Abstract: A method for controlling outputs of electric motors includes the steps of (a) providing an electric motor including a stator winding unit selected from first to fourth winding groups, each of the winding groups having at least a primary winding with a first number of poles and a first rated power, and at least a secondary winding with a second number of poles being the same as or different from the first number of poles and a second rated power being the same as or different from the first rated power; and (b) providing a control device respectively coupled with the electric motor and an external electrical power source for sensing a needed loading state of the electric motor and suppling a required connection relationship between the stator winding unit and the external electrical power source based on the needed loading state sensed by the control device.

Abstract: A magnetic power electricity generating system comprises an electrical machine unit and a control unit. The electrical machine unit comprises a first electrical machine with a first operating mode and a second operating mode. The first operating mode is that the first electrical machine is operated in a motor operating mode and the second operating mode is that the first electrical machine is operated in a motor operating mode and a generator operating mode simultaneously. The control unit is electrically connected respectively to the electrical machine unit and an external power supply for controlling the first electrical machine to be operated in the first operation mode or in the second operation mode. The magnetic power electricity generating system may further comprise a first flywheel coupled with the first electrical machine to enable the first electrical machine to supply electrical energy to external loadings.

Abstract: A bearing includes a ring unit including an outer ring and an inner ring. The inner ring is surrounded by the outer ring and shares a common axis. The outer ring includes at least one first recess, and the inner ring includes at least one second recess. Each of the at least one first recess and the at least one second recess is filled with a first durable material elements by way of welding. At least one roller unit including multiple rollers which rolls between the inner and outer rings. The rollers contact the multiple first durable material elements. The hardness of the multiple first durable material elements and the hardness of the rollers are higher than that of the ring unit so as to increase the life of use of the bearing and reduce manufacturing cost.

Abstract: A motor arrangement system of an endurable and energy-saving electric vehicle includes a motor unit, a detection unit, and a control unit. The motor unit includes a number of motor devices and a speed-change device. The detection unit includes a rotational speed detector that detects a rotational speed to output a rotational speed signal and an operation detector that detects an electric current of the motor devices to output an operation signal. The control unit controls supply of electric power to one to some of the motor devices according to confirmation of the rotational speed signal and the operation signal. As such, a desired number of motor devices can be selected according to a desired level of horsepower, to thereby help reduce energy consumption and also to share the risk and cost of maintenance.

Abstract: A motor device includes a stator unit including a plurality of first slots, a rotor unit rotatable relative to the stator unit, a winding unit, and a transfer switch unit. The winding unit includes first and second windings installed in the first slots. Number of poles of the first winding is less than that of the second winding. The transfer switch unit is electrically connected to the first and second windings, and is controlled to allocate access to electricity to each of the first and second windings.

Abstract: A front wheel transmission turning device for a vehicle is adapted to be coupled to a transmission shaft and installed at a vehicle wheel, and includes a plurality of balls, an outer annular seat having a plurality of angularly spaced-apart outer grooves, and an inner annular seat having a plurality of angularly spaced-apart inner grooves. A quantity of the balls is not smaller than three, and a quantity of the outer grooves is a multiple of and larger than the quantity of the balls. The balls are equiangularly arranged and each of the balls is removably received between a corresponding one of the outer grooves and a corresponding one of the inner grooves.

Abstract: A roll-and-press friction-driving harmonic drive gear reducer includes: a wave generator having an elliptical external contour; a flexible spline having an output end and an open annular wall connected to the output end, the open annular wall having an external circumferential surface that includes an external roll-and-press area in an annular form, the external roll-and-press area including an annular section of external teeth adjacent to an end edge and a circumferential external curved surface adjacent to the annular external teeth; and a circular spline, which has an end that is recessed to form an accommodation hole that is inwardly extended, the accommodation hole having an internal circumferential surface that includes an internal roll-and-press area, the internal roll-and-press area including an annular section of internal teeth adjacent to an end edge and a circumferential internal curved surface adjacent to the set of internal teeth.

Abstract: A CNC milling machine includes a chassis unit having vertical seats. A machining unit includes a frontward-rearward movable machining seat located on the vertical seats, a leftward-rightward movable machining seat in front of the frontward-rearward movable machining seat, an upward-downward movable machining seat in front of the leftward-rightward movable machining seat, and a machining tool set at a bottom of the upward-downward movable machining seat. A picking robotic arm unit includes a frontward-rearward movable picking seat located on the vertical seats and in front of the frontward-rearward movable machining seat, a leftward-rightward movable picking seat above the frontward-rearward movable picking seat, an upward-downward movable picking seat adjacent to the leftward-rightward movable picking seat, and a claw set at a bottom of the upward-downward movable picking seat. Coupling achieved with a coupling unit allows the picking robotic arm unit to be driven to move by the machining unit.

Abstract: A CNC milling machine includes a chassis unit having vertical seats. A machining unit includes a frontward-rearward movable machining seat located on the vertical seats, a leftward-rightward movable machining seat in front of the frontward-rearward movable machining seat, an upward-downward movable machining seat in front of the leftward-rightward movable machining seat, and a machining tool set at a bottom of the upward-downward movable machining seat. A picking robotic arm unit includes a frontward-rearward movable picking seat located on the vertical seats and in front of the frontward-rearward movable machining seat, a leftward-rightward movable picking seat above the frontward-rearward movable picking seat, an upward-downward movable picking seat adjacent to the leftward-rightward movable picking seat, and a claw set at a bottom of the upward-downward movable picking seat. Coupling achieved with a coupling unit allows the picking robotic arm unit to be driven to move by the machining unit.

Abstract: A ball screw includes a screw having a primary spiral groove. A first nut unit includes a first nut and first balls. The first nut has a first spiral groove. The first balls are located in the first spiral groove and contact the inner surface of the first spiral groove by a first contact angle. A second nut unit includes a second nut and second balls. The second nut has a second spiral groove. The second balls are located in the second spiral groove and contact the inner surface of the second spiral groove by a second contact angle which is different from the first contact angle. When a first wearing trace is formed along the screw by the first balls, the first nut unit is replaced with the second nut unit. A second wearing trace is formed along the screw and not overlapped with the first wearing trace.

Abstract: A motor device includes a stator unit including a plurality of first slots, a rotor unit rotatable relative to the stator unit, a winding unit, and a transfer switch unit. The winding unit includes first and second windings installed in the first slots. Number of poles of the first winding is less than that of the second winding. The transfer switch unit is electrically connected to the first and second windings, and is controlled to allocate access to electricity to each of the first and second windings.

Abstract: A ball screw includes a screw having a primary spiral groove. A first nut unit includes a first nut and first balls. The first nut has a first spiral groove. The first balls are located in the first spiral groove and contact the inner surface of the first spiral groove by a first contact angle. A second nut unit includes a second nut and second balls. The second nut has a second spiral groove. The second balls are located in the second spiral groove and contact the inner surface of the second spiral groove by a second contact angle which is different from the first contact angle. When a first wearing trace is formed along the screw by the first balls, the first nut unit is replaced with the second nut unit. A second wearing trace is formed along the screw and not overlapped with the first wearing trace.

Abstract: A CNC single-turret twin-spindle efficiency-doubled metal processing machine includes: a chassis having a Z-axis mounting surface and a Y-axis mounting surface perpendicular to the Z-axis mounting surface; a spindle driving source mounted on the Z-axis mounting surface of the chassis; a first spindle unit arranged on the Z-axis mounting surface of the chassis and coupled to the spindle driving source; a second spindle unit arranged on the Z-axis mounting surface of the chassis and coupled to the spindle driving source so that the spindle driving source is operable to simultaneously drive the first spindle unit and the second spindle unit to do reciprocal movement on the same axis for approaching and leaving; a turret unit mounted on the Y-axis mounting surface of the chassis and including a plurality of clamp groups arranged at predetermined angles. Each of the clamp groups includes two tool clamps that respectively clamp two identical tools.

Abstract: A C-type CNC machine center generally includes a chassis, a displaceable table, a work table, a working spindle, a coupling seat, and a driver device. The chassis has a working area, a power area, and a displacement channel communicating with the working area and the power area. The displaceable table is slidably mounted to the chassis and located in the working area. The coupling seat is slidably coupled to the base seat in the power area and includes an elongate hollow body and is fixedly mounted, with an end thereof, to the displaceable table. The driver device includes a motor mounted to the base seat in the power area and a ball screw coupled to the motor and the coupling seat to drive the coupling seat and the displaceable table to synchronously conduct reciprocal movement in a given direction. The coupling seat separates the ball screw from the working area.

Abstract: A linear slide rail includes a rail having four primary grooves respectively defined in two opposite sides of the rail. A first slide includes a first passage, and each of two opposite insides of the first passage has two first grooves. Multiple first balls contact the primary grooves and the first grooves. Each of the first grooves has a first contact angle. When a first wearing trace is formed along the rail by the first balls and the first slide, the first slide and the first balls are replaced with a second slide and multiple second balls. Each of the second grooves of the second slide has a second contact angle which is different from the first contact angle. A second wearing trace is formed along the rail by the second balls and the second slide. The first and second wearing traces are not overlapped with each other.

Abstract: A roll-and-press friction-driving harmonic drive gear reducer includes: a wave generator having an elliptical external contour; a flexible spline having an output end and an open annular wall connected to the output end, the open annular wall having an external circumferential surface that includes an external roll-and-press area in an annular form, the external roll-and-press area including an annular section of external teeth adjacent to an end edge and a circumferential external curved surface adjacent to the annular external teeth; and a circular spline, which has an end that is recessed to form an accommodation hole that is inwardly extended, the accommodation hole having an internal circumferential surface that includes an internal roll-and-press area, the internal roll-and-press area including an annular section of internal teeth adjacent to an end edge and a circumferential internal curved surface adjacent to the set of internal teeth.

Abstract: A C-type CNC machine center generally includes a chassis, a displaceable table, a work table, a working spindle, a coupling seat, and a driver device. The chassis has a working area, a power area, and a displacement channel communicating with the working area and the power area. The displaceable table is slidably mounted to the chassis and located in the working area. The coupling seat is slidably coupled to the base seat in the power area and includes an elongate hollow body and is fixedly mounted, with an end thereof, to the displaceable table. The driver device includes a motor mounted to the base seat in the power area and a ball screw coupled to the motor and the coupling seat to drive the coupling seat and the displaceable table to synchronously conduct reciprocal movement in a given direction. The coupling seat separates the ball screw from the working area.

Abstract: A computer numerical control (CNC) servo drive system includes a controller, a driver, a co-connection circuit, a first servo motor and a second servo motor. Users input a control command through the controller. The driver is connected to the controller, converts the control command into a drive signal, and outputs the drive signal. The co-connection circuit is connected to the driver and transmits the drive signal. A sum of maximum current values of the first servo motor and the second servo motor is not greater than a maximum current value of the driver, such that the driver can simultaneously drive the first servo motor and the second servo motor for operation.

Abstract: A computer numerical control (CNC) servo drive system includes a controller, a driver, a co-connection circuit, a first servo motor and a second servo motor. Users input a control command through the controller. The driver is connected to the controller, converts the control command into a drive signal, and outputs the drive signal. The co-connection circuit is connected to the driver and transmits the drive signal. A sum of maximum current values of the first servo motor and the second servo motor is not greater than a maximum current value of the driver, such that the driver can simultaneously drive the first servo motor and the second servo motor for operation.

Abstract: A CNC dual-spindle transmission device is installable on a CNC dual-spindle machining center to receive first and second spindles of the CNC dual-spindle machining center to mount thereto. The CNC dual-spindle machining center includes a base, a machining table movably mounted on the base, and a vertical column erected upright at a rear portion of the base. The CNC dual-spindle transmission device includes a linear rail assembly mounted to the vertical column, a first slide seat slidably mounted to the linear rail assembly and receiving the first spindle to mount thereto, a second slide seat extending across the first slide seat and slidably mounted to the linear rail assembly in a manner of being spaced from the first slide seat to receive the second spindle to mount thereto, and first and second power units mounted to the vertical column to respectively driven the first and second slide seats to move.