| Author |
Message |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 20
Registered: 10-2004
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| Posted on Monday, November 1, 2004 - 9:10 am: |
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No problem but first you need to advise your motor details such as voltage, nominal current, stall current if possible, motor power rating. |
Adam Wilks
Unregistered guest
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| Posted on Sunday, February 26, 2006 - 2:34 pm: |
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Which speed controllers in your current range would you recommend for controlling Bosch 750W motors? There are obviously a number of possibilities in the > 30A section but the price seems to rise drastically.
I was eyeing up a pair of 30A Electronize controllers for a current project and wondered if they might also cope with some Bosch motors in the future, perhaps limiting current?
Many thanks for your advice. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 140
Registered: 10-2004
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| Posted on Sunday, February 26, 2006 - 8:35 pm: |
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Adam,
Bosch 750W motors draw some 40A at nominal output but have a stall current of well over 150A. Naturally the current drawn depends on the load, if you reverse it & how quickly the motor is accelerated. On top of that is the motor inductance and its effect on reversing relay contacts. What we can say is that very few users have used Electronize speed controllers with the Bosch. Some have had limited success with using the external relay version but we cannot recommend any controller is the sub 30A range.
None of the Electronize range have current limiting, the only sub 30A model with this feature is limited to 20A so you will not get the performance out of the motor.
We would not recommend a motor greater than 150W with the Electronize range if used in applications with short acceleration times or rapid reversing.
The ideal controller for this motor is the 4QD VTX 75 which will help protect the motor and still deliver maximum performance. There is also the Roboteq as well but that is designed for two motors. We are not aware of anyone using the VTX 35 but with a motor load below its maximum duty might work. |
Rapide (Rapide)
Member
Username: Rapide
Post Number: 1
Registered: 3-2006
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| Posted on Monday, March 27, 2006 - 12:16 pm: |
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Hi, I have a 370watt 24v geared motor.
I need a controller to cover RPM range 0-300 ish and reverse if possible,
Can you please tell if your 24v is suitable?
and does this have everything needed - like potentiometer?
Thanks
Lyndon |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 151
Registered: 10-2004
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| Posted on Tuesday, March 28, 2006 - 10:05 pm: |
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Hi Rapide
Questions for you first:
1. What is the output RPM of your geared motor?
2. You refer to our 24v - what product are you refering to?
3. An assumption here is that you need a potentiometer control which limits the type of speed controller to a few. Is it possible to stall the motor? Do you require rapid change in direction?
My first choice for you would be the 4QD Vortex 24V 35A our part number 1511-021 hoping that I have understood your requirements correctly.
Paul |
Jamie McHarg (Ayrshirerobotics)
Member
Username: Ayrshirerobotics
Post Number: 1
Registered: 4-2006
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| Posted on Tuesday, April 18, 2006 - 12:00 am: |
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Hi Technobots,
I am building a featherweight robot for this year's UKRG and am wondering if you are able to advise on suitable speed controllers for it.
The robot is driven by four 9.6V cordless drill motors which will be overvolted to 12V. These are running 85mm diameter wheels.
I was looking at the following as possible solutions:
Item: 1502-001, 50V 5A H Bridge speedo
Item: 1500-020, Electronize 30A controller
Item: 1500-022, Electronize 30A (external relays)
Would any of these be suitable as a speed controller?
Would item 1502-001 be able to withstand four overvolted drill motors even though the main description only says 5A? (I'm on a budget and this seems a good price but I wouldn't want to risk frying the speedos)
Any advice would be much appreciated.
Many thanks,
Jamie |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 169
Registered: 10-2004
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| Posted on Wednesday, April 19, 2006 - 6:47 pm: |
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Welcome Jamie,
Drill motors are a continual problem as frequently their performance is unknown. They are typically designed for short term heavy use. They can draw significant currents and their stall current can be very high. When designing robots, it's best to size the speed controller based on the motor stall current as it can be this level of current seen when rapidy changing motor direction.
To size it properly, we need to know the stall current which is based on the internal resistance. Without this information, you will either have to take a gamble or over-size the controller. There are other factors that can be considered such as motor inductance that plays havic with relay change-over speedos.
The 1502-001 is a non-starter as I would not be surprised to see stall currents of 20 to 40A per motor. The 30A electronize with internal relay does suffer from relay failure due to motors with a high inductance. This leaves the 1502-022 with external relays which has been used successfully with many motors including drill motors. They also have the advantage of being able to replace the relay quickly.
However, without full motor details, we cannot be any more specific than this.
Regards
Paul |
David L Coombs
Unregistered guest
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| Posted on Tuesday, April 18, 2006 - 6:46 pm: |
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I am using the Como/FMA type 941D geared (4:1) motor to drive a 1:76 model steam locomotive, and wish to purchase a speed controller so that it will run under radio control. Space is LIMITED! I have allowed space for 2 banks of 5no 1.2v rechargeable batteries giving me a nominal 6v to run the 6v motor and the controller. The space left for the controller is approx 24mm x 18mm x 10mm. What controller is there available to suit that size? How adaptable are the DIY contollers to being physically re-ordered, if that is possible? Are there any speed controllers available for trains? (I have seen ONE such controller available at a website in Scotland, but that particular website/shop does not respond to my emails or letters, and it is the only one I have seen for trains) |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 171
Registered: 10-2004
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| Posted on Wednesday, April 19, 2006 - 7:14 pm: |
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David,
The 941D is a very small motor which is well within the capability of all of our speed controllers. The space left for the controller is rather small and this becomes the deciding factor as does the RC interface. Not sure what you mean by being able to re-order the DIY controllers?
Electronize do produce a train version of their controllers but these are physically too large for you.
Our smallest controller with RC input is 1503-004 but is still 36 x 36mm.
The size you have allowed is smaller than most radio receivers, the smallest speed controller we have is 23 x 11.5mm but does not have a RC input (only has a serial connection to microprocessors) so would require some fancy interfacing using say a PIC chip and some fancy programming.
You need to review the space you have, what size batteries are you using and what running time do you require?
Regards
Paul |
Donboon (Donboon)
Member
Username: Donboon
Post Number: 2
Registered: 4-2006
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| Posted on Friday, April 21, 2006 - 10:35 pm: |
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I'm disabled and want to build a special compact 4 wheel drive scooter. I see from your supplies that you have the components however I need help with the controller. If anyone has the time I'd like to discuss the spec and see what can be built. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 175
Registered: 10-2004
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| Posted on Monday, April 24, 2006 - 10:06 pm: |
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Hi Donboon,
You have not supplied an Email address to reply to but I'm sure we can help. If you wish to discuss in commercial confidence, Email our support address and we will see what we can do. |
AlwynHorler
Unregistered guest
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| Posted on Friday, April 28, 2006 - 1:45 pm: |
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I am starting to make a robot based on two standard 540 rc car motors - brushed. They are not special low turn windings but I will be fuse limiting their amps anyway. Is your Dual 50vH Bridge 1502-001 suitable for brushed motors?
I looked thro' the spec. but can see no direct reference. It might be inherent in it's components but I'm not that techie.
Thanks |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 176
Registered: 10-2004
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| Posted on Saturday, April 29, 2006 - 12:12 pm: |
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Hi,
As it happens, all of our speed controllers are suitable for brushed motors only (at the time of writing). Before we can recommend a speed controller, we need to know details about the motor. The 540 is available in at least three different voltage ratings which in turn dictate the current drawn by the motor. Our 5A 50V dual channel speed controller is unlikley to be suitable with motors rated at 7.2V but should be fine for 12V upwards.
Fuses are fine except that they take a finite time to blow which typically is far far longer than the semi-conductors (or even some PCB tracks) within a motor speed controller. However, we always recommend them as they should give protection to over loaded / stalled motors but not always to motors that short out. |
Andy Harley
Unregistered guest
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| Posted on Monday, June 12, 2006 - 9:42 pm: |
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Hi, I am looking for a speed controller to suit an electric pedal bike, The faulty unit is marked 250w 36v, would your 4QD VTX be suitable?Have you supplied one for this type of application before, If so was it successful?
Regards Andy. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 207
Registered: 10-2004
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| Posted on Tuesday, June 13, 2006 - 7:50 pm: |
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Andy,
The controller you mention is rated at only 7A which quite low. I assume you require a potentiometer input which does limit us slightly to the 4QD range and our H-Bridge range. Do you require reversing?
There are 2 choices if potentiometer input - 1. The MD03 and 2. the 4QD VTX 36V 35A. For your application I would strongly recommend the VTX as this controller is ideal for motorised vehicles for persons as it has adjustable acceleration / deceleration ramps, does not require an auxiliary supply for the electronics (unlike the MD03) and a number of other features incluing regen breaking, reversing, ignition switch etc. that make this an ideal controller for you.
Regards
Paul |
krunal
Unregistered guest
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| Posted on Wednesday, June 21, 2006 - 10:21 am: |
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Hi,
i m working on under water vehicle and i m looking for h-brige for out motor( 12A and 40V)
could pls sudggest me which h bridge i should use(i need smallest one, means it should be less specer)
if u have any h bridge near around 12Amp than pls mail me back as soon as yr conveniece
thanks
with regard |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 213
Registered: 10-2004
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| Posted on Wednesday, June 21, 2006 - 6:26 pm: |
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Hi,
When we refer to 'H' bridge controllers we mean those not using a reversing relay (not technically correct we know).
The best controller from our range for your application would be the MD03 (1502-010) as this offers 20A at up to 50V with a choice of interfaces. This controller or the MD22 have been used by other customers in their underwater vehicles.
Regards
Paul |
Markus Vadsten (Swedemac)
Member
Username: Swedemac
Post Number: 1
Registered: 7-2006
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| Posted on Monday, July 3, 2006 - 10:39 pm: |
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Hi Paul,
I'm building a 6 kg fightingbot (for the Finnish arenas) and have a few questions of what speedo to use.
My motors are 2 of LJ417 with attached RB35C-10 gearboxes. I have written the manufacturer (Douglas International Inc) because I'm having trouble in finding the specs. They haven't answered yet tho...
The thing is I may want to use the speedo in a 12 kg fighting robot later so a bit overspecced would be prefered but still small and light enough for 6 kg robot.
Other things I would like are:
- BEC to avoid additional batteries.
- Only 1 speedo to control the tanksteering bot if possible but 2 is ok if they are small enough.
- 6 to 24 volts if possible or 12-24 if not. I was hoping to use 12-24 volt Ni MH batteries from a decent powertool. Depends on what the motors can take.
+ Anything else useful you can think of  .
Also I may need a relay of some sort to activate a weapon...I'll probably use a LJ417+RB35C-10 motor for that too. But that is extra aside from the speedo.
Thank you...
Markus |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 229
Registered: 10-2004
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| Posted on Tuesday, July 4, 2006 - 9:12 pm: |
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Marcus
Without knowing the motor data we cannot be 100% sure. However the remaining criteria is met by the Electronize range. Subject to knowing the motor data, I would suggest a 1500-014 & a 1500-015 (1 of each) noting that the voltage range is 7-24V. You could use 2 off 1500-014 (no BEC) and operate down to 6V.
To operate a weapon, we have sold hundreds of the 2 way r/c relays see 3400-010 which will switch up to 10A but inductive loads like motors will reduce the life of the relay contacts. You could still use the on-board relay to drive a 30A automotive type relay such as our 1600-001 or you could use another speed controller such as the 1500-014 (personally I would carry a 1500-015 as a spare for all 3 controllers on the robot).
Regards
Paul |
Brian123
Unregistered guest
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| Posted on Thursday, August 17, 2006 - 7:38 pm: |
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Hi,
I need some advice on purchasing a speed controller and potentiometer, as I am building a toy car for my kids to drive around in.
The 12v electric motor is by EMD and has a 'July 89' label on it. It might be a 'PM50' as I believe it is from an electric wheelchair. 250w rating?
Can you advise on a suitable speed controller? I may add a second 12v battery and wire it for 24 power. I will be using an On/Off key ignition and a 3-way toggle switch to enable forward and reverse drive.
The potentiometer will be fitted under a foot operated accelerator pedal.
Any advice would be appreciated
Thanks. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 253
Registered: 10-2004
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| Posted on Monday, August 21, 2006 - 8:19 pm: |
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Hello Brian,
EMD motors are rather nice motors so no problem there. I cannot recall the nominal power input to the PM50 so let's assume 250W. You also need a pot input and reverse. The 4QD range would be ideal except for the possible need to change operating voltage. I would suggest the 4QD VTX 12V 35A our part number 1511-020. As for the pot, we can also supply a linear plunger type which you may find mechanically easier to install rather than a rotary type. |
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