Abstract: The present invention relates to an end shield (10) for a rotary electric machine, including one or more feed channels (12) for feeding a coolant supplied from a channel formed in a rotor lamination stack (8) or in a shaft of the rotor (1) or between the rotor lamination stack and the shaft, wherein at least one feed channel (12) includes a cross-sectional constriction (15), the cross-section of the feed channel decreasing and then increasing in a radial direction relative to the rotational axis (X) of the machine.

Abstract: The present invention relates to an end shield (10) for a rotary electric machine, including one or more feed channels (12) for feeding a coolant supplied from a channel formed in a rotor lamination stack (8) or in a shaft of the rotor or between the rotor lamination stack and the shaft, wherein at least one feed channel (12) has a spray portion (18) for spraying the coolant, said spray portion (18) being placed in the last two thirds of the feed channel (12), when considered in the direction in which the coolant circulates.

Abstract: The present invention relates to a voltage step-up circuit (100). One particularly advantageous application of the invention is in the field of 12 V/42 V DC/DC power convertors supplied by the power system onboard a motor vehicle (12 V battery voltage). The circuit (100) according to the invention comprises a voltage source (S) having a first terminal (+BAT) and a second terminal, at least one inductor (Lb), the first terminal of which is connected to the first terminal (+BAT) of the voltage source (S), at least one diode (Db), the anode of which is connected to the second terminal of the inductor (Lb), at least one capacitor (Cb), the first terminal of which is connected to the cathode of the diode (Db), at least one current switch (Mb) connected between the second terminal of the inductor (Lb) and the second terminal of the voltage source (S), and a second current switch (M) connected between the second terminal of the capacitor (Cb) and the second terminal of the voltage source (S).