Abstract: A motor for a cooling fan of a vehicle has a rotor including a driving shaft mounted so as to be rotatable in a stator and a bowl-shaped metal case, having a lateral skirt wall which extends around the stator, and having a bottom wall in which there is constructed a tubular fixing formation through which the shaft extends and which is fixed to the shaft. The tubular fixing formation of the rotor case has an internal diameter which is greater than the diameter of the driving shaft. The motor further has an intermediate insert including a tubular portion which is fixed to the shaft and on which there is fixed the tubular formation of the rotor case, and a transverse connecting portion which extends adjacent to the external surface of the bottom wall of the rotor case, and which is connected or connectable to the impeller.

Abstract: A fan unit for a heat exchanger, has a plate-like support structure or shroud with a main opening defining an air passage for ventilation of the heat exchanger. An electric drive motor is fixed to the support structure or shroud. An impeller is arranged inside the main opening and driven by the drive motor. A spray protection screen associated with a side of the motor remote from the impeller is fixed to the support structure or shroud in such a way that, during use, it is substantially vertical and defines an inlet opening for an air flow for cooling the motor. The spray protection screen has an outwardly projecting deviating formation designed to deflect outside of the inlet opening, water which may flow over the outer surface of the screen during operation of the fan unit.

Abstract: A direct current motor has a wound stator, a permanent magnet rotor having a commutator assembly, and brush gear. The brush gear has a first pole brush, a second pole brush and a plurality of commutating brushes. The commutator assembly has a cylindrical insulating base, and first and second members fixed to the base. The first member includes a radially extending first slip ring and a number of axially extending first bars. The second member includes a radially extending second slip ring and a number of axially extending second bars. The first and second pole brushes make continuous sliding contact with the first and second slip rings respectively. The first and second bars are fixed to the outer cylindrical surface of the base and form a cylindrical surface against which the commutating brushes make sliding contact.

Abstract: A permanent magnet rotor includes a shaft, a rotor core fixed to the shaft, and multiple magnet sets. The rotor core has multiple groove sets for receiving the magnet sets. Each groove set has two grooves spaced apart by a first section of the rotor core. The first section has a width gradually decreasing from a radially inner end to a radially outer end. Each groove has a width gradually increasing from a radially inner end to a radially outer end. Each magnet set includes two magnets respectively received in the grooves of a respective groove set. The magnets of a magnet set are magnetized in a same direction, and every two adjacent magnet sets are magnetized in contrary directions creating multiple magnetic poles. The number of magnetic poles is equal to the number of magnet sets.

Abstract: A brush motor includes a stator and a rotor. The stator includes multiple magnets attached to an inner surface of a stator housing and a brush assembly fixed relative to the housing. The rotor includes a rotor core and a commutator located in a receiving space defined by a mounting portion and an annular sidewall of the rotor core. The commutator includes multiple conductive segments, each of which has a leg penetrating the rotor core and connected with windings on the rotor core.

Abstract: An electric D.C. motor, in particular for a cooling fan of a vehicle, has a brush holder. The brush holder has a carrier structure having a plurality of brush cages mounted therein. Brushes, radially displaceable within the brush cages are connected, respectively, to a positive supply terminal and a negative supply terminal. An electric supply connector and a filter for preventing the emission of electromagnetic interference, are associated with the brush holder. Components of the filter, including first and second inductors and at least one capacitor are housed inside the electric supply connector.

Abstract: An electric motor has a wound stator and a permanent magnet rotor. The rotor has a plurality of rotor core portions and a plurality of permanent magnets, the rotor core portions and the permanent magnets being arranged alternately in a circumferential direction of the rotor. The permanent magnets are made of material containing ferric oxide and polarized generally in the circumferential direction of the rotor. The motor may be used in a power tool or a lawn mower.

Abstract: An axial fan has a hub whose axis coincides with the rotational axis of the fan, a plurality of vanes that extend from the hub, and an outer ring which is coaxial with the hub. The ring has a front portion and a rear portion. The outer ring defines within itself a passage towards the rear portion. The radially outermost ends of the vanes are connected to the inner surface of the passage. The rear portion of the ring has a plurality of appendages that extend axially away from the front portion of the ring, and which alternate circumferentially with corresponding intermediate recesses. Each vane has its radially outermost end connected to an inner surface of one of the appendages.

Abstract: A heating pump includes a motor, a housing fixed to the motor, an impeller driven by the motor and received in the housing, and a tubular heating member fixed in the housing. The housing includes an intake tube and a discharge port arranged at the periphery of the intake tube. The impeller includes an inlet communicating with the intake tube and a plurality of outlets around the inlet. The outlets communicate with the discharge port via a first passage surrounded by the heating member. A second passage, which communicates with the first passage, is formed between a radially outer surface of the heating member and a radially inner surface of the housing.

Abstract: A torque transmission assembly has a first shaft, a second shaft, and a coupling device. The coupling device includes a first coupling member rotating with the first shaft, and a second coupling member fixed with the second shaft. The first coupling member includes a bottom wall having a mounting face, and a plurality of arms extending axially from the mounting face. The arms are circumferentially spaced from each other with a receiving space defined between each two neighboring arms. The second coupling member includes a main body and a plurality of spaced arms extending radially from an outer periphery of the main body. Each of the arms of the second coupling member is received in a respective receiving space of the first coupling member, thus the first coupling member rotates with the second coupling member.

Abstract: A control circuit for an electric fan, has a MOSFET transistor connected essentially in series with the motor of an electric fan between the two terminals of a first D.C. voltage source and having its source terminal connected to the motor; a transistor driving stage, having an input intended to receive a pulse-width modulation control signal and an output connected to the gate terminal of the MOSFET transistor, and a bootstrap capacitor connected between a second D.C. voltage source and the source terminal of the MOSFET transistor. A controlled electronic switch having a parallel-connected diode for conducting current from the bootstrap capacitor to the motor is arranged between the bootstrap capacitor and the source terminal of the MOSFET transistor. The electronic switch has a control input or gate connected to the output of the transistor driving stage.

Abstract: A food processor has a container, a working piece for processing food material in the container, and a motor assembly for driving the working piece. The motor assembly includes an electric motor and a speed reduction gear unit connected between the motor and the working piece. The speed reduction gear unit includes a damper for isolating the motor from vibrations from the working piece.

Abstract: A solenoid includes a stationary member, a movable member being movable relative to the stationary member and spring disposed between the stationary member and the movable member. The stationary member includes a housing with an end wall and a side wall, a first permanent magnet attached to the end wall, a second permanent magnet attached to the side wall and a magnetic flux concentrator configured to concentrate a magnetic field generated by the second permanent magnet with a magnetic field generated by the first permanent magnet. The movable member includes a head inserted into the housing. The head is made of magnetically conductive material. The stationary member further includes a coil surrounding the head of the movable member. When the coil receives a pulse current, the movable member is driven from an extended/retracted position to a retracted/extended position.

Abstract: A stator core includes at least one bendable strip-shaped core. Each strip-shaped core is formed by stacking a plurality of laminations. Each lamination includes at least two yoke portions and at least two tooth portions. Every two adjacent yoke portions are connected to each other via a bendable portion and have two opposite end surfaces, one of the end surfaces having a groove and the other having a projecting rib. After the bendable portion is bent the projecting rib is engaged in the groove to form an interlock structure such that relative circumferential movement between the adjacent yoke portions is limited.