Configuration Manual, Synchronous Built-in Motors 1FE1 - Siemens ...

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Description of the Synchronous Motor 1.1 Features, system prerequisites Comparison, synchronous/induction motor technology The most important advantages of synchronous motor technology with respect to induction motor technology are (assuming the same power rating and the same frame size): 1-16 S Higher torque (up to 60%) for the same active part volumes (compare, 1PH2 motors). This results in a more compact machine design. S Shorter accelerating times for the same moment of inertia S Lower cooling power required for the same torque Temperature characteristics, synchronous/induction motor technology S Typically, synchronous motor rotors have a different temperature characteristic than induction motor rotors. Under no load conditions and at high speeds induction motor rotors are cooler (lower temperature increase) -- while under full load conditions, rotors can reach temperatures of up to 250° C. S In the speed range up to 200% rated speed n ± 2 ¯ nN, a synchronous motor generates significantly less power loss in the rotor as a comparable induction motor rotor. This applies both for no--load operation as well as for operation with a load. This means that the bearing and rotor temperatures are lower, the spindle and material do not expand as much and a higher degree of precision is achieved. S In the speed range ² 2 ¯ nN up to the maximum motor speed, under no--load conditions, the synchronous motor can have a higher temperature rise than an induction motor. The reason for this is the field weakening current required, that for a synchronous motor must be additionally impressed in the winding in order to weaken the rotor field. For this speed range, typical temperature values for synchronous motors are 110° C in the stator. However, the temperature increase when a load is connected (approx.10...15° C) is significantly lower when compared to an induction motor. The rotor of an induction motor can reach approx. 250° C when a load is connected. S The temperature characteristic/behavior must be taken into consideration when designing the spindle. A comparison of torque/power for synchronous/induction motors Torque 1FE1...-6 1FE1...-4 Induction ~ 1/n ~ 1/n Speed ~ 1/n 2 ~ 1/n Power 1FE1...-6 1FE1...-4 Induction Speed Fig. 1-2 Comparison of the torque/power characteristics between 1FE1 built--in motors and induction motors ~ 1/n Synchronous Built-in Motors 1FE1 Configuration Manual (PJFE), 09/2008, 6SN1197 -0AC00 -1BP0
Synchronous Built-in Motors 1FE1 Configuration Manual (PJFE), 09/2008, 6SN1197 -0AC00 -1BP0 Description of the Synchronous Motor 1.1 Features, system prerequisites Permanent -magnet synchronous motors Depending on the motor type, the rotor has inner (IPM) or outer (APM) permanent magnets, refer to Chapter 2.5.2. Motor spindle A motor spindle generally comprises the following assemblies (refer to Fig. 1-3): S Spindle housing S Spindle shaft with bearings S Built--in motor S Cooling system S Encoder system Encoders Bearing endshield, NDE Stator with cooling jacket Drain hole Spindle housing Fig. 1-3 Design of a motor spindle Cooling medium discharge Rotor with sleeve Cooling medium intake Spindle shaft with bearings Drain hole Bearing endshield, DE Note The spindle manufacturer is responsible for designing the bearings, lubrication and cooling. A ferrite spindle shaft is required in order to achieve the appropriate electrical characteristics. 1-17
Page 1: Configuration Manual 09/2008 Synchr
Page 4 and 5: 3ls Designation of the documentatio
Page 6 and 7: Foreword Technical Documentation vi
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Page 12 and 13: Foreword xii Space for your notes S
Page 14 and 15: Table of Contents 4 Order Designati
Page 18 and 19: Description of the Synchronous Moto
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Brief Mounting Overview 2.5 Mountin
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Order Designation 4-90 Order design
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Technical Data and Characteristics
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Dimension Drawings 6.14 VP module 6
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References A-244 Space for your not
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Index I Induction motor technology,
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Index I-248 Space for your notes Sy
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Siemens AG Automation and Drives Mo
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