Specifications

DS - 6 Design Ver. 0002
DS.2 SPINDLE MOTOR AND SERVO DRIVE
On the spindles of machine tools, it is important to maintain a constant turning speed of the
spindle. To control this speed, the drive applies torque to the load according to the
characteristics of this load as well as to the adjusted accelerations and decelerations.
Procedure to calculated the needed motor power.
1. Depending on the characteristics of the load, determine the rated values of the needed
power (in continuous cycle, instantly and periodically).
2. Increase the value of that needed power, considering the efficiency of the power
transmission and load dispersion.
3. Select the drive that offers the current needed to govern the motor in all duty cycles for
that machine.
DS.2.1 POWER DEMANDED FROM A MOTOR FOR A PARTICULAR
LOAD
To determine the needed motor power, use the following formula:
P
MOTOR
> P
LOAD
+ P
ACCELERATION/DECELERATION
Motor power ≥ (Power required by a load) +
(Power required for the Accelerations/Decelerations of the Machine)
Torque
Speed
Power
Nb
Load type:
Constant power, regardless of speed.
Examples: Constant tension coils, Mill spindle, Lathe spindle
Torque/speed
characteristics:
The torque decreases from base speed on
Motor power:
Rated drive power will be the one demanded by the load.