What kind of affordable controller/ drivers can I use with these motors and why are the voltages so high

I'm very new at these.

PACIFIC SCIENTIFIC NEMA 34 STEPPER MOTORS

MODEL = E31NRLC-LSS-NS-05

MOTOR LENGTH IS = 2.61 INCHES

MOTOR SHAFT DIAMETER = 0.376 INCHES

MOTOR SHAFT LENGTH = 0.95 INCHES

HOLDING TORQUE = 350 OZ-IN

Vs(dc = 170 V(DC)

Ls(dc) = 1.48 A BIPOLAR SERIES

Po = 124 W