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| Number | Title | Issue Date |
| 6232690 | Electronically commutated DC A DC motor has a housing having an air gap and a stator coil is positioned in the air gap. First and second permanent magnet rotors are coaxially arranged to one another in the housing on opposite sides of the air gap. The first and second permanent magne... | 05/15/2001 |
| 6097129 | Electronically commutated motor An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior st... | 08/01/2000 |
| 6051944 | Drive-circuit of a brushless DC motor Drive circuit for a brushless, electronically commutated DC motor, wherein an electronic switching element (T1, T2) is arranged in series with each phase winding (L1, L2) of the motor and the switching elements ... | 04/18/2000 |
| 6017191 | Axial ventilator housing This invention relates to an axial fan housing having a metallic shielding grating covering an air passage opening, wherein the grating is formed with a series of vane-like guide bars arranged in two or more concentric circular series. The number of guide... | 01/25/2000 |
| 6013966 | Mini-fan unit especially for use as a fun printed circuit boards A mini-fan unit for cooling a printed circuit board has a collectorless dc motor and a fan wheel driven by the dc motor. The dc motor is a single phase, single core claw pole motor having a back iron free permanent magnet rotor. At least one positioning m... | 01/11/2000 |
| 5600216 | Bridge circuit for driving a brushless DC motor The invention pertains to a bridge circuit and a drive circuit for it, in particular for driving a brushless DC motor. The bridge circuit exclusively consists of n-channel field-effect transistors. An auxiliary potential generated by at least one potentia... | 02/04/1997 |
| 5135363 | Miniaturized direct current fan An axial flow fan for ventilating electrical and electronic equipment includes a brushless, DC external rotor-type central drive motor. The stator is supported by a bearing tube formed of plastic, integrally molded with a mounting flange. In one embodimen... | 08/04/1992 |
| 5040085 | Disk storage drive directed to disk drive details A disk storage drive is provided with a brushless drive motor having a stator with a winding. An external rotor coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. The rotor includes a permanent magnet and a soft... | 08/13/1991 |
| 4924156 | Driver circuit for a D.C. motor without commutator A method is disclosed for the low-loss regulation of a d.c. motor without commutator and of a semiconductor circuit in which, during a commutation phase at reduced motor power or rpm as given by a position indicator, the end transistors or one end transis... | 05/08/1990 |
