Minebea Company, Limited

Presicion Motors Deutsche Minebea Gmbh

Oswald Kuwert

Juergen Oelsch

Kenji Fukunaga

Jurgen Oelsch

Hans-Joachim Wysk

Joachim Heizmann

Helmut Ganter

Uwe Moench

Harald Rapp

If the motor housingis manufactured with a resin, the housingbecomes possible to be manufactured by injection molding, so that the housingcan be intended to lower the manufacturing cost by a mass production. Further, the counter measures for insulation such as covering a copper wirewith an insulating tape, interposing an insulator to an openingof the housing installing an insulating shim between the coiland the housingbecome unnecessary. As a result, it becomes possible to expect a cost down of the spindle motor due to the reduction of the cost of the parts for insulating members and the mounting processes. And, further, since a vibration transmitted from the rotorthrough the bearing and a vibration caused by an electric switching of the statoretc. are diminished due to elastic absorbing function of the housing, rotation noise of the spindle motor can be reduced.

Spindle motor for disk driving device

The invention relates to a brushless electric motor comprising a stator, which has pole elements, and a rotor, which is mounted rotatably in relation to the stator and comprises magnet poles of magnetic powder material bonded to form a body and a back yoke body carrying the magnet poles, the magnet poles being formed by at least one molded magnetic body, which is molded with a back yoke side onto the back yoke body.

Electric motor and method for producing a rotor for such an electric motor

In order in the case of an electric motor, in particular a brushless electric motor, comprising a rotor, a stator, a motor housing receiving the rotor and the stator, a first bearing, disposed on the motor housing, and a second bearing, disposed opposite the first bearing, to allow the bearings to be positioned with the necessary precision when the rotor is being fitted into the motor housing, it is proposed that the motor housing comprises a housing body, which receives the stator, and a flange body, which receives the second bearing and can be mounted on the housing body, and that the flange body, when it is in an axial end position in relation to the rotor axis, is guided on the housing body against a movement transversely to the rotor axis and is fixed in relation to the housing body against a movement in the direction of the rotor axis by means of first positively connecting features, provided on the flange body, and second positively connecting features, provided on the housing body, which features can be brought into operative connection with one another by a relative movement of the flange body and housing body.

Electric motor

A rotor assembly for an electric motor having a rotor shaft and at least one permanent magnet arranged on the rotor shaft. The rotor shaft with the permanent magnet is accommodated in a sleeve the rotor shaft being freely rotatable within the sleeve. The sleeve is closed off by a flange at a first end face. An inner-rotor electric motor having a stator and a rotor assembly of the type described above, with the stator being inserted over the sleeve of the rotor assembly.

Rotor unit for an electromotor and an internal rotor electromotor

The invention relates to a relay supporting unit for an electric motor to arrange a number of relays at the end of the electric motor, at which winding connections and signal lines of the electric motor are provided. The relays are used to connect and interrupt the power supply to the motor windings. The relay supporting unit according to the invention features a supporting component which is designed in such a way that it extends over the end of the electric motor and has at least one, preferably several, chambers to accommodate and position the relays. A connecting frame is integrated into the supporting component to electrically connect the winding connections and the relays. Furthermore, a sensor PCB is also preferably integrated to which the signal lines of the electric motor can be connected. With the relay supporting unit according to the invention, it is possible to pre-assemble high-voltage bearing electronic components to control the motor winding of the electric motor as well as low-voltage bearing electronic components to record the signals of the electric motor in one single component.

Relay support device for an electric motor, in particular for an electrically commutated DC motor

If the motor housing is manufactured with a resin, the housing becomes possible to be manufactured by injection molding, so that the housing can be intended to lower the manufacturing cost by a mass production. Further, the counter measures for insulation such as covering a copper wire with an insulating tape, interposing an insulator to an opening of the housing installing an insulating shim between the coil and the housing become unnecessary. As a result, it becomes possible to expect a cost down of the spindle motor due to the reduction of the cost of the parts for insulating members and the mounting processes. And, further, since a vibration transmitted from the rotor through the bearing and a vibration caused by an electric switching of the stator etc. are diminished due to elastic absorbing function of the housing , rotation noise of the spindle motor can be reduced.

The invention concerns a spindle motor, comprising a stationary base flange that supports a central spindle, a hub that is positioned pivoting on the spindle with the aid of suitable bearings and on which at least on fixed-memory disc is arranged, wherein the hub has a rotor magnet on the inside circumference, and comprising a stator-side winding packet, which is arranged at the base flange and is positioned opposite the rotor magnet, wherein the winding packet is extrusion-coated completely with an elastic mass and is thereby connected to the base flange.

Growing community of inventors

Tutschfelden, Germany

Oswald Kuwert