Ebm-papst Mulfingen Gmbh & Co Kg

Fabian Schneider

Sebastian Schroth

Ralph Wystup

Martin Bürkert

Thomas Kilian

Helmut Lipp

Marco Weckert

Alex Schneider

Daniel König

Georg Wiedmann

Steffen Hanselmann

Fabian Wagner

Daniel Koenig

An analog circuit arrangement () to variably set a voltage U, within defined voltage limits, has a non-inverting adder () with a positive input (). A voltage divider (), with at least a first stage () and a second stage (), is connected to the positive input () of the adder (). At least one stage has a parallel circuit of n resistors (R, R, . . . , Rn) that are each connected in series in a conduction path (L, L, . . . , Ln) to an overcurrent protection device (F, F, . . . , Fn). At least one device () actively changes one or more of the overcurrent protection devices (F, F, . . . , Fn) into a state that interrupts the respective affected conduction path (L, L, . . . , Ln).

Analogue voltage programming

A single-strand EC motor with a winding strand with two winding connections, has a current regulating device in the winding strands between the winding connections. The current regulating device regulates the winding current of the single-strand EC motor during a first commutation phase with a positive current flow and a second commutation phase with a negative current flow. In each case, at a constant value. The value of the average output voltage uw(t) of the current regulator is used to ascertain the commutation time.

Sensor-free commutation method

The disclosure relates to the operation and a circuit arrangement for a network connection variable with regard to the input voltage (1-phase/3-phase), which is connected using a centre tap (M) between the capacitors (C) via a connecting line to a neutral conductor (N) of an input AC voltage source.

Device for efficient DC link processing independent of grid type

An arrangement () with an electronically commutated motor has an interface () for inputting analog setpoint signals (S) for the motor. The motor is powered, during operation, by an AC network via an electronic commutation system (). The interface () is galvanically isolated from the electronic commutation system () by a galvanic isolation (). Furthermore, for the transmission of an analog setpoint signal (S), a bitstream signal production device () is provided on the galvanically isolated interface side. Also provided is a transmission device (), for transmitting the produced bitstream, as well as a signal-processing device (). They are on the non-galvanically isolated side for the signal evaluation of the bitstream.

Arrangement for transmitting desired value signals for an electronically commutated motor

The present invention relates to an overvoltage protection circuit () for protecting the electronics of a motor, in particular of an EC motor, against overvoltage pulses, with two protective devices (FS, FS) arranged in series connection between two connections (), wherein a resistor (R) or (R) is connected in parallel to each of the protective devices (FS, FS) and at least one capacitive element (C) is provided in parallel connection to the first protective device (FS), wherein the overvoltage protection circuit () has, between the connections (), at least a first (lower) and a second (higher) breakdown voltage point at a voltage Uor Udependent on the voltage change over time k=(dU/dt) of a voltage Uat the connections ().

Overvoltage protection circuit

The present disclosure relates to an electronic circuit for detecting the current winding temperature of phase windings and/or other characteristics of an electronically commutated electric motor, which is connected, or can be connected, to a frequency converter, comprising one or more capacitive two-terminal networks with a temperature-dependent impedance, each network being arranged parallel to two winding terminals (u, v, w) of the phase windings, as well as a detector for detecting the current responses in the motor feeds on the basis of steep-flanked voltage changes at the output of the frequency converter.

Temperature monitoring

The present invention relates to a circuit arrangement and to a method for sensorless commutation of electronically commutated synchronous machines such as, for example, EC motors, wherein the terminal values at the connection terminals of the synchronous machine are processed by means of a rotor position estimator based on the EMF of the synchronous machine and of a known motor model preferably in a PLL structure for sensorless determination of rotor position information, and said information is used for commutation.

Sensorless commutation method

The present invention relates to a control system and a method for raising the mains-side power factor &#x3bb; of three-phase fed EC motors having a dc voltage intermediate circuit () with an intermediate center tap (DCM) for generating a positive and a negative intermediate circuit potential (DC+, DC&#x2212;), comprising three active bridge arms (Ia, IIa, IIIa), each of which are connected to a subordinate two-point current control (ZPR, ZPR, ZPR) and, in each case, via said current control to a superimposed intermediate circuit voltage control (), which controls the potential difference between the middle circuit potentials (DC+, DC&#x2212;) via set point settings for the subordinate two-point current controllers (ZPR, ZPR, ZPR).

System to increase the in-line power factor of a three-phase brushless DC motor

An electronic circuit comprises at least one semiconductor switch mounted with its switching path in series with an inductive load to be triggered, and at least one freewheeling element that interacts with the semiconductor switch during switching phases and is also mounted in series with the load. A control unit controls a control connection of the semiconductor switch with a variable control current as a function of the time profile of a voltage measured at the freewheeling element and/or as a function of the time profile of the voltage measured at the switching path. A method for triggering a semiconductor switch of such a circuit, triggered by a variable control current for switching, the control current predefined as a function of the time profile of a voltage measured at the freewheeling element and/or as a function of the time profile of the voltage measured at the switching path.

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Rot am See, Germany

Fabian Schneider