Spindle motor

• US 5,986,365 A
• Filed: 09/22/1997
• Issued: 11/16/1999
• Est. Priority Date: 09/22/1997
• Status: Expired due to Term

• Current Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Original Assignee: Presicion Motors Deutsche Minebea GmbH
• Inventors: Moench, Uwe, Kuwert, Oswald, Oelsch, Juergen
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Jones, Judson H.
• Application Number:
  US08/934,616
• Time in Patent Office: 785 Days
• Field of Search: 310/51, 310/13, 360/104, 360/105, 360/106, 360/99.04, 360/99.08, 360/98.07
• US Class Current: 310/51
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto

Abstract

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.

Claims

1. A spindle motor comprising:

a stationary base flange that supports a central spindle;

a hub that is positioned with suitable bearings such that it pivots on the spindle and on which at least one fixed-memory disc is arranged, wherein the hub has a rotor magnet on the inside circumference; and

a stator with stator winding, which is arranged opposite the rotor magnet on the base flange,

wherein the stator is completely extrusion-coated with an elastic material mass and is connected to the base flange by means of said extrusion-coating with an elastic material.

2. A spindle motor according to claim 1, wherein the elastic mass comprises a thermoplastic synthetic material.

3. A spindle motor according to claim 1, further comprising:

wires for connecting the stator with electrical contacts;

wherein said stationary base flange comprises a recess, said wires being fed through the recess; and

wherein said elastic mass with which said stator is extrusion-coated completely fills portions of the recess through which said wires are not fed.

5. A spindle motor according to claim 3, wherein the connector is joined rigidly to the base flange through the elastic mass.

4. A spindle motor comprising:

a stationary base flange that supports a central spindle;

a hub that is positioned with suitable bearings such that it pivots on the spindle and on which at least one fixed-memory disc is arranged, wherein the hub has a rotor magnet on the inside circumference; and

a stator with stator winding, which is arranged opposite the rotor magnet on the base flange, wherein the stator is completely extrusion-coated with an elastic material mass and is connected to the base flange by means of said extrusion-coating with an elastic material,

and wherein a connector is provided on the base flange, which has several terminal lugs for the electrical contacting of connecting wires for the stator winding.

6. A method for connecting a stator with a base flange of a spindle motor, comprising the steps of:

securing the stator in a respective mold;

inserting the base flange into the mold at the same time;

securing both structural components together through extrusion-coating or pouring material around them.