4
01.99
4.8
Permanent–magnet synchronous motor with field–weakening (PE spindle)
4-153
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
4.8
Permanent–magnet synchronous motor with field–weak-
ening (PE spindle)
4.8.1
Description
The permanent–magnet synchronous motors with field weakening
(1FE1 motor series) are liquid–cooled synchronous motors, which are
supplied as components. After the components have been assembled
on the spindle, a complete motor spindle unit is formed.
The rotors of 1FE1 motors are equipped with permanent magnets. The
high speeds for spindle operation are achieved by a current which op-
poses the field. This is similar to field weakening for induction motors.
The advantages of permanent–magnet spindles in comparison to in-
duction motors are:
Extremely low power loss in the rotor
––> low bearing temperature
Higher torque for the same active part dimensions
––> more compact machine design
Shorter accelerating times with the same moment of inertia
Improved efficiency
Favorable Cos
ϕ
––> it may be possible to use a smaller power module
More favorable speed/power characteristic
––> no power reduction in the upper speed range
Reader’s note
Detailed information on 1FE1 motors, configuring and mounting
built–in motors are provided in:
Reference:
/PJFE/ AC Motors for Main Spindle Drives
Synchronous Build–in Motors 1FE1
Planning/Mounting Guide
Manufacturers Documentation
What is a
permanent–
magnet
synchronous
motor
with field
weakening?
Advantages
4 Commissioning