If you are determined to use those motors, you have a few possibilities:
1. If your electronics is 24V-capable, then you should get reasonable performance out of them using a 24V supply.
2. Use half of each coil only, i.e. one end and the centre tap. The torque will be halved, but the inductance will be reduced by a factor of 4.
3. Take the motor apart. You will probably find that there are two wires going to each centre tap connection, in which case you can rewire them as bipolar-parallel.
4. Or just use them as they are, and upgrade to more suitable motors when you need higher speeds.
1. If your electronics is 24V-capable, then you should get reasonable performance out of them using a 24V supply.
2. Use half of each coil only, i.e. one end and the centre tap. The torque will be halved, but the inductance will be reduced by a factor of 4.
3. Take the motor apart. You will probably find that there are two wires going to each centre tap connection, in which case you can rewire them as bipolar-parallel.
4. Or just use them as they are, and upgrade to more suitable motors when you need higher speeds.