Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual de usuario descargar pdf (Pagina 165)

Reference

10-3

The following graph illustrates a typical speed-torque curve for a

NEMA Design B induction motor. An understanding of several

points on this curve will aid in properly applying motors.

Figure 10.2 Speed Torque Curv

Locked-Rotor Torque (LRT)

Locked-rotor torque is the torque which the motor will develop at rest

for all angular positions of the rotor, with rated voltage at rated

frequency applied. It is sometimes known as “starting torque” and is

usually measured as a percentage of full-load torque.

Pull-Up Torque (PUT)

Pull-up torque of an induction motor is the minimum torqu

developed during the period of acceleration from locked rotor to the

speed at which breakdown torque occurs. For motors that do not have

definite breakdown torque (such as NEMA Design D), pull-up torque

is the minimum torque developed, up to rated full-load speed, and is

usually expressed as a percentage of full-load torque.

Breakdown Torque (BT)

The breakdown torque of an induction motor is the maximum torque

the motor will develop with rated voltage applied, at rated frequency,

without an abrupt drop in speed. Breakdown torque is usually

expressed as a percentage of full-load torque.

Full

Load

Torque

Pull Up Torque - PUT

Locked Rotor Torque - LRT

Breakdown Torque - BT

Synchronous Speed

Slip

Full Load Torque - FLT

Full Speed

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 201 202

Sin comentarios

Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual de usuario Pagina 165