Powerdrives Burning out Roboteqs

24th September 2004, 20:53

Hi

Having heard a few stories about Perm motors Technobot Power Drive motors buring out Roboteqs due to them causing huge voltage spikes when sudden reverse is used.

I was reading through the vantec website purely by chance and found this:
In this situation the batteries act as a voltage clamp protecting the controller. The battery chemistry must be healthy for this to occur. Dont add a series diode in line in the battery line because it will block the clamping action and the controller will fail. Some users place a large 100,000 ufd computer electolytic capacitor across the power going into the controller, a good idea, to further smooth the input voltage and clamping action.

Could this work with the roboteqs and possibly stop the problem?

Any ideas?

Regards
Ian

**grafix** · 24th September 2004, 22:15

no.

**bugs** · 25th September 2004, 02:55

No, as in: it wont stop the problem.

**m2xt** · 25th September 2004, 15:10

Roboteq and Technobots are still working to find a robust solution to this problem, a problem which we now understand. The voltage spike aspect has been resolved but the curent spike is being worked on. To give you some idea, we estimate a current spike in excess of 2200A being generated by the Power Drive motor in regen. Two solutions exist, either cope with this current or reduce the current. Once we have a proven solution, the Roboteq will take some beating in the world of DC speed controllers.

Paul

**grafix** · 26th September 2004, 21:49

See, ask a question and you shall get a good and honest answer from the man himself.

Mike.

**kane** · 27th September 2004, 09:59

The Roboteq already takes some beating in the world of DC speed controllers!

**bugs** · 27th September 2004, 10:41

Every pice of technoligy has its quirks. Theres no perfect speed controller, there probably never will be. At least not yet, mine is still on the drawingboard

**craig_anto** · 27th September 2004, 12:12

Tanto can run the power drives :P

**jamesb** · 29th September 2004, 13:17

just a suggestion, could a 1 farad power cap from something like a monster car stereo install be used to absorb the backwash of current. These regularly see over 2000A in top installs.

not looked into this, just askin

**kane** · 30th September 2004, 16:27

No,

well it could. But that wouldnt really fix the problem.

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