Abstract: A motor driven linear actuator comprises an electric motor, a ballscrew device, and a rolling bearing. The electric motor includes a motor shaft having a first end portion. The first end portion includes an end surface and a receptacle having a first accommodation space. The ballscrew device includes a screw having a first end portion coaxially connected to the first end portion of the motor shaft. The first end portion of the screw includes a first section to be accommodated in the first accommodation space for fixing the screw with the motor shaft. The rolling bearing is disposed between the electric motor and the ballscrew device for supporting the first end portion of the screw. The end surface of the motor shaft contacts and abuts against the rolling bearing for limiting the movement of the rolling bearing between the electric motor and the ballscrew device.

Abstract: A rotary motor includes a rotor and at least one stator. The rotor has a shaft. The stator has an iron core and a coil wound around the iron core. A cross section of the iron core perpendicular to the shaft has a long axis and a short axis, and the rotor is disposed on an extension line of the long axis.

Abstract: A robot joint utilized in a robot arm is disclosed. The robot joint includes a hollow shaft, a first gear, plural motors, plural second gears, an encoder, and a digital signal processor. The first gear is fixed on the hollow shaft. The motors are arranged surrounding the hollow shaft. Each of the motors has a rotating shaft. The second gears are fixed on the rotating shaft and are engaged with the first gear, so that the hollow shaft can be rotated with the second gears driven by the motors. The encoder is disposed at a side of one of the motors opposite to the second gears. The signal detected by the encoder is sent to the digital signal processor for driving the motors. A robot arm using the robot joint is also disclosed.

Abstract: A plastic product manufacturing method includes (a) providing a cloud server which stores a machine number and machine parameters of an all-electric injection-molding machine that includes a controller; (b) downloading the machine parameters from the cloud server according to the machine number; (c) executing mold flow analysis software to generate model data and optimal injection conditions of a mold according to the machine parameters; (d) setting a mold number and a password to the model data and the optimal injection conditions and then storing the same in the cloud server after packaging; (e) connecting to the cloud server using the machine number, the mold number, and the password by the controller; (f) downloading the optimal injection conditions to the controller after the cloud server confirms the machine number, the mold number, and the password; and (g) driving the all-electric injection-molding machine by the controller according to the optimal injection conditions.

Abstract: A method of calculating recovery commands for numerical controlled system that an upper controller provides position commands to a servo driver to drive a motor. A memory space is provided to store the position commands, and then a position matrix and a transformation matrix are read. Finally, the transformation matrix is multiplied by the position matrix to calculate the coefficients of a position polynomial and a plurality of position interpolations. In addition, a velocity polynomial and an acceleration polynomial can be calculated. Therefore, the position commands are calculated to recovery as a high-order differentiable continuous polynomial to synchronize the servo driver and the upper controller.

Abstract: A method of calculating recovery commands for numerical controlled system that an upper controller provides position commands to a servo driver to drive a motor. A memory space is provided to store the position commands, and then a position matrix and a transformation matrix are read. Finally, the transformation matrix is multiplied by the position matrix to calculate the coefficients of a position polynomial and a plurality of position interpolations. In addition, a velocity polynomial and an acceleration polynomial can be calculated. Therefore, the position commands are calculated to recovery as a high-order differentiable continuous polynomial to synchronize the servo driver and the upper controller.

Abstract: A three-in-one AC servo drive includes a main console, a control module, a power module and a plurality of servo motors. A single drive can be connected to a plurality of motors. The power module and control module for the motors can be integrated to a single modular unit. Therefore, the redundant portion such as communication interface, display unit and I/O unit can be eliminated. The capacitor of the bus of the IGBT module can also be reduced, whereby the occupied space and cost can be reduced with less assembling time.

Abstract: An optical encoder includes a controller electrically connected to an optical sensor to discriminate displacement information of a glass disc. The controller comprises a pair of analog amplifiers for amplifying quadrature periodical output signals of the optical sensor, a pair of A/D converters electrically connected to the analog amplifiers for digitalizing the output of the analog amplifiers, a pair of hysteresis comparators electrically connected to the optical sensor for performing hysteresis comparison for the output of the optical sensor, an up/down counter electrically connected to the pair of hysteresis comparators for up/down counting the output of the hysteresis comparators and a firmware unit electrically connected to the pair of A/D converters and the up/down counter for performing interpolation for the quadrature periodical output signals and counting for the hysteresis compared signals. Therefore, optical encoded result of higher resolution can be achieved.

Abstract: A self-synchronous AC servo system is used for high-speed serial communication and has multiple axes control. The system includes a computer sending command to master axis drive and slave axis drive through a transmission line. The master axis drive and slave axis drive send interrupt request to the computer through the transmission line after receiving the command. Each drive will judge whether the command is for it self according to the interrupt request and stores a plurality of computer commands in queue. Each drive drives master axis motor or slave axis motor by the queued command synchronously according to a synchronous timing clock.

Abstract: A method for estimating load inertia and system for controlling motor speed using inverse model are provided, suitable for an alternating current (AC) servo module. An inverse system is connected to an actual system to inversely deduce a substantial torque output, wherein when the value of the speed signal generated by the actual system gradually increases, a net inertia ratio is accumulated; whereas when the value of the speed signal generated by the actual system increases to a fixed value, the net inertia ratio is updated.

Abstract: A method of instant estimation of the rotor inertia of a load motor is disclosed. The adaptive filter accompanied with the Least Mean Square Rule is introduced to instantly estimate the rotor inertia of a load motor. One input of the adaptive filter is the current signal of a model motor whose rotor inertia is known, and the other is the deviation current signal between the model motor and the drive motor. Once the two inputs are determined, the rotor inertia of the load motor will then be calculated using the Least Mean Square Rule and the adaptive filter.

Abstract: A method of instant estimation of the rotor inertia of a load motor is disclosed. The adaptive filter accompanied with the Least Mean Square Rule is introduced to instantly estimate the rotor inertia of a load motor. One input of the adaptive filter is the current signal of a model motor whose rotor inertia is known, and the other is the deviation current signal between the model motor and the drive motor. Once the two inputs are determined, the rotor inertia of the load motor will then be calculated using the Least Mean Square Rule and the adaptive filter.

Abstract: A massaging device to eliminate fat on a human body is disclosed. The massaging device comprises a substantially T-shaped hold boy, a rotating motor, a bowl-shaped seat body, a massaging wheel seat, and a netlike cap. The massaging wheel is in contact with the human body so as to massage the body. A controller is provided at an appropriate section of the power source cable of the device, facilitating the user to control the power supply of the massaging device.

Abstract: A massaging device to eliminate fat on a human body is disclosed. The massaging device comprises a substantially T-shaped hold boy, a rotating motor, a bowl-shaped seat body, a massaging wheel seat, and a netlike cap. The massaging wheel is in contact with the human body so as to massage the body. A controller is provided at an appropriate section of the power source cable of the device, facilitating the user to control the power supply of the massaging device.