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.

Speed control method and device for a two-pulse motor operating with auxiliary torque

Abstract: The invention relates to a method for rotational speed control of a two-pulse electronically switched motor which operates with an auxiliary reluctance torque (fig. 13:MR) and comprises at least one stator winding strand (32), a rotor (38) and a control unit (76) for controlling the motor (30) at a desired rotational speed (nsoll; t s). The inventive method consists in continuously collecting the characteristic value of the rotor (38). Above a determined minimum rotational speed (+NMIN, -NMIN), the operation of the motor (30) is adjusted to an independent value (BW) of a desired rotational speed. Above said minimum rotational speed (+NMIN, -NMIN), the operation of the motor (30) is adjusted to a value (BW) which is a difference function between the desired rotational speed (nsoll; t s) and an actual rotational speed (n; T HALL). A corresponding motor is also disclosed.

Slide caliper assembly and method of use

Abstract: A slide caliper assembly comprises a caliper including a shaft defining a gaging surface. A first jaw is coupled to and a second jaw is slidably coupled to the shaft. Each jaw defines a gaging surface. One of the jaws is adjustably pivotable relative to the shaft about a pivot axis coinciding with an intersection of the gaging surface of the shaft and another axis extending along the associated gaging surface of one of the jaws. A case houses the caliper, and has a plurality of side edge sections defining a periphery of the case. One side edge section and an adjacent side edge section form a non-right angle therebetween such that the shaft can abut the side edge section, the first jaw can abut an adjacent side edge section, and the second jaw can abut another adjacent side edge section for calibrating or demonstrating the use of the caliper.

Arrangement with an electronically commutated external rotor motor

Abstract: The invention relates to an arrangement with an electronically commutated external rotor motor (20), comprising an inner stator (22), arranged on a bearing tube (30), separated from an external rotor (26; 92) by a first air gap (24), comprising a rotor bell housing (40), open at one end and connected to a shaft (46) at the other end, mounted in the bearing tube (30), further comprising a permanent magnet arrangement (76), arranged at the open end of the rotor bell housing (40), for interaction with a second permanent magnetic rotor (92), mounted in the arrangement such as to be able to rotate, said permanent magnet arrangement (76) being separated from said second rotor (92) by a second air gap and forming a magnetic coupling (94) therewith, such that a rotation of the permanent magnet arrangement (76) causes a rotation of said second rotor (92). The above also comprises a non-ferromagnetic separating element (82), arranged in the second air gap which separates the second rotor (92) from the external rotor motor (20) in a liquid-tight manner and on which an arrangement for mounting the second rotor (92) and the bearing tube (30), for mounting the shaft (46) of the rotor bell housing (40), are arranged.

Device comprising a plain bearing

Abstract: The invention relates to a device comprising a plain bearing (36), which contains ferromagnetic material and which is provided for radially supporting a shaft (34) that is made of ferromagnetic material. The shaft (34) is mounted in said plain bearing (36) in a manner that enables it to rotate and be axially displaced and has a free end (35). A footstep bearing is provided on the latter, comprises a step rounding (66),which is provided on said free end (35), and comprises a contact element (68, 69) that interacts with the step rounding. This contact element (68, 69) consists, at least in part, of a ferromagnetic material. In addition, at least one permanent magnet (72) is provided, which is placed in the area around the free shaft end (35) between the axial end of the plain bearing (36) at that location and the contact element (68) in order to form a magnetic circuit (82) starting from one pole (74) of the at least one permanent magnet (72) to the other pole (76) of the at least one permanent magnet (72) while passing via the plain bearing (36), the free shaft end (35), the step rounding (66) and the contact element (68). This results in inducing a defined magnetic attractive force between the step rounding (66) and the contact element (68).

Method and control system for transforming an AC voltage into a consumer supply voltage with adjustable rms value

Abstract: The method involves changing a single-phase or multi-phase supply alternating current (AC) voltage (Un) over distribution of a phase angle with respect to instantaneous values (Un') of the AC voltage based on a preset function about a factor. The changing of the AC voltage is taken place so that an operating voltage (UM) is generatable about the phase angle with distribution of instantaneous values from 0 to 100 percent of the associated instantaneous values of the AC voltage. The AC voltage is reformed into the operating voltage by a changeable control element (6). An independent claim is also included for a control system for reforming a sinusoidal supply alternating current (AC) voltage into an operating voltage for an electric consumer.