Abstract: An antenna module includes a first metal plate and a frame body. The frame body surrounds the first metal plate. The frame body includes a first antenna radiator, a second antenna radiator, a third antenna radiator, a first breakpoint and a second breakpoint. The first antenna radiator includes a first feeding end and excites a first frequency band. The second antenna radiator includes a second feeding end and excites a second frequency band. The third antenna radiator includes a third feeding end and excites a third frequency band. The first breakpoint is located between the first antenna radiator and the second antenna radiator. The second breakpoint is located between the second antenna radiator and the third antenna radiator. An electronic device including the above-mentioned antenna module is also provided.

Abstract: An electronic device including a bracket and an antenna is provided. The bracket includes first, second, third, and fourth surfaces. The antenna includes a radiator. The radiator includes first, second, third, and fourth portions. The first portion is located on the first surface and includes connected first and second sections. The second portion is located on the second surface and includes third, fourth, fifth, and sixth sections. The third section, the fourth section, and the fifth sections are bent and connected to form a U shape. The third portion is located on the third surface and is connected to the second section and the fourth section. The fourth portion is located on the fourth surface and is connected to the fifth section, the sixth section, and the third portion. The radiator is adapted to resonate at a low frequency band and a first high frequency band.

Abstract: A component-embedded packaging structure is provided, in which a plurality of metal layers are formed on an inactive surface of a semiconductor chip so as to serve as a buffer portion, and the semiconductor chip is disposed on a carrying portion with the buffer portion via an adhesive. Then, the semiconductor chip is encapsulated by an insulating layer, and a build-up circuit structure is formed on the insulating layer and electrically connected to the semiconductor chip. Therefore, the buffer portion can prevent delamination from occurring between the semiconductor chip and the adhesive on the carrying portion if the semiconductor chip has a CTE (Coefficient of Thermal Expansion) less than a CTE of the adhesive.

Abstract: A static auto-tuning system and method for controlling operation of a motor in a system. A speed reference signal is generated resulting in a speed response of the motor. Closed-loop feedback magnifies the rotating friction effect to an observable level. Inertia and rotating friction coefficient values of the system are estimated based on the speed frequency response and a virtual damping coefficient. A fixed low frequency speed signal may result in a first frequency response function for determining virtual damping, and a variable frequency excitation signal may result in a second frequency response function for determining the inertia and rotating friction characteristics. Closed-loop gains are determined based on these characteristics. The excitation signal may be sampled and a peak value in each interval may be identified and stored to produce an envelope of peak values for determining the gain response. Operation of the motor is controlled using the determined gains.

Abstract: An optical transceiver includes a housing, a mother board, an optical communication module and a daughter board. The mother board is accommodated in the housing. The optical communication module is disposed on a top surface of the mother board, and the optical communication module includes a first electrical interface. The daughter board is disposed on the top surface of the mother board, and the daughter board includes a second electrical interface electrically connected with the first electrical interface. The optical communication module is disposed on a flat region of the top surface of the mother board.

Abstract: An optical transceiver includes a housing, a mother board, an optical communication module and a daughter board. The mother board is accommodated in the housing. The optical communication module is disposed on a top surface of the mother board, and the optical communication module includes a first electrical interface. The daughter board is disposed on the top surface of the mother board, and the daughter board includes a second electrical interface electrically connected with the first electrical interface. The optical communication module is disposed on a flat region of the top surface of the mother board.

Abstract: A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.

Abstract: A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current.

Abstract: A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current.

Abstract: A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current.

Abstract: A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.

Abstract: A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.

Abstract: A position sensorless drive systems for a permanent magnet motors are disclosed. An embodiment includes a square wave voltage source connectable to an input of a permanent magnet motor. At least one current sensor is connectable to the motor, wherein the current sensor is configured to sense the current in at least one power line to the motor in response to the square wave input to the motor. The position of the rotor relative to the stator may be determined based on the current resulting from the square wave voltage.

Abstract: A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current.

Abstract: A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.

Abstract: A permanent magnet motor for position sensorless drive operation provides a stator design that exhibits a saliency (machine asymmetric) functionally dependent on rotor position as caused by periodic magnetic saturation of stator structure. This saturation property is caused by rotor zigzag leakage flux from surface permanent magnets. The stator structure may be designed to further saturate from zigzag leakage flux to provide greatest spatial saliency in the quadrature phase for motor position sensorless position estimation. The position, velocity, and shaft torque can be extracted by measuring the phase current from the stator coil of permanent magnet motor.

Abstract: A permanent magnet motor for position sensorless drive operation provides a stator design that exhibits a saliency (machine asymmetric) functionally dependent on rotor position as caused by periodic magnetic saturation of stator structure. This saturation property is caused by rotor zigzag leakage flux from surface permanent magnets. The stator structure may be designed to further saturate from zigzag leakage flux to provide greatest spatial saliency in the quadrature phase for motor position sensorless position estimation. The position, velocity, and shaft torque can be extracted by measuring the phase current from the stator coil of permanent magnet motor.

Abstract: In an interactive system for interacting with a printed material having at least a visual icon associated with predetermined response data, there is an ultrasonic pointing unit positionable over the at least one visual icon and arranged for generating ultrasonic wave. An ultrasonic positioning base unit is arranged for receiving the ultrasonic wave from the ultrasonic pointing unit and determining a position of the ultrasonic pointing unit based on the received ultrasonic wave. A is arranged for locating, in a data storage, the response data corresponding to the visual icon according to the position of the ultrasonic pointing unit. A response unit is arranged for outputting the response data.

Abstract: Present invention provides an improved ultrasonic receiving unit for ultrasonic distance measurement. The ultrasonic receiving features a high peak detection unit 120, a low peak detection unit 125, an arrival time adjustment unit 130. With those features, detection error caused by single threshold could be eliminated.

Abstract: Present invention provides an ultrasonic input device for information display. The ultrasonic input device includes a stylus 140, an ultrasonic receiving unit 130. The stylus further includes a piezoelectric disk element 210 that vibrates toward a circular opening 225 of a housing 220. A reflective structure 240 supported by a base 250 reflects the vertical plane wave 310 to become 360 degree horizontal plane wave 320. There are pillars 230 for interconnecting a supportive base 250 and the housing 220.