Replacing a Brushed Motor with a Brushless Motor - Advice needed. - diyAudio
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Old 19th July 2015, 05:35 PM   #1
Salar is offline Salar  Germany
diyAudio Member
Join Date: Feb 2006
Location: Germany
Default Replacing a Brushed Motor with a Brushless Motor - Advice needed.

In many, many traverse mechanisms, this motor is used as a spindle motor:


Used in Sony, Philips, Sanyo Mechanisms.

A cheapo, i. e not suitable for heavy clamps. At least not durable
for decades. (For years, yes)

As far as i know, brushless motors are more reliable and sturdy. Never seen one with shafts thinner than 3mm. They were always the first
choice in first CD-Players and also first generation ROM drives before the companies cut corners.

Replacing a brushed motor with a brushless is not an easy task.
But I would like to give it a try.
As far as I know, in the world of RC-Cars and planes, there are voltage to PWM converters for doing this.

I am good in milling, soldering and buying parts - but very, very bad in designing.

Anone who can help me in designing a converter?

I assume, this mod will be very versatile and could be used in many players, if a small brushless motor (at least in diameter) can be found.
Maybe the Shigaclone guys could also benefit from this...

All the best,
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Old 19th July 2015, 06:01 PM   #2
diyAudio Member
Join Date: Nov 2005
If I were to do this I would probably design a linear, sine wave three phase driver. Nothing plucked from the RC field will be like that. Since you're looking at very low output power the loss would hardly be significant, while the noise reduction may be. On the flip side, a better motor is probably a lot easier, even if it had brushes or self contained electronic commutation. If you can machine yourself then shaft size is not too big of a problem. You will probably have to entirely re-tune the servo if the dynamic performance of the new motor is much different, which is probably more complicated than you want. You'd also like a motor with very low torque ripple, like a coreless rotor type or something. Just using a wimpy motor sort of helps that automatically. A lot of CDROM drives use comparitively beefy 3PH brushless spindle motors.

Last edited by Andrew Eckhardt; 19th July 2015 at 06:20 PM.
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Old 21st July 2015, 03:47 PM   #3
Salar is offline Salar  Germany
diyAudio Member
Join Date: Feb 2006
Location: Germany
I found this thread @ diyaudio. There is a solution for Philips mechanisms:

BLDC motor upgrade board for CDM9/CDM12 transport or CD player
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Old 21st July 2015, 04:22 PM   #4
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Location: Victoria,TX
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I just finished replacing the worn out motor of my Garrard 35 and it is in a beta test right now. After tried some different motors I decided to see if I can replace it using a stepper motor and a micro. I am using a reflecting sensor, a small reflecting metal strip glued to the platen as a marker and an stepper motor. Used the micro to read the index marker every time the platen do a revolution and calculate the rpm of the platen and display it. Mounting it a bracket used to mount a camera in a Drone Helicopter. I used it to eliminated any vibration coming from the stepper motor. At beginning since the spindle was about 1/4 inches the stepper motor was whining due the high frequency 1000 kHz. Replacing the spindle with a larger pulley I was able to dropped the frequency to 622 KHZ and the whining when away. Now the system it is running very good and it is easy to implement it in any turntable. Attached are some pictures showing the implementation. The only problem it is that you need to know how to program the micro. The software it is in basic using the Zbasic micro. Total cost of the project it is about $75 dollars.
Attached Images
File Type: jpg 2015_0418J10_camara_picture0001.JPG (196.6 KB, 40 views)
File Type: jpg 2015_0418J10_camara_picture0005.JPG (204.1 KB, 40 views)
File Type: jpg 2015_0418J10_camara_picture0006.JPG (202.8 KB, 40 views)
File Type: jpg 2015_0418J10_camara_picture0007.JPG (187.0 KB, 39 views)
File Type: jpg 2015_0418J10_camara_picture0008.JPG (202.3 KB, 40 views)
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Old 26th July 2015, 10:52 AM   #5
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Join Date: Oct 2007
thorens TD125 uses a brushless motor, with sinewave drive, schematics can be found on the web, or on threaads on diyaudio
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