A coaxial double-rotor variable-speed electromagnetic drive includes an external rotor, an end cover, a load shaft, a stator, and an internal rotor, the external rotor, the load shaft, the stator, and the internal rotor being coaxially arranged. The end cover includes a first end cover and a second end cover that are respectively disposed at two ends of the drive, the external rotor is slidably connected to the two end covers separately by bearings, the load shaft is slidably connected to the first end cover and the inner side of the external rotor separately by bearings, the stator is fixed on the inner side of the first end cover and disposed inside the external rotor, air gaps are kept separately between the stator and the internal rotor and between the stator and the external rotor, the internal rotor is sleeved on the load shaft and is disposed inside the stator.

An excitation system (15) is disclosed for providing excitation to a main rotating electrical machine (2). The excitation system comprises an exciter (50) and an auxiliary generator (52). The exciter and the auxiliary generator have separate stator cores (14, 18) and share a common rotor core (16). The common rotor (16) core may be located between the two stator cores (14, 18). This may help to optimize space, improve material usage and reduce the total rotating mass. A mounting arrangement for the common rotor core is also disclosed.

A generator set for generating an alternating current, includes a primary power unit, an alternating current generator, and a secondary power unit. The alternating current generator is rotationally coupled to the primary power unit, and converts power provided by the primary power unit into an electric power. The secondary power unit is connectable to the alternating current generator so as to increase the power generated by the alternating current generator.

A generator set for generating an alternating current, includes a primary power unit, an alternating current generator, and a secondary power unit. The alternating current generator is rotationally coupled to the primary power unit, and converts power provided by the primary power unit into an electric power. The secondary power unit is connectable to the alternating current generator so as to increase the power generated by the alternating current generator.

An electric drive device includes a motor housing including a housing end face part opposite to an output part of a rotating shaft of an electric motor. The housing end face part includes a power conversion circuit part heat dissipation section and a power supply circuit part heat dissipation section formed to allow at least generated heat of the power conversion circuit part and the power supply circuit part to be transferred to the motor housing. A sensor magnet is fixed to an end part of the rotating shaft opposite to the output part of the rotating shaft and structured to constitute a rotation-sensing target part for sensing rotation of the rotating shaft. The power conversion circuit part heat dissipation section of the housing end face part is positioned closer to the electric motor than the sensor magnet.

The invention provides a power generation method and a system equipped with energy storage and energy release accommodation mechanism. By using an energy storage and energy release accommodation system arranged in the system, the generator set at an end of the system can immediately supplement energy from an energy storage unit after providing electric energy to a load, so that the output energy will not drop suddenly, while still stably maintaining both the rated energy output and the system operation.

The invention provides a power generation method and a system equipped with energy storage and energy release accommodation mechanism. By using an energy storage and energy release accommodation system arranged in the system, the generator set at an end of the system can immediately supplement energy from an energy storage unit after providing electric energy to a load, so that the output energy will not drop suddenly, while still stably maintaining both the rated energy output and the system operation.

A sea wave power generating apparatus comprises a frame, a platform secured on an upper portion of the frame, a floating panel pivotally secured to the frame and flapping upwardly or downwardly by the oscillation of the sea waves, a level controlling device slidably held on the platform for raising or lowering the floating panel to be normally submerged under a sea water level, and a power generating device mounted on the platform and having a rack pivotally secured to a rear portion of the floating panel and engaged with a pinion of the power generating device for converting the kinetic energy due to the upward or downward flapping movements of the floating panel into electrical energy.

A sea wave power generating apparatus comprises a frame, a platform secured on an upper portion of the frame, a floating panel pivotally secured to the frame and flapping upwardly or downwardly by the oscillation of the sea waves, a level controlling device slidably held on the platform for raising or lowering the floating panel to be normally submerged under a sea water level, and a power generating device mounted on the platform and having a rack pivotally secured to a rear portion of the floating panel and engaged with a pinion of the power generating device for converting the kinetic energy due to the upward or downward flapping movements of the floating panel into electrical energy.

[Object] To provide a compact, high-output actuator device allowing force control.

[Solution] An actuator device 1000 includes an electromagnetic coil member 110 provided over a prescribed width on an outer circumference of a cylinder 100, and a movable element 200 slidable as a piston in the cylinder 100. The movable element 200 has a magnetic member 202, and is moved relatively by excitation of the electromagnetic coil member 110. Fluid is supplied to first and second chambers 106a and 106b such that when the movable element 200 is to be moved relatively, the movable element 200 is driven in the same direction.