motor upgrade

[myzter]

Im looking to upgrade my DC brushed electric motor.
- Currently Im running a 24V 350 watt 2600 RPM (Currie Technologies)
- while also gearing down 2T from 11T @ 55T ///to : 9T @ 55T

I want to gear down like this to keep watts draw below 250 watts, while still having good torque at low speeds
- tires are 200mm X 50mm //

the motors Im looking at are:

36 Volt 750 Watt : $113
http://www.monsterscooterparts.com/36v-750w-motor-11tooth-currie.html

24 Volt 900 Watt - 2600 RPM : $124
http://www.monsterscooterparts.com/24-volt-900-watt-electric-motor-11-tooth-chain-sprocket.html

600W Motor - 36 Volts - 2600 RPM : $90
http://cgi.ebay.com/NEW-600W-Motor-36-Volts-Style-XYD-13A-/330390699759

My controller is only rated 24V @ 30 A / Rated Motor 350 - 750 Watts
which fits my 350 motor great..

Except, I have 2 small capacity booster packs on my ride.
- 4s1p A123, and a 10 volt - 350 F capacitor bank
Setup on 2x SPDT switches / inline with the controller output. (direct to motor connection)

I only use the boosters at times for very short bursts .. 2-5 seconds to get up to speed..
My watt meter is connected directly before the motor, and shows I pull upwards of 1100 watts (never reaching over 38 amps)

---
so.. here it is..
I want to keep my top speed the same or higher as my 350 watt 24V motor with 11T @ 55T setup
- overvolted to 36V

BUT also geared down to 9T (motor) @ 55T (wheel)


I could describe more and more, does anyone get this ???

 

[neptronix]

Major problem with your plan: electric use more power at low RPM than they do at high. So you put a bigger motor on there, and gear it down.... well, you're gonna have a massive top speed, and massive amp draw for a very long time.

This would seem to be the opposite of what you want.

Also, those scooter motors don't have transmissions like your currie bike has. You'll need a gear reduction unit with those.

If you want a more efficient setup, you will need to ditch those brushless motors and get a DD or geared hub.

 

[ev_nred]

dont go with monster scoter parts.... there riping you off!
tnc scooters sells the same motors for much cheaper!
also do not go hub motor on this one they way a ton!
cheers,
jacob R

 

[myzter]

neptronix: dropping the motor sprocket teeth from 11T down to 9T is gearing down or gearing up ???
- anyways that is my plan... Less amp draw while accelerating, and cruising at 24 volts No hub motor here guys..
The price is not a concern... having the right motor for the job is my concern.

Why should I choose the higher voltage rated motor .. if:
I want the least amps draw when accelerating upto 24 volts, and Im overvolting to 36v+ for the top speed...

24 Volt 900 Watt - 2600 RPM / 34 amps
600W Motor - 36 Volts - 2600 RPM / 36 amps

- The project goal is to have a top speed similair to an electric wheelchair under the 24V controller/motor, using a 9T - 55T geared drive / with very low amps draw - sub 250 watts
- I should have copious amounts of torque... right ?? for a 40 lbs vehicle and 140 lbs rider

Add a booster pack or three (12v -19V - 26V) and now speed is possible
- more efficient acceleration, as most of the juice is directly from the booster packs and not passing through an 95% efficient controller.

 

[frankie]

900 watt 24 volt 11 tooth motor, Two 24 volt 9ah batteries wired together for 24 volt 18 ah, no controller or gearing. Momentary toggle to apply power.
????????????????
I might add, that I did this with my 450 watt bicycle. One to many dead stop starts messed things up. Believe rider should be pedaling before hitting switch. Note: My bike really moved.