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  #11  
Old 07-03-2012, 06:25 PM
SimonRafferty SimonRafferty is offline
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Default Re: Is There cheap BLDC Controler?

While I was trying to reverse engineer my Siemens AC drive, I designed & built a prototype vector phase controller for the Siemens AC motor. I only tried it small scale with a 1kw 3 phase fan motor but it would scale.

I succeeded in getting the Siemens drive to work, so abandoned the backup project.

It strikes me that a BLDC motor is fairly similar and wouldn't be hard to scratch build a controller for.

Can you tell me where one can buy a good value, say 100Hp BLDC?

Does your motor have an encoder for the shaft position or does the controller rely on measuring the back emf to gauge the rotor angle?

Si
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  #12  
Old 07-04-2012, 01:19 AM
Genius Pooh Genius Pooh is offline
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Default Re: Is There cheap BLDC Controler?

Quote:
Originally Posted by SimonRafferty View Post
While I was trying to reverse engineer my Siemens AC drive, I designed & built a prototype vector phase controller for the Siemens AC motor. I only tried it small scale with a 1kw 3 phase fan motor but it would scale.

I succeeded in getting the Siemens drive to work, so abandoned the backup project.

It strikes me that a BLDC motor is fairly similar and wouldn't be hard to scratch build a controller for.

Can you tell me where one can buy a good value, say 100Hp BLDC?

Does your motor have an encoder for the shaft position or does the controller rely on measuring the back emf to gauge the rotor angle?

Si
hi It's remy's 250 bldc motor you can easily find it in this forum...

Currently I do some trial in court so I don't have enough time and money but I can surely make 1200 hp EV car If there is good controller...hohohooh...It's Pooh's dream
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  #13  
Old 07-04-2012, 01:57 PM
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Elithion Elithion is offline
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Default Re: Is There cheap BLDC Controler?

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Originally Posted by Genius Pooh View Post
Is There cheap BLDC Controler?
Here is a more or less complete list of all motor drivers suitable for EVs. This is the AC section . The "BLDC" column has a check mark for motor drivers for BLDC motors: Kelly, Navitas and Rinehart.
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Last edited by Elithion; 07-05-2012 at 12:04 PM.
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  #14  
Old 07-05-2012, 12:22 AM
Arlo Arlo is offline
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Default Re: Is There cheap BLDC Controler?

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Originally Posted by Elithion View Post
Here is a more or less complete list of all motor drivers suitable for EVs. This is the BLDC section: Kelly and Navitas.
Thats page has a lot of mis information. BLDC can be trapazoid or sinus and a lot of the AC induction inverters work with BLDC as well.
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  #15  
Old 07-05-2012, 08:34 AM
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Default Re: Is There cheap BLDC Controler?

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[That] page has a lot of [misinformation]. BLDC can be [trapezoidal] or [sinusoidal] and a lot of the AC induction inverters work with BLDC as well.
I sympathize with the confusion: the difference between BLDC (trapezoidal) and BLAC (sinusoidal) motors is unclear to many people.

I believe you when you say that some have had success running a BLDC motor with a sinusoidal wave instead of a trapezoidal wave. The motor efficiency would suffer, and the rotation would not be as smooth, but, yes, the motor would still rotate.

I have corrected the wording in that page, based on your comment, to clarify the issue; thank you.
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Last edited by Elithion; 07-05-2012 at 09:12 AM.
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  #16  
Old 07-05-2012, 08:44 AM
Arlo Arlo is offline
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Default Re: Is There cheap BLDC Controler?

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Originally Posted by Elithion View Post
I sympathize with the confusion: the difference between BLDC (trapezoidal) and BLAC (sinusoidal) motors is unclear to many people.

I believe you when you say that some have had success running BLDC motor with a sinusoidal wave instead of a trapezoidal wave. The motor efficiency would suffer, and the rotation would not be as smooth, but, yes, the motor would still rotate.

I will add some words to that page, based on your comment, to clarify the issue; thank you.
The wave form from a BLDC motor depends on the mechanical structure of the motor and things like magnet numbers stator tooth size and shape and winding patterns and factors. BLDC can produce and need a TRAPEZOID wave form it just depends on how it was built. All of them should just be classed as PMAC motors to make things more clear. And if you feed a trap wave to a motor with a sinus wave it can make more power but if you feed a sinus wave to a trap motor it will likely make less power. MY controller I'm working on can basically make both waves. What it does is produces a sinus wave but you can up the out put to introduce clipping which will end up a trap waveform.
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  #17  
Old 07-05-2012, 09:13 AM
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Default Re: Is There cheap BLDC Controler?

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My controller I'm working on can basically make both waves.
Please let me know when it's commercially available, and I will add it to that list.

Quote:
Originally Posted by Arlo View Post
All of them should just be classed as PMAC motors to make things more clear.
I have added that term to the Classification of electric motors page; thank you.
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Last edited by Elithion; 07-05-2012 at 09:18 AM.
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  #18  
Old 07-05-2012, 09:17 AM
Arlo Arlo is offline
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Default Re: Is There cheap BLDC Controler?

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Originally Posted by Elithion View Post
Please let me know when it's commercially available, and I will add it to that list.
IM not sure if thats going to happen. We have a few controller projects on endless sphere forms. But If I do plan a comercial build I will let you know.

There is about 2-5 more I can think of you have not put on the list.
Tantum wave sculpter.
Rhinhert makes a BlDC controller
Sevcon makes some BLDC options
Lots of china controllers (cheep but lack proper controll fetures)

I will add more when i have time to search them all again.
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  #19  
Old 07-05-2012, 10:47 AM
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Elithion Elithion is offline
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Default Re: Is There cheap BLDC Controler?

Quote:
Originally Posted by Arlo View Post
Tantum wave sculpter
I think you mean the Tritium WaveSculptor; it's there. Look under 'T' in the AC motor section.

Quote:
Originally Posted by Arlo View Post
Rhinhert makes a BlDC controller
I had it under AC inverter, but I now included it as both an AC inverter and a BLDC driver. Thanks.

Quote:
Originally Posted by Arlo View Post
Sevcon makes some BLDC options
Which ones, please?
"Your search - site:http://www.sevcon.com/ "BLDC" - did not match any documents. " They must call it something else.

I do appreciate your feedback: keep it coming! Thanks!
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  #20  
Old 07-19-2012, 08:47 AM
ruckus ruckus is offline
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Default Re: Is There cheap BLDC Controler?

The Scott Drive is now available and should be added to the list. The first several units are currently in service powering EV's in New Zealand. I am coordinating a group buy to bring the first batch to the U.S. for testing in the next few months.

The Scott Drive 100 is a nominal 400v, 400A for ~160kw max (gross). ~$3000
The Scott Drive 200 is a nominal 400v, 600A for ~240kw max (gross). ~$3600
The Scott Drive 300 is a nominal ~600V, 600A for ~360kw max (gross). ~$?? The 300 is still in the engineering/prototype stage.

I would link you to the pdf on the Greenstage website (they are a dealer in NZ), but then I would be accused of breaking forum rules. I am not selling these controllers, but am interested in testing them.

Cheers
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