Crane electric motors, squirrel-cage and wound-rotor


General information about crane motors

Application area of ​​crane motors

Crane (or, as they are also called, crane-metallurgical) electric motors are widely used in the construction, energy, mining and metallurgical industries. The main purpose of crane electric motors is to ensure reliable operation of the drive of cranes and other mechanisms operating in short-term and intermittent modes, as well as to drive mechanisms operating with frequent starts and electric braking (tower, portal, gantry, bridge cranes, elevators and various lifting mechanisms).

Design of crane electric motors

Crane electric motors of the MT series (MTF, MTH, MTI) are manufactured with a wound rotor, electric motors of the MTK series (MTKF, MTKH, MTKI) are manufactured with a squirrel-cage rotor. The range of crane electric motors (with squirrel cage and wound rotors) includes more than 80 standard sizes with rotation axis heights from 112 to 280 mm. All crane electric motors are manufactured as standard for temperate climates (climatic modification U1), and also, at the customer’s request, can be manufactured for operation in tropical climates (climatic modification T1) and for work in northern latitudes (version UHL). Due to their design features, all crane electric motors are capable of operating in “hot” shops of metallurgical plants. The crane motors are cooled using external airflow (IC 0141). The standard degree of protection of crane electric motors is IP44, the degree of protection of the terminal box and hatch of the slip rings of electric motors is IP 54.

Operating conditions for crane engines

The values ​​of environmental climatic factors for normal operation of crane electric motors are regulated by GOST 15150 and GOST 15543.1 for various types of climatic modifications:

  • the upper value of the operating temperature of the ambient air is not higher than 50°C, the lower value of the operating temperature: for U1 – not lower than 45°C; for UHL1 – not lower than 60°C; for T1 – not lower than 1°C.
  • relative ambient humidity: for climatic versions U1, UHL1 - 80% at 15°C; for climatic versions T1, O1 - 80% at 27°C.

Crane electric motors are designed for operation in the following conditions:

  • altitude above sea level – no higher than 1000 m.
  • the environment is not explosive, does not contain live dust, aggressive gases and vapors in concentrations that destroy metals and insulation.
  • dust content value - up to 100 mg/m3.

Features and purpose

Crane electric motors should be understood as electric drive units that move various mechanisms of crane installations. When considering lifting cranes as a component mechanism consisting of various components, the purpose of electric crane machines has several directions:

  • Moving the crane installation itself along rails;
  • Movement of crane installations in a vertical plane;
  • Rotation of crane elements;
  • Movement of lifting mechanisms to move the hook.

All manipulations with the load are carried out over a short-term period, therefore the operation of the crane electric motor must be carried out in intermittent modes, in which case the rotation speed range changes significantly. Because of this, they do not have to make long-term efforts, but the unit undergoes short-term loads and the effects of inrush currents. In addition to standard situations, the windings can be subject to overloads and overheating, therefore mechanism drives are manufactured with the following features:

  • In most cases, these are closed-type electrical machines; the outer casing allows them to be protected from mechanical influences during operation. For metallurgical units, exceptions may be made, since the increased temperature makes it necessary to ventilate the windings.
  • General industrial electric motors have improved insulation in terms of resistance to high temperatures, usually classes F and H. This allows the insulation resistance level to be maintained when it is heated.
  • Relatively low shaft inertia, which reduces electrical energy losses during transient processes at operating frequencies.
  • The magnetic system has good conductivity, which creates a powerful flow that can overcome serious load forces.
  • A high level of overload relative to the rated operating currents is allowed. The coefficient can reach from 2 to 5, which is considered normal for a crane electric motor.
  • Large spread of rotation speeds between minimum and maximum modes.

Some requirements for crane electric motors may be eliminated due to the peculiarities of operating modes and technical processes. And some types of specialization will be dictated by the type and design of the motor.

EXAMPLE OF DESIGNATION FOR CRANE ELECTRIC MOTOR TYPE 1:

  • MT, AMT, DMT series name
  • K – rotor type, squirrel-cage rotor, absence of letter – wound rotor
  • H or F – heat resistance class of insulation
      F - temperature index 155°C
  • H - temperature index 180°C
  • 0…7 — dimensions of the outer diameter of the stator sheets
  • 0…1 — engine modernization>
  • 1…3 - size of the length of the motor stator core
  • 6, 8, 10 - number of poles
  • U, T, UHL - climatic version
  • 1, 2 — accommodation category
  • Connection diagram for a wound rotor motor, time functions.

    The connection diagram for a wound-rotor motor is shown in Figure 1. This circuit uses a time function control and a two-stage starting resistor. By turning on the QF circuit breaker, voltage is supplied to the control and power circuit. This leads to the activation of time relays KT1, KT2 which open their contacts. By pressing the SB1 “Start” button, the KM3 magnetic starter is connected, which: opens the contacts:

    • KM3.3 - removes voltage from time relay KT1, which, after the end of the time delay, opens its contacts KT1.

    closes contacts:

    • KM3.1 in the stator circuit - the engine starts with two resistor stages connected to the rotor circuit, since the contactors KM1 and KM2 do not receive power. Before the time delay CT1 expires.
    • KM3.2 - bypasses the “Start” button (allows you not to hold the SB1 button pressed)
    • KM3.4 - in the circuit of coils of magnetic starters KM1 and KM2, but until the end of the time delay KT1, the starters KM1 and KM2 do not receive power.


      Figure 1.1 GIF - animation of the operating diagram for starting an asynchronous motor with a wound rotor

    For ease of viewing, all animation frames are posted at the end of the article.

    After the dwell time has expired, KT1 is triggered and closes its contacts - current flows through the KM1 coil, the starter is triggered and bypasses the first stage of the starting resistor R. At the same time, KM1.1 de-energizes time relay KT2 with its normally closed contacts. Until the end of the time delay KT2, the engine accelerates only with the second stage of resistance. After the end of the holding time, the resistor is completely bypassed and the engine returns to its natural mechanical characteristic. The launch is over.

    A crane electric motor is used to lift loads to different heights. Its peculiarity is that it is designed to operate in frequent starts. An ordinary engine, even a fairly powerful one, under such conditions overheats greatly and fails.

    The crane's electric motor operates at 380 volts, although there are options for other power supply values. As a rule, these are three-phase asynchronous devices with a wound rotor, regulated using resistances. In some models of taps, instead of resistors, thyristor regulators with horizontal control of the opening angle are installed. Such schemes allow for a smooth start, which eliminates jerks and jolts, and also makes working with the crane more comfortable and safe. DC motors can be used for the same purposes.

    EXAMPLE OF DESIGNATION FOR CRANE ELECTRIC MOTOR TYPE 2:

    • MT, AMT, DMT, 4MTM series name
    • K – rotor type, squirrel-cage rotor, absence of letter – wound rotor
  • H or F – heat resistance class of insulation
      F - temperature index 155°C
  • H - temperature index 180°C
  • 132…400 — height of the axis of rotation
  • S, M, L - installation dimension along the length of the bed
  • A, B or without a letter - designation of core length
  • 6, 8, 10 - number of poles
  • U, T, UHL - climatic version
  • 1, 2 — accommodation category
  • Designations of special versions of crane electric motors:

    • F – presence of an independent ventilation system with a centrifugal fan
    • 1F – presence of an independent ventilation system with an axial fan (self-ventilation is used by default)
    • 2P – modification used for variable frequency drives
    • B – presence of built-in temperature sensors type ST 14-2.

    Explanation of the designations of a crane electric motor with an attached feedback sensor:

    • G1 – with built-in pulse speed sensor model HOG 9
    • G10 – with the possibility of installing a pulse speed sensor HOG 9 by the customer independently
    • G2 – with built-in pulse speed sensor model HOG 10
    • G20 – with the possibility of installing a pulse speed sensor HOG 10 by the customer independently
    • G3 – with built-in pulse speed sensor model HOG 12
    • G30 – with the possibility of installing a pulse speed sensor HOG 12 by the customer independently
    • G4 – with built-in angular displacement transducer with sensor model LIR276A
    • G40 – with the possibility of installing the LIR276A sensor by the customer
    • G5 – with a built-in pulse speed sensor of a type individually agreed upon with the customer
    • G50 – with the possibility of installing a pulse speed sensor of a type individually agreed with the customer

    Overall and connecting dimensions of crane electric motors

    Typed30l33h31b1b10b12d1d5d10l1l3l10l31hh1h8b11l11h10Weight, kgvolume, m3
    4MT 200LA6, 4MTM 200LA64221053500163188065M42x3191401053351332001033,9400350242700,22
    4MT 200LB6, 4MTM 200LB64221053500163188065M42x3191401053351332001033,9400350243000,22
    4MT 200LA8, 4MTM 200LA84221053500163188065M42x3191401053351332001033,9400350242750,22
    4MT 200LB8, 4MTM 200LB84221053500163188065M42x3191401053351332001033,9400350243050,22
    MTF 411-6, MTH 411-6, 5MTF 411-6, 5MTH 411-642210535251633065M42x3281401053351752251033,9440435252900,23
    MTF 411-8, MTH 411-8, 5MTF 411-8, 5MTH 411-842210535251633065M42x3281401053351752251033,9440435252960,23
    MTF 412-6, MTH 412-6, 5MTF 412-6, 5MTH 412-642210535251633065M42x3281401054201652251033,9440510253220,23
    MTF 412-8, MTH 412-8, 5MTF 412-8, 5MTH 412-842210535251633065M42x3281401054201652251033,9440510253280,23
    4MTM 225L64651220545183569570M48x3191401053561492251136,4435410244900,31
    4MTM 225M64651110545183569570M48x3191401053111492251136,4435370243900,28
    4MTM 225L84651220545183569570M48x3191401053561492251136,4435410244700,31
    4MTM 225M84651110545183569570M48x3191401053111492251136,4435370243900,28
    MTH 511-646511105701838070M48x3351401053102512501136,4500480254150,29
    MTH 511-846511105701838070M48x3351401053102512501136,4500480254150,29
    MTH 512-646512205701838070M48x3351401053902712501136,4500600255200,32
    MTH 512-846512205701838070M48x3351401053902712501136,4500600255000,32
    4MTH 280S6, 4MTM 280S660512657402245712590M64x4241701303681902801446,8540430407400,57
    4MTH 280L6, 4MTM 280L660514397402245712590M64x4241701304571902801446,8540520409700,64
    4MTH 280S8, 4MTM 280S860512657402245712590M64x4241701303681902801446,8540430407400,57
    4MTH 280M8, 4MTM 280M860513457402245712590M64x4241701304191902801446,8540480408200,6
    4MTH 280S10, 4MTM 280S10, 5MTH 280S1060512657402245712590M64x4241701303681902801446,8540430407150,57
    4MTH 280M10, 4MTM 280M10, 5MTH 280M1060513457402245712590M64x4241701304191902801446,8540480408250,6
    4MTH 280L10, 4MTM 280L10, 5MTH 280L1060514397402245712590M64x4241701304571902801446,8540520409750,64
    MTH 611-660513357752252090M64x4421701303452563151446,8650575358050,63
    MTH 611-1060513357752252090M64x4421701303452563151446,8650575357800,63
    MTH 612-1060514357752252090M64x4421701304452563151446,8650645358900,67
    MTH 613-660515307752252090M64x4421701305402563151446,86507353510450,72
    MTH 613-1060515307752252090M64x4421701305402563151446,86507353510500,72
    MTH 711-107901710862640110210440323400790650
    MTH 712-107901710862640110210510323400790650
    MTH 713-107901710862640110210590323400790650
    4MTH 400S8, 4MTNF 400S87901735880256861103521016556028040079071012551,21
    4MTH 400M8, 4MTNF 400M87901815880256861103521016563028040079079014051,26
    4MTH 400L8, 4MTNF 400L87901885880256861103521016571028040079086015451,31
    4MTH 400S10, 4MTNF 400S10, 5MTH 400S107901665880256861103521016556028040079067012801,16
    4MTH 400M10, 4MTNF 400M10, 5MTH 400M107901736880256861103521016556028040079071014451,21
    4MTH 400L10, 4MTNF 400L10, 5MTH400L107901816880256861103521016563028040079079014451,26

    Crane electric motors, squirrel-cage and wound-rotor

    View the price of crane electric motors

    Crane electric motors of the MT series are designed to drive crane and other mechanisms operating in short-term and intermittent modes, including frequent starts and electrical braking. The engines can also be used for long-duty mechanisms.

    Crane electric motors are designed for power supply from a 380 V, 50 Hz network with three output ends from the stator winding, and can also be manufactured for voltages of 220/380 and 380/660 V with six output ends for connecting the phases in a star or triangle. At the customer's request, crane electric motors are manufactured for other voltages and frequencies.

    Crane electric motors MTF, MTH, MIT are manufactured with a wound rotor, MTKF, MTKH, MTKI motors are manufactured with a squirrel-cage rotor, one- and two-speed.

    Crane electric motors MT(K)F are designed for moderate climates (version U1), motors MT(K)N are designed for work at elevated temperatures (version U1), for tropical climates (version T1) and for cold climates (version HL1).

    Crane electric motors MT(K)I have a single climatic version 01 and, having certain heating reserves, allow operation in metallurgical production conditions

    Cooling of electric motors - external airflow (IC 0141). The degree of protection of the motors is IP 44, the degree of protection of the terminal box and hatch of the motor slip rings is IP 54.

      Design according to installation method (1M):
    • MT(K) 311, 312: IМ1001, IМ1002 - horizontal, with one and two cylindrical shaft ends;
    • IM2001 - horizontal flanged with one cylindrical shaft end;
    • IМ2011, IМ2012 - vertical flanged with one and two cylindrical shaft ends.
  • MT(K) 411, 411-M, MT(K) 412, 412-M:
      IM1003, IM1004 - horizontal, with one or two conical shaft ends.
  • MT(K)I 225:
      IM2003 - horizontal flanged with feet, with one conical shaft end;
  • IМ2013, IМ2014 - vertical flanged with one and two conical shaft ends.
  • Crane electric motors MT(K)I 225 can be manufactured with cylindrical shaft ends in the design IM1001, IM1002, IM2001, IM2011, IM2012.

    Crane electric motors MTF, MTKF, MTH, MTKH comply with GOST and the requirements of IEC regulatory documents. In terms of linking the power scale with the height of the rotation axis, MIT and MTKI engines comply with CENELEC and DIN standards.

    Crane electric motors of the MT and MIT types have safety certificates of conformity with the Gosstandart of the Russian Federation and are produced under a license from the Gosgortekhnadzor of Russia.

    Technical characteristics of crane squirrel-cage electric motors:

    engine's typePower at duty cycle 40%, kW Rotational speed, rpmWeight for IM1001,1003, kgStator current at U=380V, ARel. Max. moment. to nominal Efficiency, %Power factorHeight of rotation axis, mmHeat resistance class
    DMTKF 011-61,4875475,22,870,50,67112F
    MTKN 011-61,492045,54,52,870,50,67112N
    DMTKF 012-62,2880547,22,873,50,70112F
    MTKN 012-62,291549,56,52,873,50,70112N
    MTKN 111-63,5865778,92,7574,50,8132H
    MTKN 112-658908512,83,35760,78132H
    DMTKF 111-63,5900789,92,772,00,79132F
    DMTKN 111-63,0910789,52,768,00,70132H
    DMTKF 112-65,091092143,274,00,74132F
    DMTKN 112-64,59009212,74,171,50,75132H
    AMTKF 132 M65,090510312,62,187,0132F
    AMTKN 132 M64,590510311,72,387,0132H
    AMTKF 132 L67,590512018,51,487,0132F
    AMTKN 132 L67,090012018,52,387,0132H
    MTKI 160 M67,09051313,578,00,77160H
    MTKI 160 M85,06751313,077,00,68160H
    MTKI 160 L610,09151594,083,00,76160H
    MTKI 160 L87,06801592,880,00,69160H
    MTKF 311-611,091015528,52,977,50,76180F
    MTKN 311-611,091518526,72,981,00,77180H
    MTKF 311-87,569015521,82,773,50,71180F
    MTKN 311-87,5695185212,778,50,69180H
    MTKF 312-615,0930195363,281,00,78180F
    MTKN 312-615,0925205353,283,00,78180H
    MTKF 312-811,0700195292,978,00,74180F
    MTKN 312-811,070020529,22,981,50,70180H
    MTKF 411-622,0935255513,382,50,79225F
    MTKN 411-622,0935255513,382,50,79225H
    MTKF 411-815,0695255403,280,00,71225F
    MTKN 411-815,0695255403,280,00,71225H
    MTKF 412-630,0935315703,383,50,78225F
    MTKN 412-630,0935315703,383,50,78225H
    MTKF 412-822,0700315603,280,50,69225F
    MTKN 412-822,0700315603,280,50,69225H
    4MTKM 200 LA622,0935253483,387,00,80200H
    4MTKM 200 LA815,0705260403,283,00,70200H
    4MTKM 200 LB630,0945279613,387,50,85200H
    4MTKM 200 LB822,0700290543,283,00,75200H
    4MTKM 225 M637,0930360773,085,00,86225H
    4MTKM 225 M830,0700360722,884,00,75225H
    4MTKM 225 L655,09254601123,486,00,87225H
    4MTKM 225 L837,0700450852,885,00,78225H
    MTKN 511-637,0930360773,085,00,86250H
    MTKN 511-830,0700360722,884,00,75250H
    MTKN 512-655,09254601123,486,00,87250H
    MTKN 512-837,0700450852,885,00,78250H

    Technical characteristics of crane motors with wound rotor:

    engine's typePower at duty cycle 40%, kW Rotational speed, rpmWeight for IM1001,1003, kgStator current at U=380V, ARotor current, ARel. Max. moment. to nominal Efficiency, %Power factorHeight of rotation axis, mmHeat resistance class
    DMTF 011-61,4880565,29,02,589,00,66112F
    DMTF 012-62,2895637,511,52,387,00,68112F
    DMTF 111-63,59009218,715,02,286,0132F
    MTH 011-61,4890604,98,82,6650,67112H
    MTH 012-62,2895686,9112,7700,69112H
    MTH 111-63,5900919,714,32,3750,73132H
    MTH 112-6593010113,715,72,7790,7132H
    DMTN 111-63,08909218,215,02,588,0132H
    DMTF 112-65,092511025,415,72,687,0132F
    DMTN 112-64,590011024,015,62,488,0132H
    AMTF 132 M65,090512011,015,22,287,0132F
    AMTN 132 M64,592512312,914,32,387,0132H
    AMTF 132 L67,590014016,018,82,287,0132F
    AMTN 132 L67,092514019,120,72,487,0132H
    MTI 160 M67,093013818,73,081,00,69160H
    MTI 160 M85,096513816,92,578,00,64160H
    MTI 160 L610,095016624,73,584,00,69160H
    MTI 160 L87,070016620,42,579,00,64160H
    MTN 211-67,094516,02,787,0160N
    MTF 311-61194522029,3423,080,00,71180F
    MTN 311-61194022029,3413,080,00,71180H
    MTF 311-87,569522523,0213,076,00,65180F
    MTN 311-87,570022523,0213,076,00,65180H
    MTF 312-61595524037,5463,082,00,74180F
    MTN 312-61595024037,5463,082,00,74180H
    MTF 312-81169524032,7433,078,50,65180F
    MTN 312-81170524032,7433,078,50,65180H
    MTF 411-62296528051602,886,00,76225F
    MTN 411-62296528051592,886,00,76225H
    4MTM 200 LA62296027051592,886,00,76200N
    MTF 411-8157102804448,83,283,00,62225F
    MTN 411-81571028044463,283,00,62225H
    4MTM 200 LA81572027544463,283,00,62200N
    MTF 412-63097034555732,887,00,79225F
    MTN 412-63097034555722,887,00,79225H
    4MTM 200 LB63096030055722,887,00,79200N
    MTF 412-82272031558573,083,00,70225F
    MTN 412-82272031558583,083,00,70225H
    4MTM 200 LB82271530558583,083,00,70200N
    4MTM 225 M63795539080803,087,00,81225N
    MTN 511-63795539080803,087,00,81250N
    4MTM 225 L6559554901171222,988,00,81225N
    MTN 512-6559554901171222,988,00,81250N
    4MTM 225 M83071539074702,985,00,72225N
    MTN 511-83071539074702,985,00,72250N
    4MTM 225 L83772547088762,986,00,74225N
    MTN 512-83772547088762,986,00,74250N
    4MTH 280 S6759557401491803,289,00,86280H
    MTH 611-6759557401491803,289,00,86315H
    4MTH 280 L61109709702161683,591,00,85280H
    MTH 612-61109709702161683,591,00,85315H
    4MTH 280 M8757208201561883,090,00,81280H
    4MTH 280 L8907259801901713,291,00,79280H
    4MTH 280 M10605758251401623,288,00,74280H
    MTH 612-10605758251401623,288,00,74315H
    4MTH 280 L10755759751751503,089,00,73280H
    MTH 613-10755759751751503,089,00,73315H
    4MTN 400 L8200750148040727193,50,80400H
    4MTH 400 M8160750138033026693,30,79400H
    4MTH 400 S8132750123027227192,30,80400H
    4MTH 400 L1016060015803552422,5591,30,73400H
    4MTH 400 M1013260014202852492,191,30,73400H
    4MTH 400 S1011060012552402511,7590,50,73400H

    Dimensions of crane squirrel cage motors:

    engine's typel1l10l21l31l33b10b11HH31D20D22D24D25dbh
    DMTKF 011-6601405704071401881123202651523030028831
    DMTKF 012-6601595704421592101123202651523030028831
    DMTKF(N) 111-680190514071322029013234230018330250351038
    DMTKF(N) 112-680235513557422029013234230018330250351038
    AMTKF(N) 132 M611020358953621627013235030019250350421245
    AMTKF(N) 132 L611020358957621627013235030019250350421245
    MTKI 160 M140210510884525432016041030019250350601245
    MTKI 160 L140254510891025432016041030019250350601245
    MTKF(N) 311110260515563728035018044430019250350501453,5
    MTKF(N) 312110320517071228035018044430019250350501453,5
    MTKF(N) 411140335517574933044022552735019300400651666,4
    MTKF(N) 412140420516582433044022552735019300400651666,4
    4MTKM 200 L140305133910318400200500651666,4
    4MTKM 225 M140311149945356435225545701871,4
    4MTKM 225 L1403561491054356435225545701871,4
    MTKN 511140310251945380500250570701871,4
    MTKN 5121403902711054380500250570701871,4

    Dimensions of crane motors with wound rotor:

    engine's typeL1L10L21L31L33B10B11HH31D20D22D24D25dbh
    DMTF 011-6601405705131902401122902651523030028831
    DMTF 012-6601595705481902401122902651523030028831
    DMTF(N) 111-680190514067322029013234230015330250351038
    DMTF(N) 112-680235513571322029013234230015330250351038
    AMTF(N) 132M611020358966021627013235030019350250421245
    AMTF(N) 132L611020358970021627013235030019350250421245
    MTI 160M110210510884525432016041030019250350421245
    MTI 160L110254510891025432016041030019250350421245
    MTN 2111102435150731,524516030025040
    MTF(N) 3111102605155859,528035018044430019250350501453,5
    MTF(N) 3121103205170834,528035018044430019250350501453,5
    MTF(N) 4111403355175102733042022552535019300400651866,4
    MTF(N) 4121404205165110233042022552535019300400651866,4
    4MTM 200L140305133907318400200500651666,4
    4MTM 225M140311149960356435225545701871,4
    4MTM 225L1403561491070356435225545701871,4
    4MTH 280S1703681901090457540280740902291,8
    4MTH 280M1704191901170457540280740902291,8
    4MTH 280L1704571901260457540280740902291,8
    4MTH 400S8210560280147268679040088011025(106,8)
    4MTH 400M8210630280155268679040088011025(106,8)
    4MTH 400L8210710280162268679040088011025(106,8)
    4MTH 400S10210560280140268679040088011025(106,8)
    4MTH 400M10210560280147368679040088011025(106,8)
    4MTH 400L10210630280155368679040088011025(106,8)
    MTN 5111403102511110380500250570701871,4
    MTN 5121403902711220380500250570701871,4
    MTN 6111703452561265520650315775902291,8
    MTN 6121704452561345520650315775902291,8
    MTN 6131705402561439520650315775902291,8

    Drawings of crane squirrel-cage electric motors:

    Drawings of crane electric motors with a wound rotor:

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