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.

Fan for combustion air

Abstract: A method and device for adjusting the air ratio of a gaseous fuel/air mixture for operating a burner (18) comprises measuring the mass flow (7) and the Wobbe (viscosity) index of the fuel (5), measuring the mass flow of the air (13) and controlling a mass flow on the basis of these values to give the predetermined value of lambda. An Independent claim is also included for a device for the above method having flow sensors and a data unit to regulate the fuel flow though a dosing valve.

Method and arrangement for commutating an electronically commutated motor

Abstract: An electronically commutated motor has a permanent-magnet rotor ( 124 ) having: at least two rotor poles ( 183, 186, 188, 189 ); at least one phase ( 126 ); a power stage ( 122 ); and a rotor position sensor ( 140 ). Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current ( 320 ): A) after a change of the rotor position signal ( 182 ), referred to as a first pole change, a first value (I_MEAS(HCnt−1)) of the current through the at least one phase ( 126 ) is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt−1)), a new commutation is carried out; C) after a change of the rotor position signal ( 182 ), referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt−1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.

Energy-conserving ventilating fan

Abstract: An electrically driven fan arrangement, suitable for energy-conserving installations, includes a fan, an electric motor ( 110 ) serving to drive the fan, and associated control apparatus, namely: a sensing apparatus ( 140 ) for sensing a volumetric air flow rate ( 125 ) generated by the fan ( 120 ) and for generating a measured volumetric air flow value (Vmess), and a volumetric flow rate control arrangement ( 160 ) for automatically controlling the volumetric air flow rate ( 125 ) generated by the fan ( 120 ) to a predetermined target volumetric air flow value (V_s). The volumetric flow rate control arrangement ( 160 ) is configured to generate a target rotation speed value (N_s) for the electric motor ( 110 ). A rotation speed controller ( 170 ), which automatically controls the rotation speed of the electric motor ( 110 ) to the target rotation speed rate (N_s) generated by the volumetric flow rate control arrangement ( 160 ), is also provided.

Stator for an electric motor having a temperature monitor

Abstract: A stator for an electric motor, in particular for an external rotor motor, includes a laminated stator core which is provided with a stator winding and having a connecting arrangement, which is arranged on one end side in the region of an end winding of the stator winding, for the purpose of electrically connecting winding wire ends of the stator winding and connecting wires of a temperature monitor connected upstream of the stator winding The connecting arrangement has an insulating switching disk which covers the region of the end winding, in particular in the form of a cap The temperature monitor is held in the switching disk in an integrated manner such that, on the end-winding side, it rests between the Mater winding and the switching disk such that it is in thermally conductive bearing contact with said stator winding

Method and arrangement for sensorless operation of an electronically commutated motor

Abstract: An improved electric motor has a rotor ( 124 ), a stator ( 125 ) having at least one phase winding strand ( 126 ), an output stage ( 122 ) for influencing the current flow in said phase winding strand, a DC link circuit ( 170 ) for supplying the output stage ( 122 ) with current, including a link circuit capacitor ( 178 ), and a control unit ( 132 ) having an arrangement ( 152 ) for sensing a value characterizing the current recharge into the link circuit capacitor ( 178 ), which control unit ( 132 ) is configured to specify commutation instants as a function of the sensed value, and to perform commutation operations in the power stage ( 122 ) at the commutation instants thus specified. Avoiding a need for prolonged “currentless intervals” permits achieving higher efficiency and power output, particularly in a motor having less than three winding phases.