Abstract: An electric power converter has a semiconductor module having a semiconductor element integrally and at least a pair of semiconductor terminals, a capacitor electrically connected to the semiconductor module, and a cooler that thermally contacts to at least one of a plurality of capacitor terminals provided in the capacitor. The capacitor terminals that thermally contact the cooler are arranged between the cooler and the capacitor.

Abstract: An electric power converter has a semiconductor module having a semiconductor element integrally and at least a pair of semiconductor terminals, a capacitor electrically connected to the semiconductor module, and a cooler that thermally contacts to at least one of a plurality of capacitor terminals provided in the capacitor. The capacitor terminals that thermally contact the cooler are arranged between the cooler and the capacitor.

Abstract: In a liquid-cooled semiconductor unit having one or more semiconductor modules and a plurality of cooling tubes arrayed in parallel, with each semiconductor module sandwiched between a pair of cooling tubes, a coolant supply header for supplying a flow of liquid coolant through respective flow passages in the cooling tubes and a coolant discharge header for discharging the liquid coolant from these coolant flow passages, each of the cooling tubes is disposed with an outlet end aperture portion thereof located at a higher elevation than an intake end aperture portion thereof.

Abstract: A movable magnet support tube and a stationary magnet support tube are aligned coaxially within a brake drum coupled to a rotational shaft. An array of magnets are supported at equal intervals on the outer surfaces of the magnet support tubes and proximal surfaces of ferromagnetic pole pieces are fixed to magnetic pole surfaces at ends of the magnets which are aligned annularly. Extreme end surfaces of the ferromagnetic members are juxtaposed to an inner peripheral surface of the brake drum and an actuator reversibly rotates the movable magnet support tube.

Abstract: A guide tube formed of a non-magnetically permeable material is coaxially disposed in a brake drum coupled to a rotational shaft and a magnet support tube formed of a non-magnetically permeable material is axially movably supported within the guide tube. A plurality of magnets are supported at equal annular intervals on the outer wall of the magnet support tube and proximal surfaces of ferromagnetic members are coupled to magnetic pole surfaces at opposite ends of the magnet. Actuators reciprocate the magnet support tube between a braking position in which extreme end surfaces of the ferromagnetic members are opposed to an inner surface of the brake drum and a non-braking position in which the ferromagnetic members are withdrawn from the brake drum.