A variable speed accelerator includes an electric driving device and a transmission device. The electric driving device includes a constant-speed motor rotating a constant-speed input shaft of the transmission device in a first direction, and a variable-speed motor having a variable-speed rotor connected to a variable-speed input shaft of the transmission device and rotating an output shaft of the transmission device at a maximum rotation rate by rotating the variable-speed rotor at a maximum rotation rate in a second direction. The accelerator includes a power source line connecting the variable-speed motor with a power source so that the variable-speed motor rotates in the second direction, a rotation rate controller, and a bypass line connecting the variable-speed motor with the power source so that the variable-speed motor rotates in the first direction.

A variable speed accelerator includes an electric driving device and a transmission device. The electric driving device includes a constant-speed motor rotating a constant-speed input shaft of the transmission device in a first direction, and a variable-speed motor having a variable-speed rotor connected to a variable-speed input shaft of the transmission device and rotating an output shaft of the transmission device at a maximum rotation rate by rotating the variable-speed rotor at a maximum rotation rate in a second direction. The accelerator includes a power source line connecting the variable-speed motor with a power source so that the variable-speed motor rotates in the second direction, a rotation rate controller, and a bypass line connecting the variable-speed motor with the power source so that the variable-speed motor rotates in the first direction.

A drive shaft rotates a load. A drive support rotates the drive shaft and supports a radial load of the drive shaft in a non-contact manner, by an electromagnetic force generated by the flow of a current within a predetermined current range through the drive support. A control section controls an operation of the load based on a magnetic flux margin degree expressed by the difference between a total magnetic flux amount generated at the drive support and a predetermined limit of the total magnetic flux amount for the drive support. The total magnetic flux amount includes driving magnetic flux and the supporting magnetic flux in a predetermined operation region of the load. The driving magnetic flux is generated at the drive support for rotating the drive shaft. The supporting magnetic flux is generated at the drive support for supporting a radial load of the drive shaft.

This variable electric motor system includes an electrically powered device (50) and a planet gear transmission device (10). One of a sun gear shaft (12), a planet gear carrier shaft (27), and an internal gear carrier shaft (37) of the planet gear transmission device constitutes an output shaft (Ao), another shaft constitutes a constant-speed input shaft (Ac), and another shaft constitutes a variable-speed input shaft (Av). The electrically powered device includes: a constant-speed electric motor (51) including a constant-speed rotor (52) that rotates about the axis (Ar), and connected to the constant-speed input shaft; and a variable-speed electric motor (71) including a variable-speed rotor (72) that rotates about the axis, and connected to the variable-speed input shaft. The variable-speed rotor has a shaft insertion hole (74) formed in the axial direction, the hole having a cylindrical shape centered on the axis. The constant-speed rotor is inserted through the hole.

This variable electric motor system includes an electrically powered device (50) and a planet gear transmission device (10). One of a sun gear shaft (12), a planet gear carrier shaft (27), and an internal gear carrier shaft (37) of the planet gear transmission device constitutes an output shaft (Ao), another shaft constitutes a constant-speed input shaft (Ac), and another shaft constitutes a variable-speed input shaft (Av). The electrically powered device includes: a constant-speed electric motor (51) including a constant-speed rotor (52) that rotates about the axis (Ar), and connected to the constant-speed input shaft; and a variable-speed electric motor (71) including a variable-speed rotor (72) that rotates about the axis, and connected to the variable-speed input shaft. The variable-speed rotor has a shaft insertion hole (74) formed in the axial direction, the hole having a cylindrical shape centered on the axis. The constant-speed rotor is inserted through the hole.

A starting method for a variable speed accelerator includes an electric device that generates a rotational drive force, and a transmission device that shifts the rotational drive force generated by the electric device to transmit the changed speed to an object to be driven. The transmission device includes a sun gear that rotates about an axis, a sun gear shaft that is fixed to the sun gear and extends in an axial direction, a planetary gear that meshes with the sun gear, revolves around the axis, and rotates about its own center axis, and an internal gear that has a plurality of teeth aligned annularly about the axis and meshes with the planetary gear.

A starting method for a variable speed accelerator includes an electric device that generates a rotational drive force, and a transmission device that shifts the rotational drive force generated by the electric device to transmit the changed speed to an object to be driven. The transmission device includes a sun gear that rotates about an axis, a sun gear shaft that is fixed to the sun gear and extends in an axial direction, a planetary gear that meshes with the sun gear, revolves around the axis, and rotates about its own center axis, and an internal gear that has a plurality of teeth aligned annularly about the axis and meshes with the planetary gear.

A system for variable speed drives using generators adjusting the motor frequency having a plurality of main generators 1, 2, 3 and 4 as the means of adjusting a plurality of AC motors frequency, a processor is provided that opens a main bus tie breaker in a power system to create two separate power systems, power source A and power source B, wherein power source a is powered by a generator 1 and a generator 2. and power source b is powered by a generator 3 and a generator 4, wherein the generators 1-4 are configured to operate on a droop curve wherein the output frequency of the generator is slightly reduced as the load increases.

A motor control apparatus includes a switching unit configured to selectively switch a motor driving one main axis between two motors, a position detection unit configured to detect position information of the main axis, two motor control units provided correspondingly to each of the two motors, an abnormality detection unit configured to detect abnormality of a motor driving the main axis between the two motors, and a safety control unit configured to switch the motor driving the main axis, from the motor in which the abnormality is detected to a motor in which no abnormality is detected, and configured to stop the motor in which no abnormality is detected to stop the main axis, when the abnormality detection unit detects abnormality of the motor driving the main axis.

A drive device includes a first motor, a second motor, and circuitry. The first motor includes a first rotation detector and is configured to rotate a driven shaft to apply a driving torque to the driven shaft. The second motor includes a second rotation detector and is configured to rotate the driven shaft to reduce backlash between the first motor and the driven shaft. The circuitry is configured to control the first motor and the second motor, based on a detection signal of the second rotation detector.