Search found 110 matches

by Hummie
12 Sep 2016, 06:41
Forum: General
Topic: Getting max power using the motor and battery amp limits
Replies: 13
Views: 8380

Re: Getting max power using the motor and battery amp limits

I'm set to 70/70. The motors can't do that continuously but it's great for blasting up hills as u say. I'd like to get as much power out for short bursts and keep pushing numbers higher. Can I do this safely since there's a auto shut-off if things overheat on the vesc? I think I will know before I h...
by Hummie
12 Sep 2016, 06:22
Forum: General
Topic: Vesc lvc and braking downhill
Replies: 29
Views: 5833

Re: Vesc lvc and braking downhill

Ok. So when it's freewheeling downhill but not overly fast where's the energy going that's being created by the motor? It's enough to burn the vesc of the batteries aren't there, but if they are there it's still not going to them
by Hummie
11 Sep 2016, 16:56
Forum: General
Topic: Vesc lvc and braking downhill
Replies: 29
Views: 5833

Re: Vesc lvc and braking downhill

I was wondering and writing about coasting. When ur coasting the motor is generating no? I thought u wrote it will not charge the battery though unless u go fast enough to produce a voltage higher than the battery voltage
by Hummie
10 Sep 2016, 17:08
Forum: General
Topic: Getting max power using the motor and battery amp limits
Replies: 13
Views: 8380

Re: Getting max power using the motor and battery amp limits

Was vedder's overlay video done in bldc or FOC? Do u think the equation will be different depending on the different program? But why would u think 1000watts at close to zero rpm would be more of a problem than at a higher speed? Just a bit more wind but otherwise isn't it the same? I feel lthe more...
by Hummie
09 Sep 2016, 19:17
Forum: General
Topic: Vesc lvc and braking downhill
Replies: 29
Views: 5833

Re: Vesc lvc and braking downhill

if going downhill coasting there is power being produced in the motor. supposedly you must be going fast enough to produce a voltage higher than the battery's to recharge the battery. what happens to the power being produced by the motor if you arent going fast enough to be producing a voltage as hi...
by Hummie
09 Sep 2016, 18:20
Forum: General
Topic: Getting max power using the motor and battery amp limits
Replies: 13
Views: 8380

Re: Getting max power using the motor and battery amp limits

Is that 240 amp limit continuous? that's huge. at very slow speeds there will be a low duty cycle and therefore whatever amps are being applied to the motor would be for a fraction of a second no? I pull 1000 watts from the battery per motor and I cant see when it's happening but I thought it would ...
by Hummie
09 Sep 2016, 15:01
Forum: General
Topic: Getting max power using the motor and battery amp limits
Replies: 13
Views: 8380

Getting max power using the motor and battery amp limits

will this method/formula get me safely to a determined max power? :start with the question: "how many watts do I want available full throttle very close to 0 rpm?" If the answer is: 1000 watts Battery Voltage: 50V Winding Resistance: 0.12566ohm Ohm's Law: (Calculate Effective Motor AC Volt...
by Hummie
09 Sep 2016, 14:33
Forum: General
Topic: Vesc lvc and braking downhill
Replies: 29
Views: 5833

Re: Vesc lvc and braking downhill

The VESC uses about 1W "standby" (oops. Mine has been drawing that from an nearly empty battery with no BMS since friday). It continues to do that as long as the BMS does not cut the power. When you brake, I think the low voltage cutoff will slightly limit the allowed current, but the vol...
by Hummie
07 Aug 2016, 19:21
Forum: General
Topic: VESC at high Voltage (and KV)
Replies: 14
Views: 5388

Re: VESC at high Voltage (and KV)

Does a motor run more efficiently at a speed based on its total battery no-load speed or when talking about the no-load speed is it always changing based on the duty cycle/throttle and therefore as long as the motor is large enough it will run just as efficiently at any rpm? When battery current is ...
by Hummie
07 Aug 2016, 17:04
Forum: General
Topic: where does the mosfet temp value come from?
Replies: 6
Views: 2897

Re: where does the mosfet temp value come from?

so even though there are different graphings of temp for different fets that show up on the bldc tool realtime data they're all hooked to the same temp sensor?

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