Showing papers by "ebm-papst published in 2000"

Method and apparatus for measuring a frequency datum

Abstract: 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 such as pulses or pulse edges which are counted by a microprocessor ( 23 ) associated with the motor. In order to keep the computation load on the microprocessor from increasing as the rotor speed increases, yet maintain high precision, the measurement is done over a full rotation of the rotor, starts at a first signal event ( 176 ), and ends after a third or nth signal event ( 182 ) which happens at the same rotational position as the first signal event.

Method for configuring the alarm device of an electrical motor and motor for implementing said method

Abstract: When a motor is defective, e.g. stops running, runs too slow or overheats, many clients demand that an alarm signal be generated, that is, an alarm device included in the motor. In order to configure said alarm signal, the following method is used: at least one parameter for the configuration of the alarm device of the motor is inputted by means of an input interface (80, 82); the at least one parameter is stored in a parameter storage (74; 109); the execution of at least one routine of the alarm device provided in the microprocessor (23) is influenced by said stored parameter or by parameters derived therefrom. The invention also relates to a motor for implementing said method. Said motor makes it possible to easily configure the alarm device according to the actual requirements of a client.

Arrangement for supplying a user, especially a d.c. motor, that consumes power in a non-continuous manner from a d.c. system

Abstract: The invention relates to an arrangement for supplying a user (12) that consumes power in a non-continuous manner from a d.c. system (UB). The arrangement comprises a d.c. link (14, 22). The user (12) can be connected to said link. A capacitor (21) that is suitable for supplying the user with energy for a short time is allocated to said link. The aim of the invention is to connect the d.c. link (14, 22) to the d.c. system (UB). A current controller (24, 30) is provided for supplying an essentially constant current (i) to the capacitor (21) and a user (12) being connected to said link. The desired value of said current controller (30) is adapted to the relevant current demand of the user (12) by means of a second controller (34). Such an arrangement can be called an active filter which is particularly suitable for electronically commutated motors and motors with PWM current control. The arrangement comprises an electronic security device (240) that, when being actuated, switches off the current controller (30), automatically switches the current controller (30) back on after a pre-determined period has elapsed and optionally repeats the switching-on attempts several times.

Stator for an inner rotor motor

Abstract: The stator has a stator plate packet with a stator yoke with an inner opening (5) for a rotor, and inwardly protruding pole teeth for stator windings. The pole teeth feet are force and shape-connected to the stator yoke. The rotor opening in the stator yoke has stamped grooves (4) and joint grooves distributed at its periphery corresponding to the number of pole teeth. The shape of the pole teeth feet is formed by stamping out the stamped grooves, and the feet are fixed into the joint grooves by force and shape-locking.

Method for operating an electric motor, and an electric motor for carrying out such a method

Abstract: The invention relates to a method for operating an electric motor (32) to which a microprocessor or microcontroller (23) and a non-volatile memory (74) are assigned, whereby, during the occurrence of a fault, at least one operation data value of the motor is automatically stored in the non-volatile memory (74) in a program-controlled manner. The invention also relates to an electric motor for carrying out such a method. The invention serves to increase the operational reliability of a motor since the stored data can be queried occasionally or after the occurrence of a fault. In addition, the invention demonstrates how such faults are processed.

Electrical motor with self-protection against overheating

Abstract: The self protection unit (1) has a sensor unit (2) for determining the temperature in the motor and the surrounding region. There is a regulating unit (4) connected with the sensor unit (2) and the control. The regulating unit (4) respectively compares at least one sensor signal as a temperature actual value (i1, i2, i3, i4) with a specified associated limit value (G1, G2, G3, G4).If the temperature exceeds the predetermined value, the supply to the motor winding is controlled. By alteration of the electric power or the motor speed, the temperature is regulated.

Operating method for electronic commutating electric motor, using microprocessor controller and non-transient memory to store normal operating motor parameter for comparison with monitored values during operation

Abstract: The operating method is carried out using a microcontroller (23) or a microprocessor and a non-transient memory (74) for controlling the electric motor (32). With the occurrence of a fault, at least one operating data value, such as the rotation speed of the electric motor, is automatically stored in the non-transient memory. Routinely important operating parameters can be monitored from time to time and the measured values are then processed and compared with stored values. Independent claims are included for an electric motor device.

Electric motor with rpm-monitor

Abstract: The motor comprises a speed transducer. A ring magnet (8) of the speed transducer (8, 9) plugs into an inner wall of the motor end plate (3).

Electronically commutated D.C. motor

Abstract: The stator (2) has at least one winding,. There is an H-bridge circuit (52) in which two bridge elements are transistors (54,56). The other two bridge elements are resistors (58,60). The operating winding (25) is arranged in the diagonals of the H bridge circuit (52). In addition a commutating circuit is provided for the alternating switching ON and OFF of the two transistors of the H Bridge circuit. A constant current element (77) is provided, which is connected series with the H bridge circuit (52).

Electrically commutated DC-motor

Abstract: The motor (4) comprises a stator with two winding cords (25, 26) which are supplied over respective semiconductor switch (56, 62) with current, and a permanent-magnetic rotor (28) which starts moving in a desired rotation direction at activation of a predetermined winding cord. A commutation arrangement comprises a bistable multivibrator (64), whose switch condition is controlled through voltages which are induced from the rotor into a currently deactivated winding cord. The bistable multivibrator has a reset condition (92) which it assumes when the motor is switched on, so that a power supply of a predetermined winding cord is caused at activation.

Verfahren zur Messung einer Frequenzinformation, insbesondere einer Drehzahlinformation bei einem Motors, und Vorrichtung zur Durchführung eines solchen Verfahrens

Abstract: Es geht um ein Verfahren zur Gewinnung einer Information uber die Drehzahl (n) eines rotierenden, im folgenden Rotor (32) genannten Objekts. Diesem Rotor ist ein Sensor zugeordnet, welcher ein Sensorsignal liefert, das pro Umdrehung des Rotors eine feste Zahl A von Ereignissen aufweist. Das Verfahren weist folgende Schritte auf: DOLLAR A a) Zu einem ersten Zeitpunkt wird die Messung einer Drehzahlinformation eingeleitet; DOLLAR A b) ein zweiter Zeitpunkt wird ermittelt, an dem ein dem ersten Zeitpunkt folgendes Ereignis des Sensorsignals auftritt; DOLLAR A c) die Zahl der folgenden Ereignisse des Sensorsignals wird erfasst; DOLLAR A d) an einem dritten, vorgegebenen Zeitpunkt wird die Beendigung der Messung der Drehzahlinformation eingeleitet; DOLLAR A e) ein vierter Zeitpunkt wird ermittelt, an dem, nach dem dritten, vorgegebenen Zeitpunkt, die Zahl der Ereignisse seit dem zweiten Zeitpunkt gleich a E A ist, DOLLAR A f) aus dem zeitlichen Abstand (DELTAt) zwischen zweitem Zeitpunkt und viertem Zeitpunkt sowie der bis zum vierten Zeitpunkt erfassten Zahl der Ereignisse wird eine Drehzahlinformation berechnet, DOLLAR A wobei a = 1, 2, 3, ..., und A = Zahl von Ereignissen pro voller Umdrehung des Rotors ist.

Arrangement for a vibration insulating support of an electric motor

Abstract: The invention relates to an arrangement for the vibration-insulating mounting of an electric motor on a carrier part via a carrier element (12) having a motor holding portion (24) for connection to the electric motor and a support-holding section (26) for connecting to the support part, wherein the are two holding sections (24, 26) via elastic, web-like connecting pieces (28) which are designed such that the two holding sections (24, 26) three-dimensionally, in all spatial directions, specifically axially, radially and tangentially, over a certain movement clearance are away relative to each other elastically movable. In order to reduce the manufacturing expense is provided, the two holding sections (24, 26) and the connecting pieces (28) form one piece with each other, wherein the support-holding section (26) for attachment to the carrier part spring-elastic clamping parts (36).