Technical data. Torque-Speed curves. Fagor CNC 8070 para otras aplicaciones, CNC 8037 para fresadoras, CNC 8065 for lathes, CNC 8055 para otras aplicaciones, CNC 8055 for lathes, CNC 8065 para fresadoras, CNC 8060 for lathes, CNC 8037 para tornos, CNC 8065 for milling machines, CNC 8055 para fresadoras

2.9

   3-phase servomotors. FXM

Technical data. Torque-Speed curves

The following sections provide the main technical data of each model and their torque-speed graphs for servomotors with A winding (400 Vac) and F winding (220 Vac). Here are also the tables associating the servomotor model with the FAGOR drives that can govern it. Bear in mind that selecting the drive to govern a particular servomotor depends on the requirements of the application; in other words, on the peak torque that may be demanded from the servomotor for brief instants.

Hence, if the servomotor duty cycle in the application were the rated value all the time, it would be enough to select a drive that can provide this torque. However, applications with this kind of behavior are rare. In general, there is always an instant that requires increasing the torque beyond the rated value (e.g. for a rapid tool positioning in G00 when machining) and, consequently, the peak torque must be higher than the rated (nominal) torque.

Drive selection. General criterion

The tables shown later on provide the possible servomotor-drive combinations. It has been assumed as general criterion to demand a peak torque (Mp) that the drive must provide that is 2 or 3 times the stall torque of the servomotor it is going to govern. See that this value is given in the tables by the Mp/Mo ratio.

Observe that servomotor-drive combinations whose ratio is lower than 2 have been left out although, as mentioned earlier, there could be applications that could use a smaller drive than the one shown in the tables. Therefore, it is essential to know the requirements of the application before selecting the drive. If they are unknown, we recommend to apply the general criteria mentioned earlier.

It goes without saying that drives whose Mp/Mo ratio is higher than 3 can also be selected; however, bear in mind that any oversizing (except in very particular cases) makes the system unnecessarily more expensive.

Calculation of the drive peak torque

Observe that having the Mp/Mn ratio has required getting the peak torque value of the drive (Mp). This value results from multiplying the peak current (Ip) of the selected drive by the torque constant (Kt) of the servomotor it is going to control. Remember that the values of the peak c u r r e n t o f FA G O R d r i v e s a r e s h o w n i n s o m e t a b l e s i n t h e

“man_dds_hard.pdf” manual.

Limiting the drive peak torque

Observe if result of the previous calculation is a drive peak torque value higher than the peak torque value of the servomotor it is going to govern, this value will limit the other one. Therefore, the drive never provides a peak torque higher than that of the servomotor. This fact appears in the tables with values in bold characters.

Explanatory notes

When mentioning FAGOR drives throughout this document, we mean

AXD, ACD, MMC and CMC drives; i.e. drives for controlling synchronous servomotors with A winding (powered at 400 Vac).

Remember that FAGOR also offers ACSD and MCS drives powered at

220 Vac (L series) and at 400 Vac (H series) that can also govern these servomotors (with F and A winding respectively).

If you wish to control the motor with any of them, consult the selection table for these drives shown on the first pages of its corresponding manual. Observe that each drive family mentioned here has its own manual.

2.

FXM|FKM

SERVOMOTOR

Ref.2105

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