WAS BEDEUTET BACK EMF AUF ENGLISCH
Gegenelektromotorische Kraft
Die Gegenelektromotorische Kraft, die auch als elektromotorische Gegenkraft bekannt ist, ist die Spannung oder die elektromotorische Kraft, die gegen den Strom drückt, der sie induziert. CEMF ist der Spannungsabfall in einem Wechselstromkreis, der durch magnetische Induktion verursacht wird. Zum Beispiel ist der Spannungsabfall über einen Induktor auf das induzierte Magnetfeld innerhalb der Spule zurückzuführen und ist gleich dem Strom, dividiert durch die Impedanz des Induktors. Die Polarität der Spannung ist in jedem Moment die umgekehrte Eingangsspannung. Der Begriff Elektromotorische Gegenkraft, oder nur Back-EMF, wird am häufigsten verwendet, um sich auf die Spannung zu beziehen, die bei Elektromotoren auftritt, wo es eine Relativbewegung zwischen dem Anker des Motors und dem Magnetfeld von den Feldmagneten des Motors oder Wicklungen gibt. Aus dem Faradayschen Gesetz ist die Spannung proportional zum Magnetfeld, der Länge des Drahtes im Anker und der Geschwindigkeit des Motors. Dieser Effekt ist nicht auf die Induktivität des Motors zurückzuführen und ist ein völlig eigenständiger Effekt. Bei einem Motor, der einen rotierenden Anker in Gegenwart eines magnetischen Flusses verwendet, schneiden die Leiter die Magnetfeldlinien, wenn sie sich drehen.
Definition von back emf im Wörterbuch Englisch
Die Definition der Gegen-EMK im Wörterbuch ist eine elektromagnetische Kraft, die in einer induktiven Schaltung in einer solchen Richtung auftritt, daß sie einer Änderung des Stroms in der Schaltung entgegenwirkt.
10 BÜCHER, DIE MIT «BACK EMF» IM ZUSAMMENHANG STEHEN
Entdecke den Gebrauch von
back emf in der folgenden bibliographischen Auswahl. Bücher, die mit
back emf im Zusammenhang stehen und kurze Auszüge derselben, um seinen Gebrauch in der Literatur kontextbezogen darzustellen.
1
Sensorless Control of Two-phase Hybrid Stepper Motor Using ...
We have demonstrated in this thesis that HSMs are very efficient, robust, reliable, and cheaper actuators with the use of inexpensive H-bridge drive and new commutation method.
2
Control Techniques Drives and Controls Handbook
This voltage is the back electromotive force (back e.m.f.), and the direction of this
force is opposite to the terminal voltage applied. This value is directly
proportional to the rotational speed (in radians per second) and is given by the
following ...
Bill Drury, Institution of Electrical Engineers,
2001
Back EMF (Counter EMF) Remember that in a dc motor, as the armature rotates,
the armature coils cut the magnetic field and thereby induce a voltage, or
electromotive force (emf), in these coils. Since this induced voltage opposes the
applied ...
4
Advanced Physics Through Diagrams
This is known as a back EMF. At switch-on, when the coil is stationary, there is no
back EMF, so the current is high. As the motor speeds up, the back EMF rises and
the current drops. For higher B, the coil of a motor is normally wound on an ...
5
Energy-Efficient Electric Motors, Third Edition, Revised and ...
Many sensorless techniques are based on the back EMF of the machine.
Generally, these techniques are used for BLDC machines with trapezoidal back
EMF. For example, the zero crossing point of the back EMF voltage can be
detected.
6
Physics for Scientists and Engineers
1 5 consists of the external source of emf V and the back emf V of the motor, in
series with the total resistance R of the circuit. Because the angular speed w is
zero, the mechanical power output Pmech = T0w is zero as well. Next, suppose
that ...
7
Hard Disk Drive: Mechatronics and Control
Permanent magnet AC motors (PMACM) are available with two kinds of back-
EMF waveforms, (i) sinusoidal back-EMF and (ii) trapezoidal back-EMF with 120°
flattop as shown in Figure 4.43. A PMACM with sinusoidal back-EMF is ...
Abdullah Al Mamun, GuoXiao Guo, Chao Bi,
2006
8
Basic Electrical Engineering
D.C. CircuitsOhm s law and Kirchhoff s current law, Kirchhoff s voltage law - applications for the analysis of only series and parallel resistive circuits exited by independent voltage sources; Power and Energy in such circuits.
V.U.Bakshi U.A.Bakshi,
2007
9
Modern Electric, Hybrid Electric, and Fuel Cell Vehicles: ...
15,22,36 6.3.6.3 Methods Using Back EMF Sensing Using back EMF sensing is
the main approach in sensorless control technology of the BLDC motor drive.
This approach consists of several methods, such as (1) the terminal voltage
sensing ...
Mehrdad Ehsani, Yimin Gao, Ali Emadi,
2009
10
Understand Electronic Filters
But after that sudden change of v from 0V to 4V, it does not rise so fast and the
back emf is less than before. It falls from 4 V to zero and below. This allows some
current to flow and vr rises from 0V to about 4V. As in the capacitor circuit, there ...
10 NACHRICHTEN, IN DENEN DER BEGRIFF «BACK EMF» VORKOMMT
Erfahre, worüber man in den einheimischen und internationalen Medien spricht und wie der Begriff
back emf im Kontext der folgenden Nachrichten gebraucht wird.
Exploding Multimeter Battle Royale
the electrician who came to replace the bathroom power outlet said he has seen this kind of thing happen before, the back EMF from the arc ... «Hackaday, Jul 15»
Buoyancy is Underrated
... maybe (I don't know, just guessing) the Rosch generators have a low turning resistance (e.g. harnessing back EMF to facilitate the net gain ... «Pure Energy Systems News, Jun 15»
Meet the Simple Device That Could Revolutionize the Battery Industry
Next, during the time that PWM is off, for this portion of period, the stored energy due to back emf generates a polarity that adds to battery ... «ENGINEERING.com, Jun 15»
Renesas Electronics Simplifies Sensor-Less Brushless DC Motor …
... four input pins to implement rotor position detection for sensor-less BLDC motor control, basically to manage the motor Back EMF signals. «Business Wire, Mai 15»
Elon Musk Battery Singularity - 1000 Gigabattery factories for Grid …
... more practical and likely and fail to meet their basic need....as an example. a Pentode or Triode would be very resistant to both back EMF and ... «Next Big Future, Apr 15»
Seagate Enterprise Performance TurboBoost 15K 600GB HDD …
The drive flushes data stored in DRAM to the NVC with back EMF in the event of an unsafe power loss, creating an extra layer of power-loss ... «TweakTown, Feb 15»
Toshiba MG04SCA Enterprise HDD Review
As such, when a power surge or loss occurs, the back EMF energy of the spindle motor is used to power the write data loss protection circuitry ... «StorageReview.com, Jan 15»
Automated Table Saw Cuts Photovoltaic Solar Cells
As you turn it back the other way the speed will increase and as it does the torque will decrease until the speed is at maximum (back EMF is ... «Hackaday, Jan 15»
Nissan LEAF 100% Torque – Video
AS motors spins, the back EMF limits how much current you can crank into the motor. So, as soon as you connect the power back the motor, the spinning of the ... «InsideEVs, Dez 14»
The mystery of reed relays: Understanding specifications
They contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, a package and a method of connecting to ... «ElectroIQ, Okt 14»