ebm-papst

About: ebm-papst is a company organization based out in Mulfingen, Germany. It is known for research contribution in the topics: Rotor (electric) & Stator. The organization has 572 authors who have published 736 publications receiving 3763 citations.

Method of determining the rotational direction of an electronically commutated motor determines the course of the induced voltage by measuring characteristics at at least two positions

Abstract: A method of determining the rotational direction of an electronically commutated motor with a multiphase stator and permanent magnet rotor comprises finding the course of the induced voltage in a momentary current-less phase, or at a transistor, by finding characteristic values at at least two positions and thus finding the direction. Independent claims are also included for the following: (A) a motor for the above method;and (B) a method of sensor-less control of the commutation.

Method for implementing an electric installation

Abstract: The invention relates to a method for implementing an electric installation, in particular a ventilation system. Said electric installation comprises spatially distributed electromechanical functional units (1) which are arranged on specific constructional positions, said functional units being controlled in an individual manner by means of a (network)address (7) which is stored in an electronic form via a signal transfer network from a central control unit (3). Each functional unit (1) is provided with a first optical, electromagnetic and/or mechanical identification code (6) which can be read from the outside and which is clearly allocated to the device-specific internal address (7). Each functional unit also comprises a second optical, electromagnetic and/or mechanical additional code (8) which contains specific information and which can also be read from the outside. Both codes (6, 8) are detected in pairs and electronically stored and are transferred to the control unit (3) for further processing using optical, electromagnetic and/or mechanic reading means.

Novel motion sensorless control of high-speed small-power surface mount PMSM drives: With experiments

Abstract: Cost and reliability reasons lead to motion sensorless control of high speed PMSM drives. This paper introduces a novel emf based observer for rotor position and speed estimation that provides very fast starting from pre-produced zero initial position (less than 100 milliseconds from zero to 10 krpm in a 750 W surface PMSM) with very good dynamics response to large step torque perturbations. Implementations and test results fully validate the proposed control solution.

FEM assisted position and speed observer for BLDC PM motor drive sensorless control, with experiments

Abstract: In this paper, the authors propose and investigate a FEM assisted position and speed observer for brushless d.c. PM motor drive sensorless control, based on the line-to-line PM flux linkage estimation. The line-to-line PM flux may be estimated using measured currents and line-to-line voltages. The zero-crossing of the line-to-line PM flux linkage occurs right in the middle of two commutation points. The time period from one commutation point to zero-crossing is equal with the time period from zero-crossing to the next commutation point, at constant or slowly varying speed. This is used as a basis for the position and speed observer. For performance applications, in the present paper, the position between commutation points is obtained by comparing the estimated line-to-line PM flux with a look-up table, which contains the position versus FEM calculated line-to-line PM flux. A simulation model and experimental results are shown, demonstrating the reliability of FEM assisted position and speed observer for BLDC PM motor.

Radial fan wheel

Abstract: The invention relates to a radial fan wheel (1), in particular for use in gas fans with a steep fan characteristic curve. Said fan wheel is characterised as follows: it comprises a plurality of vanes (2) that are distributed over its circumference; the vanes (2) run, when viewed in the radial direction, from an inner intake region (4) to an outer exit region (6); when viewed in an axial direction, i.e. in the direction of the rotational axis (14), the vanes (2) run between an intake side (16) and an axially opposite hub side (18); on the intake side (16), the vanes (2) are connected along and beyond their radial extension to the exit region (6) to a cover plate (20), which comprises a central inflow opening (22) that opens into the intake region (4); on the hub side (18), the vanes (2) are only connected to a central hub (24) by their radially innerlying end regions; the vanes (2) and the cover plate (20) define an outer fan wheel diameter (D), which is at least ten times as long as an axially measured flow exit width (B) of the vanes (2) in the exit region (6).