power factor in the electrical power
power factor in the electrical power
(OP)
Hallo everybody,
i am measuring the current and voltage in a Brushless motor. the motor with its electronic is to a battery connected. I am measuring the current and voltage between the Battery and the motor. Since the Brushless motor with its electronic is a DC Device do i need to include the power factor in the electrical power consumption calculation?
Thank you for your Help
i am measuring the current and voltage in a Brushless motor. the motor with its electronic is to a battery connected. I am measuring the current and voltage between the Battery and the motor. Since the Brushless motor with its electronic is a DC Device do i need to include the power factor in the electrical power consumption calculation?
Thank you for your Help





RE: power factor in the electrical power
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: power factor in the electrical power
RE: power factor in the electrical power
The obvious answer is NO. You don't have power factor in a DC circuit.
The afterthought is Why not?
There are two power factors: the displacement power factor aka cos(phi) and the generalised power factor defined as P/S.
Since P is power developed in a load and S Is A times U, you could actually have something like a PF in a DC circuit.
I have never thought of it that way. How about other members?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: power factor in the electrical power
Technically, I think you are right as far as the distortion pf where an AC line is being fed to a DC power supply. In fact I think it is something often overlooked when considering generator sizing on loads where the pf will make a significant difference.
But in this case, he specifically said he is feeding it with a battery which is a purely DC source to start with. So how is your voltage "wave form" going to be leading anything?
RE: power factor in the electrical power
With all respect, are we not using different words to describe efficiency when we talk about power factor in a DC circuit?
However itsmoked may have a point. I will spend a few days running over in my mind the the possible consequences of applying a PWM potential to the inductive components in a DC circuit. Will the charging charging and discharging of the magnetic fields result in the DC equivalent of a power factor or will the charging component of the current be cancelled by the discharging component of the current?
Interesting!
Respectfully
RE: power factor in the electrical power
standard low frequency (50/60 Hz) systems, and use efficiency
or "Q" in relation to other circuits. DC just has losses. :)
<als>
RE: power factor in the electrical power
RE: power factor in the electrical power
I did stress that I was not talking about displacement power factor. So no need for a voltage waveform to lead or lag. Also, I did not think of efficiency.
As I said. I hadn't thougt about it that way before. And I probably shouldn't onwards either.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: power factor in the electrical power
RE: power factor in the electrical power
RE: power factor in the electrical power
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: power factor in the electrical power
Leading/lagging only applies to displacement pf. Distortion pf cannot be described as leading or lagging.