Shenzhen (ecrazyman) Controller Information

20-mhz mod is easy. It took one minute. Bafang runs great at 72V and 30 amps w/ 20-mhz resontator!
 
shinyballs said:
Knuckles said:
Push either type motor too hard and, bammo! … Blown hall sensors. IMO the Bafang PMGR and Grubee DD motors should never be pushed beyond 72V & 30-amps. Even if you replace the wire harness with thicker phase wires (highly recommended btw. See ... http://endless-sphere.com/forums/viewtopic.php?f=2&t=4626), 2000W into the motor is about the max you can go without overheating the motor and blowing the hall sensors.
NEVER RUN THE BAFANG ABOVE 30 AMPS!

Hey, Maybe we should commission the Bafang Company to build a 5KW PMGR that we can push to 20KW!
Click to expand...

Is running Bafang at 72V & 30-amps continuous?
I'm really looking forward on the revised Shenzhen controller. So, Keywin is presently working on it, will they be ready next month?
Click to expand...
Knuckles said:
20-mhz mod is easy. It took one minute. Bafang runs great at 72V and 30 amps w/ 20-mhz resontator!
Click to expand...
Is it continuously or just for 1 minute?
 
deleted
 
aaannndddyyy said:
After using the Ecrazymans 48volt 28amp controller with the 24 MHz 3 PIN CERAMIC RESONATOR, fitted to an Ezee sprint Brushless 350 watt motor for the last week. The throttle seems a little unstable at low revs, it stays at a stable speed for a couple of seconds then accelerates slightly for a moment then back down to the stable speed again it may be doing the same thing at higher speeds but isn’t so Noticeable, is this because of the resonator? Or perhaps a wiring problem, I have changed the throttle over with a different one with the same affect and checked the connections. By the way under no load testing this problem doesn’t show up.
Click to expand...

Problem solved it was a wiring problem; took off all plastic connectors soldered the wires and used Heat Shrink Tubing, now it runs fine :D .
 
shinyballs said:
Is it continuously or just for 1 minute?
Click to expand...
72V nominal 30 amps continuous for as long as you want. But with a catch!
 
Knuckles said:
shinyballs said:
Is it continuously or just for 1 minute?
Click to expand...
72V nominal 30 amps continuous for as long as you want. But with a catch!
Click to expand...

So they're rated for MAX 28A, but you're saying 30A continuous? The catch is the 20Mhz mod correct or am I missing something? I'm trying to get my ducks in a row before parts start arriving.
 
28, 30, close enough. The controller will handle this all day with adequate cooling.

The motor might be another story.
 
The Bafang PMGR is a very powerful motor but it has nylon planetary gears.

The "catch" I speak of is that e brakes are essential for this motor to prevent some moron from braking and twisting the throttle at the same time.

At 72V and 30 amps the nylon gears will "shred" if you "power brake" the motor.

For my DD motors power braking usually causes hall sensor failure (rapid heat generated in the stator).

In the Bafang the hall sensors are fine but the planetary gears will turn to "peanut butter".

I don't use e brakes on my e bikes (why would I?) but when I lend my bike to someone else ... well that's when sh*t happens.

People just love to twist the throttle and apply the brake at the same time! Why? I do not know.

So e brakes are the rule when using the Bafang PMGR (at any voltage)! Sheeeet!

K
 
Knuckles said:
The Bafang PMGR is a very powerful motor but it has nylon planetary gears.

The "catch" I speak of is that e brakes are essential for this motor to prevent some moron from braking and twisting the throttle at the same time.

So e brakes are the rule when using the Bafang PMGR (at any voltage)! Sheeeet!

K
Click to expand...

Thanks for your reply. Does Keywin sell nylon gear replacments?

When you say "e brake" are you talking about regen braking or having a controller cut off switch mounted to your mechanical brakes so that when you hit the mech brakes the motor cuts out?

using throttle and the brakes is counter intuitive, it would feel un-natural to do it in a car for example. Perhaps some would do it on a bike though. Maybe a thumb throttle instead of a twist throttle would discourage that...
 
Nah! U get old, U forget coming up to stop signs etc!! I really ought to make a cutoff switch for my brakes, but I have a trike wih both front discs energised by one brake lever. Anyone got an idea?????? Its easy to screw up!
otherDoc
 
Knuckles said:
The Bafang PMGR is a very powerful motor but it has nylon planetary gears.

The "catch" I speak of is that e brakes are essential for this motor to prevent some moron from braking and twisting the throttle at the same time.

At 72V and 30 amps the nylon gears will "shred" if you "power brake" the motor.
Click to expand...

E-brakes are usually the norm for EVs, used for safety other than protecting the motor.

One more test to do is ride your bike like crazy for 200 - 600 - 1,000 miles @ 72v,30 amps and see how the nylon gears are holding up.

Does this motor have a hollow shaft where wires pass through it? If its does, this motor shouldn't be used for heavy loads - like in a tandem bike setup or heavy weight riders..
 
shinyballs said:
Does this motor have a hollow shaft where wires pass through it? If its does, this motor shouldn't be used for heavy loads - like in a tandem bike setup or heavy weight riders..
Click to expand...
Yes it has a hollow shaft on one side where the wires pass thru the axle. But all my DD motors have the same wire harness arrangement also.
 
voicecoils said:
Knuckles said:
The Bafang PMGR is a very powerful motor but it has nylon planetary gears.

The "catch" I speak of is that e brakes are essential for this motor to prevent some moron from braking and twisting the throttle at the same time.

So e brakes are the rule when using the Bafang PMGR (at any voltage)! Sheeeet!

K
Click to expand...

Thanks for your reply. Does Keywin sell nylon gear replacments?

When you say "e brake" are you talking about regen braking or having a controller cut off switch mounted to your mechanical brakes so that when you hit the mech brakes the motor cuts out?
Click to expand...
Keywin is sending me replacement nylon gears right now. I also asked him to ask Bafang if they make steel or alloy planetary gears.
When I say "e brake" I mean motor kill switch in the brake handle and not regen capability.

I don't know if the Bafang PMGR can be used for regen but I did notice the hall sensors are showing voltage changes when I rotate the wheel forward slowly (freewheel direction). I was surprised because I thought the rotor was stationary during freewheel. Apparently it is not but the wheel does spin effortlessly during freewheel.

Hmmmm. Maybe time to split this topic off into a Bafang PMGR analysis thread.
Heck (an update) ... See http://endless-sphere.com/forums/viewtopic.php?f=3&t=4892&start=30#p75673
 
Knuckles said:
Hmmmm. Maybe time to split this topic off into a Bafang PMGR analysis thread.
Click to expand...

Yes, please. I'd like to keep the controller discussion separate from the motor discussion.

Try shorting all the motor phase wires together and turn the wheel forward. Compare resistance to backward direction.
 
fechter said:
Try shorting all the motor phase wires together and turn the wheel forward. Compare resistance to backward direction.
Click to expand...
Excellent idea of using "regen braking" to test if there is an internal freewheel in the hub motor.
 
docnjoj said:
Nah! U get old, U forget coming up to stop signs etc!! I really ought to make a cutoff switch for my brakes, but I have a trike wih both front discs energised by one brake lever. Anyone got an idea?????? Its easy to screw up!
otherDoc
Click to expand...

i use a reed switch mounted to the brake body and a magnet mounted to the lever for my e-brakes.

image101.jpg

image102.jpg

View attachment 3

View attachment 2

image107.jpg

image105.jpg

This arrangement is almost universal.

rick
 
Thats super clever1 Dont U have a kit I can buy. Gettin all those parts is a big job for a lazy guy!
otherDoc
 
docnjoj said:
Thats super clever1 Dont U have a kit I can buy. Gettin all those parts is a big job for a lazy guy!
otherDoc
Click to expand...

Actually i do. PM me for details.

rick
 
Knuckles, I have the direct drive 500W 48V Grubee hub motor. In an earlier post I saw the following connection setup for the throttle. Do the throttle indicator lights still work (Power, Full, Empty)?

Controller ... Grubee Throttle
Green ........White
Black .........Black
Red ...........Red
(Purple not used)
 
The crazydude throttle does not have LEDs. It really doesn't matter because the Grubee throttle (a standard Chinese throttle btw) LEDs only light up yellow after you are out of voltage anyway. I figure what's the point! I kind of prefer the full handle throttle from crazydude anyway. It feels better imo.

K
 
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