mbx5 + mamba max + lipo 4s + WHAT MOTOR ???

[kevin1]

ok, I had talk with a person who had say to me that for exemple the ACn22/35/1E,
her max current is 60A and it is too low, the motor will become very hot,
and in 4s, he give only 950 Watts !

what do you think about this ?

[lutach]

Originally Posted by kevin1

ok, I had talk with a person who had say to me that for exemple the ACn22/35/1E,
I is at 60A and it is too low, the motor will become very hot,
and in 4s, he give only 950 Watts !

what do you think about this ?

My motor is only rated for 70A and is smaller than the 22/35. Mega uses continuous rating and your motor will put out more power. I've seen spikes of 90A with my motor. Keep in mind that electric motor makes power from torque and the Mega being a 6 pole motor has tons of torque. If you see some graphs from data loggers, you will only see the spike and then the AMPs fall as the vehicle starts moving.

[kevin1]

Originally Posted by lutach

My motor is only rated for 70A and is smaller than the 22/35. Mega uses continuous rating and your motor will put out more power. I've seen spikes of 90A with my motor. Keep in mind that electric motor makes power from torque and the Mega being a 6 pole motor has tons of torque. If you see some graphs from data loggers, you will only see the spike and then the AMPs fall as the vehicle starts moving.

ok, and on the mbx5 in 4s,
he don't will become very hot ?

and what is his power (in this configuration) compared at a nitro buggy ?


thanks

[lutach]

Originally Posted by kevin1

ok, and on the mbx5 in 4s,
he don't will become very hot ?

and what is his power (in this configuration) compared at a nitro buggy ?


thanks

My set up makes 1600+ watts with 22.2 volts. You can't just calculate the watts from the conservative rating Mega puts on their motors. The ACn22/35/1E will make more torque then my ACn22/30/2 and all you will need to do is find the right gearing for your vehicle. My truck has the 3.30 buggy diffs, 49T spur/14T pinion and my final ratio is 11.55. My motor never got hot at all and the Mega 35/1E will make more torque.

[kevin1]

ok and for you,
the ACn22/35/1E in 4s has same, more or less power (generaly power) than nitro ?

[lutach]

Originally Posted by kevin1

ok and for you,
the ACn22/35/1E in 4s has same, more or less power (generaly power) than nitro ?

My truggy will beat a nitro. You should be able to beat one as well when you do find the right gearing. Here is what I got from Brian's speed calculator:

Spur/Pinion Reduction Ratio: 3.5 : 1
Total Reduction Ratio: 11.57692 : 1
Tire Circumference: 17.75 inches (450.85 mm)
Total Motor Speed: 37311.6 RPM
Theoretical Vehicle Speed: 54.17 mph (87.02 km/h)
Theoretical Speed Rate: 2.44 mph/V (3.92 kmh/V)
Adjusted Vehicle Speed: 50 mph (81 km/h) - 7% loss
Calculated Loaded KV value: 1680.7
Calculated Motor Torque: 0.28 ft-lbs
Calculated Final Torque: 3.22 ft-lbs
Calculated Motor Power: 1554 watts (2.1 HP)

I wanted to use a smaller pinion, but with my MBX5T the 14T is the smallest I can use. If you go with a 16T pinion and 49T spur, this is what you might get:

Spur/Pinion Reduction Ratio: 3.06 : 1
Total Reduction Ratio: 10.12981 : 1
Tire Circumference: 14.01 inches (355.89 mm)
Total Motor Speed: 37740 RPM
Theoretical Vehicle Speed: 49.43 mph (79.41 km/h)
Theoretical Speed Rate: 3.34 mph/V (5.37 kmh/V)
Adjusted Vehicle Speed: 46 mph (74 km/h) - 7% loss
Calculated Loaded KV value: 2550
Calculated Motor Torque: 0.17 ft-lbs
Calculated Final Torque: 1.68 ft-lbs
Calculated Motor Power: 888 watts (1.2 HP)

You might see spikes of 90A or higher which will bring your HP to 2. Just find the right gearing that works for you and take down some nitro buggies .

Why isn't anyone using the 1515/1d ?

[nativepaul]

Because the 1515/1d has a High KV suitable for 6/7 cell or 2s but is too big and heavy for 1/10th scales and you would need a huge battery to utilise its current capability, the only use i see for it in cars is for speed record runs.

I also like the mega motors, i have 2x 16/15/3s, a 22/20/2, a 22/20/4, 2x 22/30/2, and 2x22/30/3, never had any problems with any of them, Lutach is right about the amp ratings if mega say its a 60A motor it can pull 60A all day long without getting too hot, if you but more load on it it will pull more amps without a problem, the 16/15/3 are rated at 30A and i was pulling about 45A continuous in an EDF plane for the 2.5 mins the battery lasted without an issue.

[lutach]

I sure hope Mega can drop the price on the 22/50s if they want to compete against Neu and the Castle version of motors.