Archive through April 20, 2008

Author Message
Broadsman (Broadsman)
Member
Username: Broadsman

Post Number: 1
Registered: 1-2008
Posted on Monday, January 7, 2008 - 8:00 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi Paul,
Thank you for your advice on powering my hog roast.
Can you please advise me where I should look next.

regards,

Richard Minter.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 657
Registered: 10-2004
Posted on Tuesday, January 8, 2008 - 6:55 pm:    Edit Post    Move Post (Moderator/Admin Only)

Richard,

Did you particularly require a dc motor? How do you intend to attach the motor to the skewer shaft? Could you include further chain or gear reduction?

Regards

Paul
Broadsman (Broadsman)
Member
Username: Broadsman

Post Number: 2
Registered: 1-2008
Posted on Tuesday, January 8, 2008 - 8:59 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi Paul,
In answer to your resent email.
It does not necessarily have to be a DC motor but if it was I could run it off a leisure battery if there was no power supply nearby.
The motor would be attached to the skewer shaft via a coupling.
Yes I could incorporate a gear reduction or a chain drive.

regards,

Richard Minter.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 662
Registered: 10-2004
Posted on Wednesday, January 9, 2008 - 8:15 pm:    Edit Post    Move Post (Moderator/Admin Only)

Richard,

You could try our 3000:1 motor 1450-056 giving 5 rpm and power it via our voltage regulator 1062-005 (which will give you variable speed) as long as you protect the motor using a friction drive or a shear pin. A fuse may work but less certain with such a high reduction ratio. I still feel it is border line but not much else we can suggest.

Regards

Paul
levihosein
Unregistered guest
Posted on Monday, January 21, 2008 - 3:38 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,I'm a kingston uni. student and is involved in a project that automates the process of a roulette wheel.I have to drive the wheel and would like some advice on the type of motor that I could use to drive the system. As well as any electronic instruments/DEVICES.The Inertia of the wheel is 0.75 kg/m^2, Torque- 0.24 Nm, Power to drive - 1 WATT. The max speed is 25rpm. Also we would like to control the drive process using a chip.THANKS
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 677
Registered: 10-2004
Posted on Monday, January 21, 2008 - 7:16 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

We try not to give too much help to Uni Students as they should be researching this themselves! I would recommend you looking at our range of small geared motors although 1W power limit is not likely to be practical. Driving the motor with a 'chip' is rather vague to comment on, can you be more specific.
Saddledog (Saddledog)
Member
Username: Saddledog

Post Number: 1
Registered: 1-2008
Posted on Monday, January 21, 2008 - 4:11 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi I am looking for an electric motor to power a 2 person tricycle.
The weight I would estimate to be in the 250kg range. I would like to think I could get about 15mph, and a range of maby 10 miles.
Can you please suggest a sutable motor for this application, and also which speed controller I may need ( I don't need reverse) finaly what batteries I require.
Regards David
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 678
Registered: 10-2004
Posted on Monday, January 21, 2008 - 7:30 pm:    Edit Post    Move Post (Moderator/Admin Only)

David,

250kg & 15mph is quite challenging and then you have hills on top of that. I would suggest that 1HP may not be enough but two should be. Perhaps two of our Bosch 750W motors, one to each of the two wheels. A single 4QD Uni 8 speed controller is border line, you could use two, one for each motor as this also remians the lowest cost option. Batteries, lots of technologies around, cheapest being SLA. It is however, a difficult question to answer as the load is unknown. If we assume an average 40A load for 1 hour, you could be looking at 75Ah at 24V. All this changes if you assist with pedalling. You did not leave an Email address so we are unable to send you a personal reply.
mingzi.shi (Ms1004)
Member
Username: Ms1004

Post Number: 1
Registered: 2-2008
Posted on Tuesday, February 12, 2008 - 2:39 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi there,
could u give us any suggestions on motor/gearbox which could give 700 RPM with maximum power output of around 28 W , rated torque of 2.5 N.m . Variable speed is essential as well as the power output and the torque, as the system is driven at a variable speed. thx in advance!
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 715
Registered: 10-2004
Posted on Tuesday, February 12, 2008 - 3:28 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

Unfortunately it is not possible, to achieve a torque of 2.5N/m at 700 rpm would require an output power of about 183W which typically a motor of about 250W input power.
mingzi.shi (Ms1004)
Member
Username: Ms1004

Post Number: 2
Registered: 2-2008
Posted on Tuesday, February 12, 2008 - 4:21 pm:    Edit Post    Move Post (Moderator/Admin Only)

oh~yes u are right! what a silly number i hv put down there, my sketch book s such a mess. power = torque * rotational speed, which gives 183 W. in this case, which dc motor, gear box and voltage regulator do u recommend to choose to achive a variable speed down to 200ish RPM? thx!
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 718
Registered: 10-2004
Posted on Wednesday, February 13, 2008 - 8:53 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

We do not have a geared motor that wil give that output power at a speed of 700 rpm apart from teh currently unavailable 1471-121 although that is well over powered. Once you have a speed controller, you can reduce the speed to zero rpm. The nearest motors which offer the power and torque has a rpm of between 200 and 380 rpm, otherwise you will need to use one of our standrad motors with your own gearbox. Is the 700 rpm max speed absolute or will you consider something lower?
Chris Allen
Unregistered guest
Posted on Tuesday, February 26, 2008 - 11:40 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi, Firstly what a great site - i'm hoping to learn a lot!).
I am planning to build an electric 'mini bike' (like the 'sparky' on the Atomic Zombie extream machines website: www.atomiczombie.com).
This is a small bike capable of speeds around 20 mph (around 100kg total weight). My initial thoughts are using a single 24v 600W motor and suitable gearing for a top speed no more than approx 20mph. Also a speed controller suitable for use with a 'twist grip' type of control. Forward direction only.
Two 12v battery in series.
So my questions:
1. Does this set-up seem like a feasable solution?
2. What motor for this application could you recommend?
3. What type of controller?
4. Would the Twist Grip Throttle Complete - Part No: 1520-030 be ok to start/stop the bike?
5. What Ah batteries to use assuming I want to run for say 1 hr between charging?
6. Any other major electrical type items needed?

Sorry for all these questions but I've little electrical background but plenty of mechanical knowledge!

If you could answer my questions I would be most greatful and can hopefully make a start on building the bike and place some orders!

Any other useful information would be useful

Thanks very much in advance, Chris
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 730
Registered: 10-2004
Posted on Sunday, March 2, 2008 - 7:37 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi Chris,

Always nice to hear that our website is technically useful as well.

We only have limited experience of electric bikes but 600W for 100kg all up does sound okay. We know that a number of customers have used our Bosch 750W motor for bikes and scooters with good results. As you only need single direction, I would suggest the Uni series 8 (1514-824 or 1514-825) although a series 4 could just be okay as well. The throttle will vary the power from 0 to 100% but we do recommend using an ignition switch as well.

battery life is always difficult to estimate as the load is unknown but if we assume an average current draw of 25A, you would need over 44Ah of capacity. The Bosch motor is physically larger and is designed to run all day at 1HP, the 600W motor is physically smaller and more enclosed so may get hot if run under heavy load for excessive periods.

As for other electrical items, not really, just the usual cable, fuses, switches, maybe a battery monitor.

Regards

Paul
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 766
Registered: 10-2004
Posted on Wednesday, April 16, 2008 - 7:06 pm:    Edit Post    Move Post (Moderator/Admin Only)

From Mr Daghorn:

We are currently in the prototype stages and I am enquiring about the Belts and Motors you supply on your website.

I found the Timing Pulley 10T - Part No: 4605-010 and the Timing Belt 840mm - Part No: 4606-018 which is suitable for our requirements. Can you please specify which motor would be suitable for us? The job of the belt is to carry a small carriage 200 mm, back and forth, around 50 mm/s. There is a maximum of about 5kg being pulled by the motor.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 767
Registered: 10-2004
Posted on Wednesday, April 16, 2008 - 7:07 pm:    Edit Post    Move Post (Moderator/Admin Only)

Firstly apologies for the delay in replying.

Taking the force to pull as 5kg and the pulley diameter as 18mm, means you need 9kg/cm of torque. The speed of 50mm/s equates to about 1 rev/s or 53 rpm. I would suggest you look at our part number 1450-054 at 6V which offers 53 rpm at 17.5 kg/cm.
Alan Banks
Unregistered guest
Posted on Saturday, April 12, 2008 - 9:25 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,
My 4 year old grandson has a battery powered sit in Ferrari car bought for him 16 months ago.
It is 6 volt (12AmpHr SLA) powering a 540 size motor through a set of gears to one rear wheel. The controller consists of a reverser unit made up of a couple relays and some smd electronics. Go is just a switch operated by foot. It is very slow 2-3 mph. The boy's father has allowed the battery to go completely flat (now dead) and now the controller cuts out very easily.
I wish to make the car slightly faster eg 5mph. 12 volt.
I would be grateful if you could advise on
i. replacement motor that will fit 540 mount
ii. suitable controller
iii. throttle arrangement
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 768
Registered: 10-2004
Posted on Wednesday, April 16, 2008 - 7:20 pm:    Edit Post    Move Post (Moderator/Admin Only)

Alan,

540 size motors come in a variety of speeds so without knowing the wheel diameter and the gear ratio, it is impossible for us to advise a motor. As you require greater speed which almost certainly means more power and probably a larger motor. The 540 is about a 21W motor which is rather small for the car but the next size up we have is 80W but the fixing centres are 32mm compared to 25mm for the 540. The motor shaft is larger as well.
John Lannigan
Unregistered guest
Posted on Thursday, April 17, 2008 - 5:35 pm:    Edit Post    Move Post (Moderator/Admin Only)

I am currently modifying a Siclair C5 for 24 volt operation and have a target design speed of 32 MPH

The C5 currently has a 12 volt motor rated at 250 watts and a fixed design speed of 15 MPH
There are quite a few modifications available for the C5 to convert from 12 to 24 volts giving 500 watts or 2/3 HP performance.

I was looking at motor part number 1470-048 which is 600 watts, would this be an ideal replacement for the old sinclair motor (new mountings and gearing will be devised)

I couldnt clearly see what was mounted on the shaft but i would like to fit either a sprocket or a gear wheel, which would be the most effective form of transmission, with the least amount of drag or loss?

Regards
John
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 772
Registered: 10-2004
Posted on Sunday, April 20, 2008 - 8:10 pm:    Edit Post    Move Post (Moderator/Admin Only)

John,

Sorry but we do not have the Sinclair C5 motor specs available so cannot comment on RPM. There is every chance you could use this motor but from what I have heard, the C5 is a very nice motor so it's a shame to change it.

Our motor is supplied with a sprocket which can easily be removed. Most of our customers bore out their own gear or sprocket and use a grub screw arrangement to fix it to the motor shaft.

If the C5 motor is rated at 12V 250W, at 24V it will give 1000W, twice the speed and maybe 4 times the heat generated. So beware, this can lead to premature motor failure.