| Patent Number |
Title Of Patent |
Date Issued |
| RE34412 |
Disk storage drive having motor drive with non-corrodible hub |
October 19, 1993 |
| 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 magnetic yoke. A hub is provided |
| RE34268 |
Brushless direct current motor system |
June 1, 1993 |
| The invention relates to a brushless direct current motor system that includes an outer rotor receiving a load member such as a fan wheel having a plurality of blades. An axial extension of the rotor functions as a drive boss whose diameter is independent of the diameter of the motor |
| RE34001 |
Enamelled wire connection for circuit boards |
July 21, 1992 |
| Disclosed is an arrangement for providing an electrical connection to the enamelled wire of a coil of an electrical motor. The arrangement includes a circuit board carrying at least one conductive component such as an electrical trace on the surface of the circuit board. A conductive |
| RE33813 |
Electric motor, particularly a brushless direct current motor |
February 4, 1992 |
| Electric motor with a substantially cylindrical air gap between the stator and the rotor, the stator being fitted to a bearing support for the rotor shaft bearing. In order to reduce noise emissions, the stator is connected to the bearing support by means of an elastic damper and the sta |
| RE33167 |
Circuit arrangement for monitoring speed of a drive motor |
February 20, 1990 |
| A circuit for speed monitoring, particularly for fan drives. A detection device for producing an input signal sequence is provided which has a speed-dependent repetition frequency. The circuit also has a signal converter for converting the input signal sequence into an output signal |
| RE32702 |
Brushless D.C. motor assembly |
June 21, 1988 |
| An improved motor assembly including a brushless D.C. motor and an annular member defining a platform for the drive electronics and speed control circuits of the motor. The member is carried on a fixed support within the outer envelope of the motor and includes a thin disk-like body prov |
| RE31278 |
Brushless D-C motor |
June 14, 1983 |
| A preferably axial air gap motor has coreless armature stator windings and a permanent magnet rotor. Sensors, such as Hall generators, are provided to sense the rotary position of the rotor and control switching of current to the respective armature windings. The stator armature windings |
| 6831431 |
Method for regulating the rotational speed of a motor and a motor for carrying out a method of t |
December 14, 2004 |
| The invention concerns a method for regulating the rotation speed, of a motor with which a digital rotation speed controller is associated and which, during operation, furnishes an actual-value signal for the rotation speed in the form of a rotation speed frequency signal, toward a targe |
| 6759820 |
Arrangement for supplying a user, especially a D.C motor, that consumes power in a non-continuou |
July 6, 2004 |
| The invention concerns an arrangement for powering a load (12) that has non-continuous power consumption from a DC power supply (UB). The arrangement has a DC link circuit (14, 22) to which said load (12) can be connected and with which is associated a capacitor (21) that is suitable |
| 6659719 |
Ventilator housing, in particular, for axial ventilators |
December 9, 2003 |
| A ventilator housing of a ventilator has a flow passage having an intake opening and an outlet opening. Outflow contouring devices are arranged about the outlet opening and are configured to at least reduce a vortex formation within a shearing layer that is generated during operation of |
| 6551059 |
Radial blower, in particular, for a breathing apparatus |
April 22, 2003 |
| A radial blower, in particular, for a breathing apparatus, has a blower housing with a central, axial intake opening and a radial or approximately tangential outlet opening as well as a motor-driven radial blower wheel arranged axially between the intake opening and the outlet opening. T |
| 6545381 |
Small electric motor with axial bearing |
April 8, 2003 |
| A small electric motor has a rotor with a permanent magnet and a shaft having a first end provided with a depression. Axial and radial bearings support the shaft. A bushing receives the first end of the shaft. The axial bearing has a non-magnetic ball positioned in the depression. A side |
| 6507135 |
Axial ventilator with external-rotor drive motor |
January 14, 2003 |
| An axial ventilator has an external-rotor drive motor having an external rotor with a rotor shaft and an internal stator, wherein the external rotor rotates about the internal stator during operation of the external-rotor drive motor. A ventilator wheel driven by the external rotor i |
| 6501200 |
Motor arrangement |
December 31, 2002 |
| A motor arrangement has an electronically commutated motor of an explosion-protected design with a permanent-magnetic rotor, a stator, and an electronic commutation device. At least one galvanomagnetic rotor position sensor is arranged on the stator and separated from the permanent-m |
| 6496786 |
Method and apparatus for measuring a frequency datum |
December 17, 2002 |
| An improved method, for obtaining a datum concerning the rotation speed (n) of a rotating object, such as a motor rotor (32), offers high precision. Typically, the motor has a sensor (61) which supplies a sensor signal that has, for each revolution of the rotor, a plurality A of events s |
| 6496340 |
Arrangement with an electric motor |
December 17, 2002 |
| The rotation speed of an electric motor (9) is controlled by a controller (6) which receives its setpoint from a characteristic function (23). The characteristic function (23) calculates a setpoint for the controller (6) on the basis of an originally analog variable A (2) that is convert |
| 6463546 |
Method and apparatus for monitoring a microprocessor |
October 8, 2002 |
| A watchdog circuit for a microprocessor which has a reset input and a control output, which output, when operation is normal, periodically delivers, under program control, a signal (P0B2) of predefined duration (t.sub.1); and having a capacitor (32) that can be charged via a charging |
| 6456024 |
Electronically commutated DC motor |
September 24, 2002 |
| An electronically commutated direct-current motor has a permanent-magnet rotor (19), a stator (2) that has at least one drive winding (25), and an H-bridge circuit (52) in which two bridge elements are configured as transistors (54, 56) and the other two bridge elements as resistors (58, |
| 6452349 |
Electronically commutated motor |
September 17, 2002 |
| In an electronically commutated motor, both the driving current (i.sub.2) and the braking current (i.sub.2 ') are monitored. When excessive driving current occurs, a pulse duty factor which regulates the current is reduced. When excessive braking current occurs, this pulse duty factor is |
| 6448726 |
Electronically commutated motor |
September 10, 2002 |
| An electronically commutated motor has a rotor and a stator interacting with one another. A semiconductor control member controls a motor current supplied to the stator. An arrangement is provided that detects values of the motor current which surpass a preset threshold value and generat |
| 6429615 |
Electronically commutated DC motor |
August 6, 2002 |
| An electronically commutated motor (4) has a permanent-magnet rotor (28) and has a stator (14) that has two winding phases (25, 26). During one rotor rotation of 360.degree. el., firstly current is delivered to the one winding phase (25) within a first rotation angle range via an associa |
| 6396226 |
Electronically commutated DC motor |
May 28, 2002 |
| An electronically commutated motor (4) has a stator (14) with two winding phases (25, 26) which are alternatingly supplied with current during one rotor rotation through 360.degree. cl. The motor also has a permanent-magnet rotor (28) which, when the motor (4) is currentless, assumes |
| 6307338 |
Electronically commutated motor |
October 23, 2001 |
| An electronically commutated motor has at least two winding phases (112, 114) which are wound together or otherwise inductively coupled. Current in each phase is controlled by a respective power transistor (124, 128). An integrated circuit controller (146) receives signals from a Hall se |
| 6281616 |
Claw pole motor |
August 28, 2001 |
| An electronically commutated claw pole motor has an external rotor (42) with a shaft (40) and a rotor magnet (62). The claw pole motor contains a stator (64) which has a first soft ferromagnetic stator pole piece (74) located on its side facing away from the external rotor (42). The stat |
| 6169378 |
Electronically commutated motor with galvanically separate user interface circuit |
January 2, 2001 |
| The arrangement has a motor (16) which has an electronic commutator and during operation is supplied from alternating current (AC) mains (L, N) via a rectifier (52) connected thereto, and a direct current (DC) link (22, 58) connected to said rectifier (52) and having a DC voltage (U. |
| 6163117 |
Electronically commutated motor and method of controlling such a motor |
December 19, 2000 |
| The present invention relates to a method of operating a three-or more-stranded electronically commutated motor which, to detect its rotor position, has a number of sensors which is fewer, by at least one, than the number of sensors intrinsically necessary for this number of strands |
| 6091887 |
Method and apparatus for controlling a physical parameter |
July 18, 2000 |
| The invention relates to a method for adjusting a real value (actual value) of a physical quantity to a preset value (target value) with the following steps:(a) the difference between the target value and the actual value (referred to below as the control deviation) and its sign (referre |
| 6078152 |
Bidirectional E.C. motor and method of operating the motor |
June 20, 2000 |
| In a method of starting a two-pulse electronically commutated dc motor, which is designed for operation in a preferred direction, for purposes of startup in a desired direction, the following steps are carried out: after start-up, the rotor of the motor is driven, according to a start ro |
| 6008602 |
Arrangement with an electronically commutated motor |
December 28, 1999 |
| An arrangement with a electronically commutated motor (10) with a permanent-magnet rotor (14) is supplied with DC power from an AC supply (28, 30) via a rectifier (44) connected thereto and a DC link (46,52) connected to said rectifier (44). It has an arrangement (60, 64, 66, 68, 70) |
| 5973424 |
Process for insulating the stator of an electronically switched D.C. motor |
October 26, 1999 |
| The present invention is directed to a method of insulating the stator of an electronically commutated direct current motor, in order to also fulfill high insulation and protection requirements. This method comprises the following steps:the stator (1) is introduced into a closable form w |
| 5963024 |
Switched mode power supply |
October 5, 1999 |
| The present invention concerns a switched mode power supply with a timed switching regulator (1), whereby an electronic switching component (T.sub.1) is periodically switched on and off in such a particular pulse duty ratio, that an output control voltage (U.sub.B) is produced from a |
| 5933573 |
Method of controlling an electric motor and apparatus for carrying out the method |
August 3, 1999 |
| An electric motor (12) is supplied with current (i.sub.mot) via a semiconductor switch (14). During operation, the semiconductor switch (14) is driven by a Pulse Width Modulation (PWM) unit 15 using a pulse-formed signal (32). For regulation of the duty ratio of this pulse-formed signal, |
| 5847523 |
Method of limiting current in a DC motor and DC motor system for implementing said method |
December 8, 1998 |
| The invention relates to a method of current limitation in a direct current motor, with the following steps: in successive cycles, the motor is turned on at a predetermined place in the cycle and, after lapse of a predetermined time interval, the motor current is tested in a first test |
| 5845045 |
Method and apparatus for DC motor speed control |
December 1, 1998 |
| A memory device, e.g. a capacitor, is provided for a collectorless DC motor. This component is charged whenever a particular rotor position is reached. In so doing, a voltage value or quantity on this memory device is changed. This quantity is compared to another quantity, which is depen |
| 5831359 |
Electronically commutated motor with external rotor |
November 3, 1998 |
| An electronically commutated motor (10) has a permanent-magnet external rotor (58) and an inner stator (20) with claw-poles (30,32; 44,46). Preferably, the claw-poles extend axially from opposite directions along the outside of the stator (20) and are interdigited. A galvanomagnetic |
| 5757100 |
Method & apparatus for reducing cogging torque in an electric motor |
May 26, 1998 |
| Certain permanent-magnet-rotor electric motors exhibit an irregularity in their torque which is known as "cogging." The present invention creates at least one supplemental reluctance torque, and superimposes this supplemental reluctance torque on the cogging torque, in order to reduce |
| 5731674 |
Motor with variable edge steepness |
March 24, 1998 |
| An improved motor for driving a variable-speed fan used, for example, to prevent overheating of electronic equipment, features an electronic controller which sends current pulses through the stator winding(s) of the motor, and varies the slope of trailing edges of these pulses in acc |
| 5695318 |
Diagonal fan |
December 9, 1997 |
| This invention relates to a diagonal fan with a truncated cone shaped hub (4a) of the fan wheel (4) and a truncated cone shaped air housing (2). The angle of the truncated cone of the hub (4a) and of the truncated cone of the air housing (2) are relatively small, the outlet cross section |
| 5678988 |
Blower for gas premix burners |
October 21, 1997 |
| A gas premix burner in which gas and air are mixed in a suction region of an impeller to form a combustion mixture. The impeller is associated with a blower housing and an electronic control circuit board, all of which are arranged upstream in a blower chamber having at least one time se |
| 5652825 |
Power supply for low-voltage DC motor |
July 29, 1997 |
| An improved power supply for converting any of various standard national AC network voltages to low-voltage DC power suitable for driving a 1 or 2-watt device, such as a fan, features a semiconductor control circuit (18, FET 46) which chops each half-wave of a rectified voltage and uses |
| 5591008 |
Fan impellers |
January 7, 1997 |
| An impeller for a fan comprising a hub for rotation by a drive rotor and a plurality of fan blades for rotation with the hub, the impeller further comprising a support or guide member supporting or connecting fan blades of said plurality, and wherein one or more pockets are provided in s |
| 5590235 |
DC motor control with periodic reset |
December 31, 1996 |
| An electric motor (10) particularly a low-voltage collectorless dc motor, has a microprocessor (18, 40) with a reset input (24). Further, it has a device (26) which, during the running of the motor, generates signals (R) which depend upon the rotational position of the rotor (14) of the |
| 5537015 |
Semiconductor circuit for a DC motor |
July 16, 1996 |
| It is an object of the invention to provide a transistorized full-bridge driving circuit for an electronically commutated collectorless dc motor, in which burnout of the pnp transistors from overvoltage is avoided. This is accomplished by an arrangement with a collectorless dc motor (19) |
| 5258672 |
Axial retaining means for the rotor shaft of an electric motor |
November 2, 1993 |
| Axial retaining ring is provided for a free end of a rotor shaft of an electric motor having a rotor, with a first stop element on one of the shaft or the rotor and a second stop element in the form of a retaining ring which, during assembly of the motor, is fitted onto the free end of |
| 5243242 |
In-hub motor |
September 7, 1993 |
| In order to reduce the cost of producing an in-hub motor, which consists of a hub and the motor which is located in this hub and which contains magnets, magnetic yokes, coils, and shieldings, the hub (2) made of magnetizable steel is coated at least on the outer surface (20) with a n |
| 5225746 |
Apparatus and method for controlling brushless electric motors |
July 6, 1993 |
| A brushless direct current motor is energized by a power stage. Switches of the power stage are selectively switched by an electronic control device. In order to determine the correct commutation pattern, without using rotor position indicators, the control device is arranged to tap the |
| 5220258 |
Drive circuit for a brushless direct-current motor |
June 15, 1993 |
| A drive circuit for a brushless direct-current motor, particularly a fan motor, which permits a flexible control or regulation of the power delivered to the direct-current motor depending on a desired or reference value. The drive circuit consists of power output stages which are sup |
| 5216557 |
Disk storage device having a brushless DC drive motor |
June 1, 1993 |
| 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 magnetic yoke. A hub is provided |
| 5204621 |
Position sensor employing a soft magnetic core |
April 20, 1993 |
| A position sensor using a soft magnetic core and a permanent magnet for detecting linear or rotary movements of a part. In one embodiment, a differential transformer is provided with corresponding windings 3, 4 and 5, which are wound on a tubular carrier member 2. Provided inside the |
| 5184938 |
Axial fan with a cylindrical outer housing |
February 9, 1993 |
| The invention relates to an axial fan with an essentially cylindrical outer housing and with a fan wheel which rotates therein and the hub of which is located on the rotor of an electric drive motor, the stator of the drive motor being held by webs extending on the delivery side relative |
