Search found 943 matches

by rew
30 May 2018, 06:45
Forum: General
Topic: Sensorless tach with brushed motors
Replies: 2
Views: 264

Re: Sensorless tach with brushed motors

Let me get this straight. You have a brushed motor and you want to have SOME feedback on how fast it is going from the motor controller without having to install the hardware that measures this. Right? With most motors and most dutycycles, the current does not return to zero. So during the PWM OFF p...
by rew
30 May 2018, 06:24
Forum: General
Topic: Editing pin configuration?
Replies: 1
Views: 171

Re: Editing pin configuration?

That configuration is mostly in hwconf/hw_<name-of-your-hardware>.h (and .c).
by rew
22 May 2018, 05:24
Forum: Feature Requests
Topic: Sleep mode
Replies: 10
Views: 4411

Re: Sleep mode

I would guess that the push-to-wake function works by rectifying the motor voltage through the mosfets. This happens automatically. So even with the battery disconnected, you will be able to power up the motor controller. Then the motor controller can arrange to enable the battery.
by rew
22 May 2018, 05:17
Forum: Hardware Problems
Topic: 3.3V Problems with VESC hw4.12
Replies: 4
Views: 380

Re: 3.3V Problems with VESC hw4.12

Well... the DRV should be functioning as a switching regulator to make 5V. If that doesn't happen, the DRV is broken, or somehow not correctly connected. Can you measure a short between the 5V and GND? There is a zener that tries to keep 5V at "near 5V" levels when the DRV misbehaves and t...
by rew
22 May 2018, 05:12
Forum: FOC
Topic: AC induction motor
Replies: 10
Views: 2005

Re: AC induction motor

Still one year later, the situation is the same: nobody has written the firmware yet.

I'd say that you could give it a go with "foc openloop" and see how close that comes to running the motor acceptably.
by rew
03 May 2018, 06:35
Forum: General
Topic: Make Upload Error
Replies: 6
Views: 563

Re: Make Upload Error

Flashing the binary into the F411 on the discovery board is an "exercise" to see if you have the software and commands set up correctly. The next step is to remove the jumpers hook up the cable to the target VESC and program the VESC. If that does not work, it would seem your connections a...
by rew
30 Apr 2018, 06:45
Forum: General
Topic: Make Upload Error
Replies: 6
Views: 563

Re: Make Upload Error

That "target voltage" line is always weird. The official programmers always have this as an input on the programmer, if it would be a power-to-the-target, you cannot know how much power the target will need and you could get into trouble. On my programmers the software always reports somet...
by rew
22 Apr 2018, 13:48
Forum: FOC
Topic: DRV8302 faults with FOC
Replies: 27
Views: 14499

Re: DRV8302 faults with FOC

What kind of current are you pushing through the motor? What is it rated for?
by rew
22 Apr 2018, 13:46
Forum: Custom Applications
Topic: 5 VESC control for Mars Rover
Replies: 1
Views: 467

Re: 5 VESC control for Mars Rover

For "neatness" I would add a CAN interface to the beaglebone and control everything from there. For "lowest amount of hardware" you could consider having one VESC be an uart-CAN bridge. But that optimization is something that would come back to haunt you later. Not exactly sure h...
by rew
15 Apr 2018, 06:25
Forum: FOC
Topic: adjusting the F_SW and other attempts at silence
Replies: 1
Views: 347

Re: adjusting the F_SW and other attempts at silence

When you move F_SW up, the amount of time spent in the "every F_SW" interrupt (ADC interrupt) goes up. Measurements of the "time left" indicate that about 50% of the time is still not spent in the interrupt. So you could double F_SW. But the occasional overrun is probably quite b...

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