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IEC Squirrel-Cage Motors Motors operating with frequency converters Orientation 5 ■ Technical specifications (continued) Bearings and bearing currents When operating multiphase induction machines on a converter, an electrical bearing stress results from a capacitive induced voltage via the bearing lubricating film, depending on the principle being used. The physical cause of this is the common-mode voltage at the converter output. The sum of the three phase-toneutral voltages is not zero at all times, unlike with direct on-line operation. The high-frequency, pulse-shaped common-mode voltage brings about a residual current, which closes back to the converter’s DC link via the machine’s internal capacitances, the machine housing and the earthing circuit. The machine’s internal capacitances include the main insulation winding capacitance, the geometric capacitance between the rotor and stator, the lubricating film capacitance and the capacitance of any bearing insulation that may be present. The current level via the internal capacitances is proportional to the common-mode voltage regulation (i (t) = C¼du/dt). In order to apply currents to the motor which are sinusoidal as far as possible (smooth running, oscillation torques, stray losses), a high clock frequency is required for the converter’s output voltage. The related (very steep) switching edges of the converter output voltage (and also, therefore, of the common-mode voltage) cause correspondingly high capacitive currents and voltages on the machine’s internal capacitances. In the worst-case scenario, the capacitive voltage induced via the bearing can lead to random punctures of the bearing lubricating film, thus damaging the bearing/causing premature wear. The current pulses caused by the puncture in the lubricating film are referred to as EDM (Electrostatic Discharge Machining) currents, although this is not primarily a question of an electrostatic effect, but more of (partial) punctures of insulating material, i.e., of partial discharges. This physical effect, which occurs in isolated cases, has mostly been observed in connection with larger motors. EMC-compliant installation of the drive system is a basic prerequisite for preventing premature bearing damage via bearing currents. The most important measures for reducing bearing currents: • Insulated motor bearings at the non-drive end NDE (BS) The insulated bearing is standard for all non-standard 1LA8 motors designated for converter operation. Furthermore it is recommended that an insulated bearing is ordered for NDE for motor series 1LG, 1PP4 and 1LP4 frame size 225 and above (order code L27), for 1MJ7 motors, order code L27 is possible from frame size 250 to 315. • Earthing brush for converter-fed operation for 1LG motors (order code M44) • Use of cables with a symmetrical cable cross-section: L3 L1 L2 PE L3 Concentric Cu or Al screen L1 PE L2 L3 L1 L2 • Use of motor reactors • Use of earthing cables with low impedance in a large frequency range (0 Hz up to approximately 70 MHz): for example, plaited copper ribbon cables, HF litz wires • Separate HF equipotential-bonding cable between motor housing and driven machine • Separate HF equipotential-bonding cable between motor housing and converter PE busbar • 360° HF contacting of the cable shield on the motor housing and the converter PE busbar. This can be achieved using EMC screwed glands on the motor end and EMC shield clips on the converter end, for example. • Common-mode filters at the converter output. PE PE Steel reinforcement G_D011_EN_00065 5/8 Siemens D 81.1 · 2006
IEC Squirrel-Cage Motors Motors operating with frequency converters Orientation ■ Selection and ordering data Preliminary selection of the motor according to motor type/series, speed or number of poles, frame size, rated output, rated torque, rated speed and rated current Surface-cooled motors with standard insulation for voltages ˆ500 V - Aluminium or cast-iron housing See section “Surface-cooled motors with standard insulation for voltages ˆ500 V - Aluminium or cast-iron housing” Pages 5/10 and 5/11. Self-ventilated motors with special insulation for voltages up to 690 V Speed Frame size Rated output Rated speed Rated torque Rated current at 690 V Detailed selection and ordering data Page rpm kW rpm Nm A Aluminium series 1LA7 and 1LA5 3000, 2-pole 100 L ... 225 M 3 ... 45 2890 ... 2960 9.9 ...145 3.5 ... 45.0 5/12 ... 5/13 1500, 4-pole 100 L ... 225 S 2.2 ... 37 1420 ... 1470 15 ... 240 2.75 ... 38.5 5/12 ... 5/13 1000, 6-pole 100 L ... 225 M 1.5...30 925...978 15...293 2.25...35.5 5/12 ... 5/13 Cast-iron series 1LG6 3000, 2-pole 180 M ...315 L 22 ... 200 2955 ... 2982 71 ... 641 22.5 ... 188 5/14 ... 5/16 1500, 4-pole 180 M ... 315 L 18.5 ... 200 1470 ... 1490 120 ... 1282 20 ... 198 5/14 ... 5/16 1000, 6-pole 180 L ... 315 L 15 ... 160 975 ... 990 147 ... 1543 17.2 ... 164 5/14 ... 5/16 750, 8-pole 180 L ... 315 L 11 ... 132 725 ... 740 145 ... 1704 13.8 ... 140 5/14 ... 5/16 Cast-iron series 1LA8 3000, 2-pole 315 ... 450 240 ... 970 2978 ... 2987 770 ... 3101 730 ... 900 3/18 ... 3/19 1500, 4-pole 315 ... 450 235 ... 980 1485 ... 1492 1511 ... 6273 235 ... 950 3/18 ... 3/19 1000, 6-pole 315 ... 450 190 ... 780 990 ... 993 1833 ... 7502 196 ... 790 3/20 ... 3/21 750, 8-pole 315 ... 450 145 ... 600 740 ... 745 1871 ... 7691 162 ... 660 3/20 ... 3/21 5 Forced-air cooled motors with externally mounted fan with special insulation for voltages up to 690 V Speed Frame size Rated output Rated speed Rated torque Rated current at 690 V Detailed selection and ordering data Page rpm kW rpm Nm A Cast-iron series 1PQ8 3000, 2-pole 315 ... 450 240 ... 970 2978 ... 2987 770 ... 3101 730 ... 900 3/26 ... 3/27 1500, 4-pole 315 ... 450 235 ... 980 1485 ... 1492 1511 ... 6273 235 ... 950 3/26 ... 3/27 1000, 6-pole 315 ... 450 190 ... 780 990 ... 993 1833 ... 7502 196 ... 790 3/28 ... 3/29 750, 8-pole 315 ... 450 145 ... 600 740 ... 745 1871 ... 7691 162 ... 660 3/28 ... 3/29 ■ More information Planning notes for drives with constant and square-law torque can be found in the following catalogs: • Frequency converters - MICROMASTER 410/420/430/440: Catalog DA 51.2 • Frequency converters for distributed drive solutions - MICROMASTER 411/COMBIMASTER 411: Catalog DA 51.3 • SIMOVERT MASTERDRIVES Motion Control/Vector Control: Catalog series DA 65 • SINAMICS G110, G130 and G150 frequency converters: Catalog series D 11 • SINAMICS S120 and S150 drive systems: Catalog series D 21 These catalogs contain tables that specify the assignment of squirrel-cage motors to converters from Siemens in accordance with the load characteristic of the driven machine. For further information, please contact your local Siemens contact – see “Siemens contacts worldwide” in the Appendix. Siemens D 81.1 · 2006 5/9
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Catalog D 81.1 • 2006 MOTORS Low-
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Low-Voltage Motors IEC Squirrel-Cag
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Siemens D 81.1 · 2006 3
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and production areas to shipping. T
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DATE: EMPLOYEE COST CENTER PAY PERI
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Introduction 1 1/2 Guide to selecti
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IEC Squirrel-Cage Motors Introducti
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Standard motors up to frame size 31
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■ Overview (continued) Efficiency
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■ Integration MICROMASTER 411/ CO
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IEC Squirrel-Cage Motors Standard m
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■ Overview (continued) Taper pins
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Non-standard motors frame size 315
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■ Dimensional drawings Cast-iron
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Explosion-proof motors 4 4/2 Orient
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■ Benefits The explosion-proof mo
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IEC Squirrel-Cage Motors Fan motors
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p Standard version † With no extr
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■ Dimensional drawings Aluminium
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■ Dimensional drawings Aluminium
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Compressor motors 8 8/2 Orientation
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IEC Squirrel-Cage Motors Compressor
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Smoke-extraction motors 9 9/2 Orien
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Special versions Self-ventilated mo
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Special versions p Standard version
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Marine motors 10 10/2 Orientation 1
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IEC Squirrel-Cage Motors Marine mot
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■ Overview Most non-standard moto
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Standard motors up to frame size 31
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Appendix 11 11/2 Overview of produc
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IEC Squirrel-Cage Motors Appendix O
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IEC Squirrel-Cage Motors Appendix T
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IEC Squirrel-Cage Motors Appendix A
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IEC Squirrel-Cage Motors Appendix C
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IEC Squirrel-Cage Motors Appendix S
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IEC Squirrel-Cage Motors Appendix S
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Section 1 Section 2 IEC Squirrel-Ca
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IEC Squirrel-Cage Motors Appendix I
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Catalogs of the Automation and Driv
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Low-Voltage Motors Squirrel-Cage Mo
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