Abstract: A shaped metallic element (1) for making laminations (100) of a stator (200) and/or a rotor (300) of a rotary electric machine (400) or for making the laminated ferromagnetic core (500) of a static electric machine, including two sides (2, 3) suited to be fixedly joined to corresponding sides (2, 3) of two shaped metallic elements (1) arranged so that they are adjacent to said shaped metallic element (1). In the shaped metallic element (1) the two sides (2, 3) have a shaped profile (4) matching the shaped profile of the sides (2, 3) of the adjacent shaped metallic elements (1) so that the shaped metallic elements (1) can be fixedly coupled with each other through interference.

Abstract: The windings of the electromotor at the starting are connected to the main power through starting resistors for a very short period of time, before being directly connected to the main power source.A voltage is initially established at the terminals of a voltage control resistor provided by at least one of the starting resistors, or a fraction thereof, before the running of the motor will occur and the direct connection of the motor windings to the main power is allowed only when the voltage across the voltage control resistor has decreased with respect to the voltage initially established at the starting of the motor. The temperature difference between the voltage control resistor, or a fraction thereof, and the ambient is also sensed and any new start of the motor will be prevented till the temperature of the control resistor is not adequately decreased.

Abstract: A refrigerating system in which a refrigeration fluid medium is flowing in a closed circuit comprising a compressor, a condenser, a receiver for containing the refrigeration fluid in a liquid state, and an evaporator serially connected between the outlet side and the intake side of the compressor; the improvement consisting in a cooling device for the compressor, comprising an auxiliary flow path for circulation of the refrigeration fluid, branched-off between the fluid receiver and the intake-side of the compressor and provided with a flow restrictor. Pressure sensing elements are provided on the intake side to provide a control signal in the absence of liquefied fluid in the receiver.

Abstract: A module for providing a work area in which one or several people can perform tasks requiring ultra-high efficiency air filtration. The work area is bounded above by a filter module through which a vertical laminar flow of air occurs from one or more HEPA filters. From the perimeter of the module flows a curtain of air in an enclosing and substantially parallel relationship to the laminar flow air to extend the laminar air zone to the floor. The air curtain also passes through a HEPA filter prior to discharge. The angular direction of the air curtain is adjustably controlled by a unique nozzle structure so that when the air curtain contacts the floor turbulence is substantially eliminated and a sweeping action away from the work area is effected. Separate blower systems supply air for the laminar flow air and the enclosing air curtain at differential velocities.