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I want to drive 8 tiny diskmotors - they look like low current motors. robotshop 2mm vibrating disks

I want to drive perhaps 2 or three of them at a time with pulse-width modulation signals and I would like to do it from a single driver since they are uni-directional. This would assume the same pulse width for all activated motors. Assuming the current requirements are met by the driver;

Question: Can I drive them all from one circuit with a shift registers or with a multi-plexer. If so, how?

Is there a way to drive them with one motor driver that allows for variable pulse width as well?

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  • \$\begingroup\$ The motor linked in your question is not a BLDC motor. So please remove BLDC from the question title. \$\endgroup\$
    – gbulmer
    Jan 9, 2016 at 1:52

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Question: Can I drive them all from one circuit with a shift registers or with a multi-plexer.

Yes

If so, how?

Use MOSFETs to connect individual motors (complete with reverse polarity protection diode) to a "bus" voltage. The "bus" is the PWM switching power source. The 8 mosfets need 8 control signals and if you are low on GPIO then a shift register would work fine.

You might even be able to use one of these: -

enter image description here

It's got four high side and four low side mosfet drivers and runs from SPI control. I'm also sure you can get a MOSFET equivalent of the ULN2003 octal open-collector driver.

There's also the TPIC6C596 from TI: -

enter image description here

It's got a serial input line with 8x 250mA rated MOSFETs.

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  • \$\begingroup\$ Thank you! I would up vote but I can't \$\endgroup\$
    – daemondave
    Jan 8, 2016 at 17:28
  • \$\begingroup\$ You can "formally accept" any answer given but I'd wait a day or so and see if there are going to be better answers. Formally accepting is the symbol below the up-down arrows on my answer but please do wait a little while because accepting stuff too early discourages other answers. \$\endgroup\$
    – Andy aka
    Jan 8, 2016 at 17:42

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