GoldenMotor.com Forum

General Category => General Discussions => Topic started by: NoRegrets on September 20, 2009, 02:18:58 PM

Title: any low-speed gearless hub motor?
Post by: NoRegrets on September 20, 2009, 02:18:58 PM

I have a 24V 250W mini-hub motor that I am currently using as a pedal generator.  It performs well but the gear train makes it a little noisy.

Does Golden Motor (or anyone else) might make a brushless AND gearless bicycle hub motor that would produce about 15V at low (~250 RPM).  Thanks.

Title: Re: any low-speed gearless hub motor?
Post by: Bikemad on September 21, 2009, 11:31:05 AM

(http://www.goldenmotor.com/hubmotors/hubmotor-imgs/Rear%20Hub%20Motor%20-%20HBS36R.gif)
 Click the (http://goldenmotor.com/ItemBar%20Hub%20Motor.gif) tab on the GM site for further details. (http://goldenmotor.com)

I would say that the 36V 500W HBS36R Rear Hub Motor should be suitable for your needs, but you will need a rectifier and a suitable voltage regulator to limit the maximum voltage.

You might also want to take a look at this post. (http://goldenmotor.com/SMF/index.php?topic=1209.msg6104#msg6104)

If it's going to be used without a rim, I would suggest fitting some sort of flywheel to give a more even speed for pedalling, otherwise it could slow up too much at the end of each pedal stroke, making it very difficult to pedal.

Alan
 

Title: Re: any low-speed gearless hub motor?
Post by: Perbear on September 22, 2009, 12:29:17 PM

I have seen a geared rear hub motor with helical gears on the motor. The three planet gears (plastic) consists of two gears. One that fits the helical gear on the motor spindle, and a regular spur gear that fits the internal  sprocket ring gear. This construction is very silent. It is not possible to hear noise from the gears while riding the bike. I do not know who makes the motor but it is larger and probably heavier than the GM minimotor.

Title: Re: any low-speed gearless hub motor?
Post by: ccbreder on September 22, 2009, 03:23:01 PM

Alen has the right idea. Perbear is referring to Heinzman. They are hard to find in the US. Gears just add to the resistance on a generator.

Title: Re: any low-speed gearless hub motor?
Post by: Perbear on September 25, 2009, 12:26:55 PM

Quote from: ccbreder on September 22, 2009, 03:23:01 PM

Alen has the right idea. Perbear is referring to Heinzman. They are hard to find in the US. Gears just add to the resistance on a generator.

No, the motor I saw was definitely not Heinzmann. They use a brushed motor with a fixed gear: https://endless-sphere.com/forums/viewtopic.php?f=2&t=4190 (https://endless-sphere.com/forums/viewtopic.php?f=2&t=4190)

The motor I saw (and partially disassembled) had planetary gearing. A typical planetary gearing has energy loss of 3% but to find the exact efficiency you need to do a calculation like this: http://www.roymech.co.uk/Useful_Tables/Drive/Gear_Efficiency.html (http://www.roymech.co.uk/Useful_Tables/Drive/Gear_Efficiency.html)

Title: Re: any low-speed gearless hub motor?
Post by: ccbreder on September 30, 2009, 02:46:59 PM

https://endless-sphere.com/forums/viewtopic.php?f=3&t=4892