dc motor driver encoder signal

[gohpl]

Hi,

Currently, I am using Labview to monitor the encoder output signal. The motor that I am using is DC Micromotor series 1724T006SR with a push pull 4 channel driver L293B to obtain the encoder signal. The output signal from the encoder that I observed has spikes occuring at the rising and falling edges of my PWM signal. Please advise me on how I can eliminate the spikes. Thanks.

PL

[AnalogKid2DigitalMan]

You said you were using the 293 to obtain the encoder signal. The 293 is just the motor driver, it does not process the encoder signal. What make and model is the encoder and do you have a drawing or sketch of how it is wired up you can post?

You may want to look at powering the encoder from a different power supply than the motor to prevent conductive noise.

Also keep encoder wiring away from motor wiring. Use shielded cable for the encoder and only ground it at one end.

[gohpl]

I am using L293B to drive the DC micromotor series 1724T006SR. The encoder signal obtain from the motor is distorted. I have tried to use a 555 timer debouncing circuit to clean the encoder signal but the encoder signal only look cleaner after the motor has run continuously for around 10 mins. Please advice me. Thank you.

attached : specification of the dc motor I am using.

PL

[Brian_Beal]

You're not telling us what we need to know.  What encoder are you using, and what are you connecting the encoder to? 

[gohpl]

Magnetic encoder. It will connect to a decoder circuit to decode the signal.

[AnalogKid2DigitalMan]

gohpl:

About all I can suggest is to fix your decoder circuit to eliminate the spikes, based on the limited information you have provided.

Did you attempt the suggestions I first posted? Also is your decoder circuit running off the same power supply as your motor? I suggest you run the motor on it's own isolated supply, and all your other electronics from another.

[Brian_Beal]

Uncle!