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.

Motion sensorless control of BLDC PM motor with offline FEM info assisted state observer

Abstract: This paper describes a new offline FEM assisted position and speed observer, for brushless dc (BLDC) PM motor drive sensorless control, based on the line-to-line PM flux linkage estimation. The zero-crossing of the line-to-line PM flux linkage occurs right in the middle of two commutation points, which is used as a basis for the position and speed observer. For performance applications, the position between commutation points is obtained by comparing the estimated line-to-line PM flux linkage with the FEM calculated line-to-line PM flux linkage. Even if the proposed observer relies on the fundamental model of the machine, a safe starting strategy under heavy load torque, called I-f control, is used, with seamless transition to the proposed sensorless control. The I-f starting method allows low-speed sensorless control, without knowing the initial position, and without machine parameters identification. Digital simulations and experimental results are shown, demonstrating the reliability of the FEM assisted position and speed observer for BLDC PM motor sensorless control operation.

Method for Starting a Combustion Device Under Unknown Basic Conditions

Abstract: A method for starting a combustion device, in particular after a first ignition failure, in particular for starting a gas burner under unknown basic conditions, wherein a characteristic diagram of a start air ratio depending on the burner temperature known from empirical analysis is stored for the combustion device in a memory, wherein a calibration of the starting process is performed, wherein the ratio of opening of the gas valve (w) to air volume mL necessary for ignition is iteratively determined by variation of the gas and/or air volume; and in case of ignition, the combustion device is started and the applicable air ratio (λ)IGNITION is stored.

Rotor-position sensor assembly and method for detecting a rotor position

Abstract: The invention relates to a method for operating an electric motor comprising a stator, an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality of sensor poles (55), at least one rotor-position sensor (42, 44) that is connected to the stator and a rotor-position evaluation device. The method comprises the following steps: The rotor-position sensor(s) is/are used to generate at least one rotor-position signal that is dependent on the rotational position of the sensor magnet (54). The rotor-position signal or signals is/are fed to the rotor-position evaluation device, where it is or they are converted into at least one digital value with a resolution of at least 2 bits, whereby said signal or signals can also be converted into different digital values dependent on rotational positions inside the sector of the sensor pole. The invention also relates to an electric motor comprising a stator and an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality SP of sensor poles (55), at least one rotor-position sensor (42, 44) for generating a rotor-position signal, a rotor-position evaluation device for generating an absolute value for the rotor position, said device comprising an A-D converter (144) with a resolution of at least 2 bits, the rotor-position sensor or sensors (42, 44) being connected to the A-D converter.

Fan having an integrated ip protection

Abstract: A fan has a fan housing (2), which is provided with a pot-like recess (4), and it has an external-rotor drive motor (103) that comprises an internal stator (22) and an external rotor (34) separated therefrom by an air gap (52). The internal stator (22) is mounted on a bearing supporting tube (24), which is joined to a base part (46), and the assembly consisting of the bearing supporting tube (24) and of the base part (46) form, together with the pot-like recess (4) of the fan housing (2), an annular space (54) that surrounds the internal stator (24, 26) in an essentially fluid-tight manner. A wall (56) of this annular space (54) extends like a slotted tube through the air gap (52) that is situated between the internal stator (22) and the external rotor (34).

Method for starting up an electrical installation

Abstract: The method involves having an electric installation with spatially distributed electromechanical functional units (1) which are arranged on specific constructional positions. The functional units are controlled in an individual manner by 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 is provided with a first optical, electromagnetic and or mechanical identification code (6) which can be read from the outside and which is allocated to the device-specific internal address. Each functional unit also has 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 reader.