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by pf26
29 Dec 2017, 19:19
Forum: Custom Applications
Topic: Brake at special position? is this possible ?
Replies: 1
Views: 398

Re: Brake at special position? is this possible ?

If you constantly send the same reference position, the motor will always try to move to that position. If you turn the motor axis away from this position, it will give a torque (depending on the maximum motor current you set) so as to return to this position. I think you better use rotary encoder w...
by pf26
29 Dec 2017, 09:00
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 3651

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

Unsoldering the FETs with hot air should be quite easy if you had a hot air station. I think you better leave the FETs in place and add a thick copper bar to the drain of the 3 top FETs, in order to connect them thermally with your aluminum case (it will connect these electrically too, unless you ha...
by pf26
28 Dec 2017, 17:53
Forum: Custom Applications
Topic: VESC for VR treadmill
Replies: 4
Views: 820

Re: VESC for VR treadmill

Yes it is (possible).
You need to firstly connect each VESC to the VESC tool and set a unique CAN ID for each VESC.
Now you connect both VESCs on the same CAN bus and send specific commands to each VESC using its CAN ID parameter.
by pf26
19 Dec 2017, 18:54
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 23562

Re: 14S VESC ?

I fear 13s is already quite risky.
12s is safe provided you have good capacitors near the VESC.
@ThierryGTLTS: did you use a VESC with regen at 13s, or know someone who did that for long times ?
by pf26
16 Dec 2017, 13:36
Forum: Related Hardware
Topic: Gate resistors in MOSFET
Replies: 3
Views: 760

Re: Gate resistors in MOSFET

When you want to control the MOSFET turn ON and OFF times, the gate resistor limit the gate currents and increase MOSFET switching times. Otherwise, the dV/dt would be higher, would generate larger RF emissions, and could be destructive (because of components and pcb parasitic inductance and capacit...
by pf26
14 Dec 2017, 09:37
Forum: Hardware Problems
Topic: Turnigy SK3 6374 149 motor
Replies: 5
Views: 902

Re: Turnigy SK3 6374 149 motor

With SK6374 149kV, I found:
R 0.0176 Ohms, L:20.87uH Lambda: 0.00496 Gain 47.92
by pf26
01 Dec 2017, 18:13
Forum: VESC Projects
Topic: VESC in homemade lathe/drill press
Replies: 11
Views: 2095

Re: VESC in homemade lathe/drill press

Most likely 30 is 60 (secondes per minutes) divided by 2 (because there are 2PI radians per turn).. Yes you probably need to change gearing to increase torque and reduce speed. As for the current, most of the time it will stay low, unless you really need torque for hard work - And only then you need...
by pf26
30 Nov 2017, 11:00
Forum: VESC Projects
Topic: VESC in homemade lathe/drill press
Replies: 11
Views: 2095

Re: VESC in homemade lathe/drill press

From the data given, this motor can be run at max 10s or 36V, and this translates into 36*245=8820RPM (already quite a lot for a relatively large motor) The continuous current is said to be 60Amps (most likely with good ventilation, because you have 0.03x60^2=108W joule losses inside the winding) 60...
by pf26
29 Nov 2017, 13:19
Forum: General
Topic: VESC & CAN Bus communication to another MCU (NOT VESC)
Replies: 17
Views: 5972

Re: VESC & CAN Bus communication to another MCU (NOT VESC)

I think your sendPacket function has flaws:
- your need to send extended packets, not standard ones. (ie: the IDE bit in the CAN frame should be set)
- you seem to send only your "data" array, not the packet bytes.

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