Originally Posted by
strostkovy
I have found that Nema 34 motors tend to be very lacking in power, because of the high inductance. To use them properly IMO they need to be driven with several hundred volts. Otherwise a typical Nema 23 with a belt reduction will outperform them in both speed and torque.
Directly AC powered drivers are available and affordable and can push nearly 300V and on paper that gives excellent performance. The motors are *typically* rated for over 500 volts isolation, often much more, but ground them properly if using these voltages.