Tagged Questions
3
votes
1answer
87 views
What is the function of a capacitor in a motor circuit?
I read a manual of how to connect a speed controller to a motor. I see there is a capacitor as shown below. My question is what the function of the capacitor is? Thanks
3
votes
2answers
155 views
Maximum power for Arduino Monster Moto Shield
I'm reading the specs for the SparkFun Monster Moto shield which specifies that
Max Voltage is 16V
Maximum Current 30A
Given Ohm's law, does that mean that the maximum power is 480 watts? That ...
1
vote
3answers
212 views
Does anyone build 100k RPM alternators?
What I'm contemplating is the practicality of building a direct drive turbine-alternator (or generator) system out of an engine something like this.
Based on some reasonable guesses, that would take ...
3
votes
1answer
182 views
DC motor vs AC motor weight considerations
For a given power rating, does a permanent magnet DC motor have a weight advantage over either a three phase permanent magnet synchronous machine, or vice versa? Or does it work out that they would be ...
7
votes
6answers
346 views
Why are battery-powered appliances and tools specified in volts? [closed]
"Powered with a suction of 18 volts"
Isn't this just a nonsensical "bigger is better" measure?
The thing you really care about as a customer is the motor's torque or power or RPM or something ...
1
vote
2answers
113 views
Switching regulator to power motor
I am trying to power my servomotor only for a short period of time (controlled by my MCU). I have seen I could use a switching regulator (3 pins). The thing is that I am working with really low power. ...
0
votes
1answer
202 views
Electric Power Systems for a qudrocoper base on 30amp Speed Controller and NX-4008-620 - NX-4008-620kv Brushless motor
I'm in mood to put together my own quadrocopter. Just before I ordered parts wanted to some experts to tell me if configuration if compatible enough. Or maybe you have better suggestions for this ...
3
votes
1answer
187 views
Synchronous motor mystery
Not too long ago I acquired an old ('70/'80) German flip clock. I found out that this clock is driven by a one-phase synchronous engine.
I can't get the motor to run. I (carefully!) connected the ...
1
vote
1answer
129 views
Circuitry for Running Many Small Motors
I'm creating a simple vibration mat for a child which will be triggered by a force sensor. I'm not trying to do anything complex (like changing frequency of vibration) - simply an on/off circuit. What ...
1
vote
1answer
446 views
how to control brushless dc servo motor?
I have one of this motor and would like to make a controller for it ( just a speed controller with regulator that change speed from zero to maximum. ). I know micro controller and embedded system, but ...
4
votes
1answer
736 views
how to read battery spec?
I window shopped for a small size battery. On the battery specifications, there are:
capacity(mAh) : 85mAh
Pulse Current(mA) : 190
Cycle Life(Times) : 300
What does Pulse Current mean? Does it ...
1
vote
2answers
399 views
Powering a Servo: Do I need a separate power source?
I have a project that utilizes two strong digital, coreless servo motors. Whenever I use DC motors, I usually need to have separate power sources for both the microcontroller and the motors (due to ...
2
votes
1answer
619 views
3 phase ac induction motor speed control
I need to speed control small ( 0.25 HP ) 3 phase 2800 rpm motor to achieve speed in the range of 6000-7000 rpm. I know basic stuffs. ( have created soft starter etc ... which is good enough for ...
