Specifications

AP - 34 Applications Ver. 0002

AP.6 SPINDLE MOTORS AT LOW RPM

In some cases, it would interesting to avoid the gear box on the machine spindle. That

requires a drive offering constant power at low speed.

This motor behavior may be achieved by limiting its power.

The next example shows how to do it:

A motor is to be installed on a machine offering 5 kW in S1 for speeds over 500 rpm.

Solution:

The SPM132L motor offers a rated power of 15 kW in S1 and 22 kW in S6-40%. Its base

speed (from which it really offers that power) is 1500 rpm.

By limiting its maximum power to a third of its capability, the effective base speed will be

reduced to one third, that is 500 rpm.

This effect is controlled by means of parameter MP22 (Fagor access level).

Important:

The power limitation at the motor does not imply the possibility of controlling it by a

smaller drive.

However, the power demanded to the Power Supply will be smaller.

2000

speed (rpm)

power (kw)

S6-40%

SPM 132L .1

1000 4000 6000 8000

2.75 Drive

3.100 Drive

MOTOR SPM132L .1

POWER/SPEED CHARACTERISTIC MP22 = 100