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Just bought a small DC motor speed controller (two LM324, two IRFZ44N, rated at 250W max output, input in range 5-10 to 30V DC) and started wondering how to synchronise six DVD-RW spindle motors (Nidec L16210A/18C293A160, nothing came from a google search). They have 6-pin flat cable but don't know which one returns the signal for rpm. And that's the problem - which solution (rdy kit or diy) can equal or balance their rpms in ±1-2% range? Seems it offers PWM regulation with choosable direction of rotation by jumpers (RIGHT on/off, LEFT on/off), done by B100K voltage regulator and a 35V 330µF capacitor

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    \$\begingroup\$ I strongly believe the DVD motors are BLDC. \$\endgroup\$ – Eugene Sh. Jul 6 '18 at 20:40
  • \$\begingroup\$ If your torque needs are low enough that you can run them open loop, you can actually just wire the two BLDC motors in parallel and sequence them like a sort of 3-wire stepper motor. But for meaningful torque you'd need two closed loop position-sending BLDC drivers either seeking a setpoint RPM or somehow coordinated with each other. In theory you can even get them rotationally locked. \$\endgroup\$ – Chris Stratton Jul 6 '18 at 20:48
  • \$\begingroup\$ in theory … in practice, it's much much easier to use a rubber belt and fake the secondary spindle, given the small torque. \$\endgroup\$ – Janka Jul 6 '18 at 21:06
  • \$\begingroup\$ In fact that's my idea to NOT use belt synchronisation due to different levels of slipperiness at each belt pulley \$\endgroup\$ – 1000Gbps Jul 6 '18 at 21:13
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    \$\begingroup\$ But you want to allow 2% speed derivation? Belts get it near to zero. \$\endgroup\$ – Janka Jul 6 '18 at 21:20

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