I have a Teknic brand servo motor which outputs a 50 Hz signal. The signal has a duty cycle proportional to rpm ranging from 0 to 1000 rpm. Thanks for any suggestions to get me going on a circuit to display rpm!
Interesting, perhaps a much easier solution than I had imagined! Thanks, I will start looking at analog meters now!You could feed the speed signal into a low pass filter and drive an analog meter.
It found quite a few analog meters that measure various ranges of DC voltage. I have a 5 volt signal with duty cycle such that 100% indicates 1000 rpm. I guess I could use a DC voltmeter 0-5v range and change the text on the meter to read 0- 1000 rpm instead of DC volts? I imagine that a circuit using a 555 timer and 7 segment displays might be cheaper. Many of the analog DC meters were more expensive than I was hoping for.You could feed the speed signal into a low pass filter and drive an analog meter.
Thanks! I did find some fairly inexpensive meters. Are the meters sealed or could take out the paper indicating 0-100% and print one of my own with rpm etc?+1 on Brevor's suggestion. I regularly use 1ma meters marked 0-100% with a trimpot in series for calibration as a quick indicators for PWM outputs. Bought surplus for cheap. Pick a pot value that will give 1ma (or whatever your meter needs) at 100% PWM output with some adjustment for calibration. At 50Khz, the meter inductance and inertia will give you all the filtering you need.
Have fun.
What kind of servo motor generates a 50Hz signal, where/how does it originate?I have a Teknic brand servo motor which outputs a 50 Hz signal. The signal has a duty cycle proportional to rpm ranging from 0 to 1000 rpm. !
+1 on Brevor's suggestion. I regularly use 1ma meters marked 0-100% with a trimpot in series for calibration as a quick indicators for PWM outputs. Bought surplus for cheap. Pick a pot value that will give 1ma (or whatever your meter needs) at 100% PWM output with some adjustment for calibration. At 50hz, the meter inductance, motor back emf and needle inertia may give you all the filtering you need. If not, the suggested filter should do it.
Have fun.
Yes, the drive is built in to the motor. I am very impressed with the motor and the documentation. I just wish they had a built in tachometer...What kind of servo motor generates a 50Hz signal, where/how does it originate?
Curious.
:
I think I see, it is a ECM or Electronically commutated motor with the controller built in by the look of it.
Max.
What is the exact model number of your motor?. I just wish they had a built in tachometer...
I have a ClearPath Integrated Servo Motor CPM-MCVC-3421S-RLNWhat is the exact model number of your motor?
Max.
Thanks, looks good!Heres a cheap DPM module. You would need to search for one with a suitable supply and input range. Ive seen them in the local shops too. You would need a constant dc supply and to scale the input to 999. Other dpms may be suitable too. Much easier than rolling your own.
http://www.amazon.com/Voltmeter-3-0~30v-Digital-Display-Detector/sim/B00M50SEYC/2/ref=pd_cp_hi_sexpl
Heres a cheap DPM module. You would need to search for one with a suitable supply and input range. Ive seen them in the local shops too. You would need a constant dc supply and to scale the input to 999. Other dpms may be suitable too. Much easier than rolling your own.
http://www.amazon.com/Voltmeter-3-0~30v-Digital-Display-Detector/sim/B00M50SEYC/2/ref=pd_cp_hi_sexpl[/QUOTE
Not able to find a scalable version. Can I scale with a circuit?
Also forgot that my motor is reversible. Do I need to have +/- 5v voltmeter?
by Duane Benson
by Jake Hertz
by Duane Benson