[jmelson]

Hello,

I got a Panasonic Minas S series motor from a friend, and have just gotten it running with my brushless drive and controller. This motor has the commutation signals (sometimes called Hall signals) turned into a serial bit stream on one differential pair, so I had to come up with a decoder for it. Once I had that figured out, I tried it with my brushless servo amp and it works VERY well, and is smoother than any other brushless motor I have tried so far. This particular motor is the Panasonic MUMS042A1A, but I suspect this decoder will work with all the motors from that series.
I am trying to gauge the interest in bringing this out as a product. I think a bunch of these motors were sold on the surplus market about 2007 - I should have bought some then!

Jon

[jmelson]

I have now tested this scheme with the larger MUMS082A1A motor (800 W) and it also works very well. I definitely want to bring this out as a product, but would like to hear from people who have some of these motors.

Jon

[jalessi]

Jon,

Would you happen to have wiring diagram for Panasonic AMK8200810LAK

100 VOLT 200WATT .637 nM AC SERVO

Jeff...

[jmelson]

Jon,

Would you happen to have wiring diagram for Panasonic AMK8200810LAK

100 VOLT 200WATT .637 nM AC SERVO

Jeff...

Is this a motor drive? I looked through all their servo motor listings and it seems all their motors start with the letter "M".

Jon

[jalessi]

Jon,

I am guessing it is a OEM number.

For sure it is AC servo motor, the data I posted is off the label.

Will post more info as soon as its available.

Thank You

Jeff...

[jmelson]

Jon,

I am guessing it is a OEM number.

For sure it is AC servo motor, the data I posted is off the label.

Will post more info as soon as its available.

Thank You

Jeff...

OK, I saw somebody is selling these on eBay. They mention clean room compatible, so these may be specials for that market. I can tell the connectors are different than the Minas S series motors I have gotten working.

If you already have some of these motors, you could send me one and I'll figure it out if at all possible. I'd guess it is very likely they use the same scheme of encoding the commutation signals as the Minas S motors.

If you do find a page that describes the encoder connections, let me know.

Jon

[coolfox]

Jmelson
Did you find any other info like motor identification encapsulated in Panasonic Minas communication code ? Mitsubishi have this motor identification in in the Melservo range with difficult to overcome ( I found the way through setting) but then sorted allow use motors and amplifiers across the range!
Can you please share minas communication code with society?
I will do my best to share any findings on this path too.

[jmelson]

The MUMS - series motors only has commutation info, nothing else. The Minas may be a later generation. The scheme on the MUMS motors
was just a serial stream of bytes, exactly identical to computer serial communication, which had the true and then the complement
of the 3 Hall signals in the first 6 bits of the 8-bit byte. VERY simple to understand.

Jon

[coolfox]

Jon
Thanks for answer I did look on stream and it does look like 1 start bit + 8 data bits + 1 stop bit per byte = 10 bits per byte? Indeed like serial RS232 one way! I wonder if there is the way to real time decoding it without micro microcontroller Im not strong on discrete logic designs :-) ?
Thanks
Ilia

[jmelson]

I don't remember the exact format, but 10 bits total sounds right. I make a converter board to do this. It generates the classic Hall
signals. See Pico Systems : Panasonic Encoder Converter [PANASONIC] - $100.00 for more info.

Jon

[gm276]

Jon, I seem to be in the reverse situation. I have three panasonic MUDS drives but no matching MUMS motors. I read the previous post with interest as I attempted to gather any info I could on
this serial commutation data. I was planning on taking the motor I had which has hall outputs and feeding a uart type device to get the required signal. Right now I get an encoder error on the
drive which I am assuming is the missing signal (RX). Just a hobbyist other wise it would be time just to buy some other drives.
Don B

[jmelson]

It has been quite some time since I did this, so my memory is a bit vague. But, looking at the code I wrote, it appears the data
is at 1 Mbit/second, and I think the first 3 bits are the Hall signals, and the next 3 are the complement of the Hall signals.

Jon

[gm276]

I hooked up a usb converter that can do 1M serial. Sent the output to a 75als191 differential driver and tried to feed the REC leads on the panasonic drive. . still get encoder error.
Out of ideas. Perhaps my inter character time is too long. I was sending and ascii ctl-g or a "c" to simulate the commutation signal.
Anyone actually know what the Pansonic drive wants to make it self happy?

[jmelson]

I hooked up a usb converter that can do 1M serial. Sent the output to a 75als191 differential driver and tried to feed the REC leads on the panasonic drive. . still get encoder error.
Out of ideas. Perhaps my inter character time is too long. I was sending and ascii ctl-g or a "c" to simulate the commutation signal.
Anyone actually know what the Pansonic drive wants to make it self happy?

I'm a little vague on this, but my recollection is that the first 3 bits are the 3 commutation signals, then the next 3 bits are the
complement of those signals. I don't recall, but I don't remember that there was any parity bit on this. I think it
was an 8 bit byte with probably 2 stop bits. if this isn't enough to get you going, I could scope it out, as I use
a MUMS motor to test my converters.

Jon

[gm276]

Jon,
I would love to know what the MUMS puts out. I wonder what the differential voltage needs to be (now putting out 0 volt and 5 volt). Parity or not. Least significant bit sent first?
Inter character time? Thanks for any of your info.
Don B in pa

[jmelson]

Jon,
I would love to know what the MUMS puts out. I wonder what the differential voltage needs to be (now putting out 0 volt and 5 volt). Parity or not. Least significant bit sent first?
Inter character time? Thanks for any of your info.
Don B in pa

OK, I'll try to get a scope on it this weekend. It is 5 V differential, as in 26LS31 / 26LS32 type drivers.

Jon

[gm276]

Jon, I think I have it.
After a bit of head scratching and some time with the scope.
bits 1 2 and 3 are the hall states. bits 4 5 and 6 are the complements of the hall state but in reverse order.
bit 7 is set and tells if there are one or two hall state on. bit 7 set to 1 if two hall states at once.
the bit rate as you said, 1 megahertz. The character rate 83k.
Thats what I see with the scope.
Regards,
Don B

[jmelson]

Glad you were able to figure this out! I didn't know about the reverse order of the complement bits, I didn't use those
in the converter I made. I'm guessing bit 7 is a parity bit.

Have you gotten something to work with your drives, yet?

Jon

[gm276]

Jon,
No, starting to think the drives are bad. ERROR 22
I am waiting for some connectors but I did hook up the output of the rx leads from the mums motor and still the error persisted.
I will try once more with some better cables.
Don B

[jmelson]

Well, are you sure the drive supports the motor you are trying to connect? I've never worked with the Panasonic
drives, I just got some motors cheap on eBay quite some years ago. I make my own brushless drive system.

Jon