13 - PVD 3674_GB_K Series_CE-November 2016.Docx
The motor adapted to the duty cycle has to provide the rms torque M
rms
at the rms
speed(*) without extra heating. This means that the permanent torque M
n
available at
the average speed presents a sufficient margin regarding the rms torque M
rms.
(*) rms speed is calculated thanks to the same formula as that used for the rms torque.
The mean speed cannot be used (in general mean speed is equal to zero).
Only use the rms speed.
Furthermore, each Mi and speed associated Ωi of the duty cycle has to be located in
the operational area of the torque vs speed curve.
Torque
M
k
M
rms.
M
n
M
i
Ωi Ωk Ω
rms
Ωn Speed
3.1.4. Kit Selection
The selection of a particular frame size and winding for an application depends on:
Dimensions (diameter and length) requirement
Power (torque and speed) requirement
Voltage and current available or required
The first two items are dependent on the load and performance specifications of the
application. They result in the selection of a particular frame size (032 through 178)
and stack length. The winding to be used will then be determined by the voltage and
current available or required.
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