Anyone else buy the cheap Sanyo-Deinki 1KW servos?

[KTP]

Hey, so I was looking at this Kollmorgen and it reminded me I have quite a few of the Sanyo-Deinki P5 brushless servo motors (meant for cnc mills and such). They are rated at 1KW continuous 140 volt or something IIRC. About 4 inch square by 10 inches long but they have a brake and encoder that could probably be removed. I think they are 8 pole too. I use one on my Shizuoka mill to move the 500 pound x-axis table and it can drive it at 1000IPM with high acceleration if I don't mind the 7000 pound mill dancing around the shop floor.

So....hmmm...I have a bunch of these because they were $39 brand new a few years ago at Surplus Center. I wonder how much power one could actually pull out of them with some cooling (they are brushless inrunner with alluminum housing, so easier to cool I guess) They probably could outperform the 400 watt kollmorgen by a bit?

Did any of you happen to get some of these when they were on sale? If so, have you ever though of using one on an ebike?

 

[Rayy]

I had one in my hands last week. I don't think it was a Sanyo-Deinki but it was about 4" dia and 10" long. The nameplate had 1.5kw continuous at 96V and 2.5kw peak. I think it was 6700rpm. At the time, I didn't have any quick ideas on how to use it on a bike. Did you have any ideas in mind?

 

[KTP]

For some reason I just think these more massive industrial servo motors should drastically outperform the RC outrunner motors...

The Sanyo Denki is rated at 1kW continuous at 100VRMS, but I am thinking perhaps one could actually pull a LOT more than that out of it with cooling and higher voltage...anyone up for a 50s2p battery pack?

Hmmm...I wonder since it is long but relatively small diameter, if you could just mount a rubber wheel to the shaft and drive the side of the rim in the same manner that rim brakes work. You could have a springy idler wheel on the other side of the rim to keep it pressed against the servo wheel...

 

[EVTodd]

I've actually seen some Sanyo servo motors in person myself within the last few months. I'm not sure if they were the same ones but it sounds like they were about the same size. They were heavy as hell if I remember right. I thought CNC machine rather than e-bike.

You can get outrunners dirt cheap too :wink:

 

[KTP]

I've actually seen some Sanyo servo motors in person myself within the last few months. I'm not sure if they were the same ones but it sounds like they were about the same size. They were heavy as hell if I remember right. I thought CNC machine rather than e-bike.

You can get outrunners dirt cheap too :wink:

Well there were a couple of things I was thinking about when looking at the industrial servos vs outrunners

1) the servo is heavier, but has more thermal mass and is inrunner, so you can cool it off much easier...also it might have more copper than the outrunner, ie, more torque.

2) the servo is quieter? The sanyo I use on my mill is extremely quiet at least. Outrunner sounds like cat getting strangled.

3) Longevity? The industrial servo uses oversized quality bearings and is made to run a 24 hour shift, 365 days a year. The outrunner was built for 15 min plane flights.

Anyway, perhaps the outrunner is better and the industrial servo is meant for cnc...I was just considering it since I have like 7 of them...

 

[EVTodd]

I've actually seen some Sanyo servo motors in person myself within the last few months. I'm not sure if they were the same ones but it sounds like they were about the same size. They were heavy as hell if I remember right. I thought CNC machine rather than e-bike.

You can get outrunners dirt cheap too :wink:

Well there were a couple of things I was thinking about when looking at the industrial servos vs outrunners

1) the servo is heavier, but has more thermal mass and is inrunner, so you can cool it off much easier...also it might have more copper than the outrunner, ie, more torque.

2) the servo is quieter? The sanyo I use on my mill is extremely quiet at least. Outrunner sounds like cat getting strangled.

3) Longevity? The industrial servo uses oversized quality bearings and is made to run a 24 hour shift, 365 days a year. The outrunner was built for 15 min plane flights.

Anyway, perhaps the outrunner is better and the industrial servo is meant for cnc...I was just considering it since I have like 7 of them...

I hear ya. It actually sounds like something I would try. My big thing is the weight issue but I'm not positive the ones I saw were the exact model. I would put the ones I'm talking about at 5 to 10 times heavier than an outrunner (estimated of course).

 

[Solcar]

Hmm, glad that I saw this thread since I just happened to see a neighbor who happened to put in a rare visit to his essentially abandoned house and he just happened to remember to bring the Sanyo-Deinki motor that I just happened to see on his Ebay listing and purchase about two years ago. Now i know about the mystery motor that his son handed to me and that I had forgotten about.

It didn't dawn on me, when I tried to turn the frozen shaft with my fingers, that the motor contained a brake before I hurriedly set it aside. There are loads of wires coming out of it, and now that makes all kinds of sense since I now know it is brushless instead of simply 60hz induction. It's pretty heavy, for sure, about equivalent in weight to a regular 24v brushed scooter motor.