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4 03.01 4.7Permanent–magnet synchronous motor with field weakening 4-155 Siemens AG 2003 All rights reservedSIMODRIVE P

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Content	4 03.01 4.7Permanent–magnet synchronous motor with field weakening 4-155 Siemens AG 2003 All rights reservedSIMODRIVE POSMO SI/CD/CA User Manual (POS3) – 07.03 Edition 4.7Permanent–magnet synchronous motor with field weakening (PE spindle, only with POSMO CD 18A / CA 9A) 4.7.1Description Permanent–magnet synchronous motors with field weakening (1FE1 motors) are liquid–cooled synchronous motors which are supplied as components. A complete motor–spindle unit is formed by mounting the components on a spindle. The rotor of the 1FE1 motor has permanent magnets. The high speeds for spindle operation are achieved by a current counteracting the field. This is similar to field weakening for induction motors. The advantages of permanent–magnet spindles in comparison to induction motors include: A very low rotor power loss ––> low bearing temperature Higher torque for the same active part volumes ––> more compact machine design Shorter acceleration times for the same moment of inertia Improved efficiency More favorable Cos ϕ ––> it may be possible to use a smaller power module Improved speed/power characteristic ––> the power is not decreased in the upper speed range Reader’s note Detailed information on 1FE1 motors, engineering/configuring and mounting built–in motors is included in: References:/PJFE/ AC Motors for Main Spindle Drives 1FE1 Synchronous Built–in Motors Engineering/Installation Instructions Manufacturer Documentation What is a perma- nent–magnet synchronous motor with field weakening? Advantages 4 Start-Up08.02
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