An injection moulded bobbin (1') for an electromagnet of an electromagnetic clutch (400) used for a refrigerant compressor (500) for an automotive air conditioning system includes a cylinder (2') and two flanges (3',4'), each extending radially outward from the an end of the cylinder (2'). The two flanges (3',4') have several deep excisions (31,31',31",41,41',41") at locations equidistant from an adjacent pair of injection gate receiving points. The excisions (31,41) extend from outer fringes of the flanges (31,41) inward direction almost reaching to the outer edge of the cylinder (21). A plurality of shallow excisions (30,40) also are provided along the outer edge of the flanges (3',4') to enable the resin (160) to spread in a laminar flow during the potting process of the core assembly (100) which is composed of the core (150) and coil assembly (101).

An electromagnetic coil assembly for an electromagnetic device comprises a bobbin, a multiple turn winding of electrical wire supported on a flange of the bobbin and a thermal protection device including a pair of lead wires extending from both sides thereof. The first lead wire is connected to one end of the multiple turn winding by a first joining member. The second lead wire is connected to an electric circuit by a second joining member. A connecting device, disposed on an outboard surface of one of the flanges of the bobbin, receives the thermal protection device, the first joining member and the second joining member.

An electromagnetic coil assembly for an electromagnetic device comprises a bobbin, a multiple turn winding of electrical wire supported on a flange of the bobbin and a thermal protection device including a pair of lead wires extending from both sides thereof. The first lead wire is connected to one end of the multiple turn winding by a first joining member. The second lead wire is connected to an electric circuit by a second joining member. A connecting device, disposed on an outboard surface of one of the flanges of the bobbin, receives the thermal protection device, the first joining member and the second joining member.

A yoke includes an annular groove in which an exciting coil is stored, and a first through hole formed in the bottom of the annular groove. A terminal housing includes a boss portion fitted in the first through hole and a connecting concave portion located on the opposite side of the annular groove with respect to the boss portion. The boss portion includes a second through hole extending in a direction parallel to the center line of the first through hole. An external connecting terminal is buried in the terminal housing. The external includes a coil extraction hole continuing to the second through hole. The extraction end of the exciting coil is soldered to the terminal in a state in which the extraction end is passed through the second through hole and the coil extraction hole.

The present invention relates to an electromagnetic coupling device. In the electromagnetic coupling device according to the present invention, ends (5a and 5b) of a winding of an electromagnetic coil (5) are fitted to grooves of a terminal casing, and terminal members (19a and 19b) are press-fitted to a groove crossing the abovementioned groove, so that lead wires (18a and 18b) held by the terminal members (19a and 19b) are electrically connected to the ends (5a and 5b) of the winding. Terminal lines (51a and 51b) made of enameled copper wires are connected to the opposite ends of the winding of the electromagnetic coil (5) made of an aluminum wire, and the terminal lines (51a and 51b) handled as the ends (5a and 5b) of the winding are connected to brass-made connection pieces (29a and 29b) of the terminal members (19a and 19b).

The invention relates to a motive power device for a vehicle, comprising:

two electric motors (M1;M2) with a support configured to support the two electric motors, each motor (M1;M2) driving a wheel mount and a clutch (EMC) connected between the two motors (M1;M2) to drive torque between them. The motors may be supported inside the vehicle and connected to the wheel mounts using drive shafts (S1,S2).

The present invention relates to an electromagnetic actuator which reduces power consumption at the time of continuous operation with maintaining controllability. The electromagnetic actuator includes therein a permanent magnet (4) and a switching electromagnet coil (6) which switches a route along which this magnetic flux passes, and is constructed so that, in the case of performing the continuous operation, the magnetic flux of the permanent magnet (4) may pass along a route, which includes an armature (3), by exciting the switching electromagnet coil (6).

An electromagnetic actuator includes a supporting member (13,33,213) supporting an electromagnetic coil (15, 35) around which a wire is wound, a moving member (14, 34, 214) positioned facing the supporting member so as to move forward and backward, and an actuating force transmitting member (16, 36, 216) transmitting moving force of the moving member to a member to be actuated (10b, 30b) as an actuating force. The moving member is moved towards the supporting member by magnetic force generated by applying an electric current to the electromagnetic coil to apply the actuating force to the member to be actuated via the actuating force transmitting member. The electromagnetic coil includes a plurality of electromagnetic coils provided at the supporting member.

Device (1) for transmitting movement toa fan (2) cooling the cooling liquid in a motor vehicle, comprising a fixed shaft (3) supporting the device and a single rotational actuating group (5,5a), characterized in that it comprises an electromagnetic clutch (10) with a double body (11, 12) which can be coupled to a gearing (20) of the epicyclic type with a sun gear (23) integral with said fixed shaft (3).