencing the electrical power of a load with the assistance of a pulse-width modulated signal, the latter including the requirement of a continuous turn-on signal. The method provides that the continuous turn-on signal is terminated by an interrupt signal and that the continuous turn-on signal is followed by a clock-pulse phase having at least one fundamental period duration of the pulse-width modulated signal, the period including a turn-off time. The occasional interruption of the pulse-width modulated signal, which is present as the continuous turn-on signal, makes it possible to detect an operational quantity of the load that only arises during a power change in the load.

Abstract: A motor rotation control device for an optical disk player including a motor outputting rotation signals, a sensor for sensing the rotational direction and rotational state of the motor in response to rotation signals of the motor, a motor control signal generator for generating a motor control signal according to the rotational direction and rotational state of the motor, and a motor rotation controller for controlling the rotation of the motor in response to the motor control signal. The motor rotation control device operates independently of a system controller, thereby reducing the load on the system controller.

Abstract: The method for controlling a motor driving a load holds the speed of the output shaft of the motor substantially constant as the torque imposed upon the shaft by the load varies, then regulates the rate of change of the output torque delivered by the motor's output shaft based on the sensed value of output torque as the motor's speed decreases.

Abstract: A movable barrier operator having improved safety and energy efficiency features automatically detects line voltage frequency and uses that information to set a worklight shut-off time. The operator automatically detects the type of door (single panel or segmented) and uses that information to set a maximum speed of door travel. The operator moves the door with a linearly variable speed from start of travel to stop for smooth and quiet performance. The operator provides for full door closure by driving the door into the floor when the DOWN limit is reached and no auto-reverse condition has been detected. The operator provides for user selection of a minimum stop speed for easy starting and stopping of sticky or binding doors.

Abstract: A direction control device for a ceiling fan is disclosed, which has a remote receiver arranged inside a canopy of the ceiling fan and a direction control circuit unit arranged in a switch box of the ceiling fan. The conducting wires of the remote receiver and the connection lines of the fan motor are both electrically connected to the direction control circuit unit via a hanger rod of the ceiling fan without being redirected and the rotation direction of the ceiling fan can be remotely controlled.

Abstract: A highly dependable motor drive system capable of driving a motor with certainty even in a submersion accident and preventing overcurrent from flowing to the motor on the occasion of switching the direction of rotation. It is so arranged that, of a first and second relay for rotating the motor in the normal and reverse directions, respectively, in response to operation of associated switches, the first relay is selectively actuated and the second relay is de-energized. As the associated switch is operated, the energization of the coil of the second relay is maintained for a while by the function of a bypass circuit so that the actuation of the second relay is stopped only after actuation of the first relay with a transient motor stand-still time therebetween.

Abstract: The present invention provides a focusing controller for a survey instrument, and the focusing controller comprises a sliding tube for retaining a focusing lens and movable in the direction of an optical axis, a motor for moving the sliding tube in the direction of the optical axis, a motor driving control circuit for driving the motor, a rotating speed control switch which serves as a means for inputting coarse adjustment control to the driving circuit, and a rotating position control switch which serves as a means for inputting fine adjustment control to the motor driving circuit, whereby the focusing lens is moved at a speed proportional to rotating angle of a rotating speed control switch by turning the rotating speed control switch for coarse control, and the focusing lens is moved to a position corresponding to rotating angle of a rotating position control switch by turning the rotating position control switch for fine control.