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I bought a 220v 100w sewing machine motor to use it in a project Firstly I thought that the motor works only on ac (because there is 220v written on it) and just for try I gave it 30v dc and surprisingly it spined

1- Is that enough to know that this motor is a universal motor ?

2- If it is a universal motor what is the best way to power it to get full power with 220v dc ? Maybe a rectifier bridge ?

3- I don't want to work with ac voltage because it is hard to control (for me) and it needs triac trimming with zero cross detection to work with arduino so can i just use arduino and a mosfet to control the motor with 220v dc ? And what is the best mosfet for this thing?

Thank you all in advance

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    \$\begingroup\$ A rectifier does not create DC, but sine-pulsed DC, so you need to care for the zero-crossings in any case. \$\endgroup\$ – Janka May 20 at 0:10
  • \$\begingroup\$ Yes, it you want speed control you need to look for zero crossings, else if just on/off control use a TRIAC driver with built-in zero-cross detection. \$\endgroup\$ – Jasen May 20 at 3:06
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  1. Yes the fact that the motor works with DC applied pretty much proves that it is a universal motor. The only other possibility is that it is another type of DC motor such as a permanent-magnet DC motor with a commutator or a DC shunt motor. However those types of motors will not work on AC. If there is an indication that will work on either AC or DC, it can only be a universal motor.

  2. With 220V and a rectifier bridge, you can get a bit more than the rated speed and torque from a universal motor. Universal motors work sightly better with DC than with AC.

  3. For speed control of a universal motor, you can modulate rectified 220 VAC or a lower DC voltage using any appropriate DC switching device and PWM. A lower voltage will limit the maximum speed and power.

See also::

How does the power usage and voltage of a universal motor change when running on DC?

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