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High-Voltage AC Squirrel-Cage Motors


H-compact: the basic concept

– Ribbed and internal cooling for IP 55 up to 3,000 kW – Extremely high output for the various shaft heights – Torsionally rigid, robust frame, and end shields manufactured from cast iron

The increasing significance of power saving, environmen-

with external and internal ribs

tal requirements, the desire for smaller dimensions, and

– Reliable bearing design

stipulations imposed by national and international mar-

– Rotor with aluminum die-cast cage for

kets led to the ongoing development of the H-compact

high reliability and low stray losses

series, which has proven itself over the years.

– With the aluminum die-cast cage, 5,000 starts per annum permissible as

H-compact motors are used in the widest range of indus-


trial sectors, such as oil & gas, chemical, paper, and steel.

– On request, motor versions are avail-

Here, they drive compressors, fans and blowers, refiners,

able with copper cage instead of the

mills, and air-separation compressors.

standard die-cast aluminum cage – Long locked-rotor times and high

H-compact is available in versions which can be directly connected to the line supply and can be connected to drive converters. H-compact is also available in an explosion-protected design.

starting torques – High impulse strength of the main and conductor insulation – Low noise – Long-term corrosion protection

The innovative technology of H-compact motors has set new standards for high-voltage motors.

Motor 560 kW, 6 kV, 1,490 rpm, IM B3


H-compact: types of construction, degrees of protection, cooling methods Types of construction

Transport and safety Two lifting eyes are screwed into the motor frame diago-


nally for active safety during transport and installation.

– Standard motors in type

They can be swiveled through 360° and tilted 180°

of construction IM B3 – Other types of construc-

around a hinge. They are self-aligning in the direction of the rope pull.

tion are available on request, e.g. IM B35

Monitoring A motor, no matter how high the quality or degree of


technical sophistication, can be subject to stress in

– IM V1 with and without

operation for which it was not originally designed.

protective canopy

Monitoring systems can be used with the appropriate sensors and devices to continually check and signal

Degrees of protection

electrical, thermal, and mechanical operating data. The

– IP 55 and higher

following monitoring devices are available as standard: – Slot resistance thermometer PT 100

Cooling type

– SPM nipple (rolling-contact bearings)

– IC411

Motor in type of construction IM B3, degree of protection IP 55, cooling type IC411

IM VI with/without protective canopy


H-compact: efficient cooling and low noise The H-compact series includes high-voltage induction motors with surface and internal cooling (t.e.f.c. motors). By optimizing the rib cooling and providing additional internal cooling, this cooling design is practical for large motor outputs, both from technical and cost-effective perspectives. With the appropriate electrical design and optimized mechanical design, outputs up to 3,000 kW can be achieved. The motor is air-cooled. For all of the motors, the air enters at the non-drive end. Most of the heat losses are transmitted from the laminated stator core to the ribbed motor frame. Here it is dissipated by the cooling airflow. The remaining loss, which mainly comprises the heat losses of the rotor and in part the stator winding ends, is transmitted to the frame through the internal cooling circuit.

Fan versions Fan and fan cowl are aerodynamically optimized.

The external air is blown over the cooling ribs by the external fan, whereby the cooling airflow passes along the ribs from the non-drive end to the drive end by virtue of the frame waisting. The frame and end shields have been designed for optimum flow to obtain a higher rate of heat dissipation. There are no obstacles in the cooling airflow as the terminal boxes are mounted away from the ribs. The frame zones around the stator winding ends are provided with internal ribs and play a more significant role in dissipating heat.

â–  External fans: For motors with 4 and higher number of poles, the fans are designed for one direction of rotation and are manufactured from metal in order to reduce the noise and increase the efficiency. Smaller motors, up to average shaft heights, have plastic fans and are bidirectional. 2-pole motors normally have unidirectional aluminum axial fans.

â–  Internal fans: Metal, bidirectional fans are always used.

Cooling principle with external cooling air flow and internal cooling circuit


The internal cooling circuit is harmonized to the conditions in a totally enclosed motor. The internal fan at the non-drive end draws the air through ventilation holes in the rotor. The airflow at the internal ribs of the frame and end shields is subject to heavy turbulence and is thoroughly cooled. The frame acts as heat exchanger between the internal and external cooling air. The cooled air returns to the drive end through 4 air ducts in the frame in the same direction as the external cooling air. This co-directional principle results in uniform heat dissipation and – particularly for the drive-end bearing – in low temperatures. The heat dissipation is conceived for a particularly long service life by keeping the winding and bearing temperatures evenly distributed between the drive and non-drive ends. H-compact is extremely quiet This is achieved, among other things, by using an air inlet cowl manufactured from fiberglass-reinforced plastic or metal. Metal fan cowls are provided with noise-absorbing mountings. For particularly high demands, sound-reducing modules are available. – Special fan cowls with integrated air inlet damper – Noise-absorbing frame jackets

External fans: metal, plastic, aluminum


H-compact: frame and end shield The motor frame and the end shield are ribbed and manufactured from cast iron. A sophisticated design, e. g. frame details, internal ribs in the area of the stator winding overhang, and box section feet over the complete length give the frame very high strength and rigidity. Four axial ducts for guiding the internal cooling air are evenly distributed in the frame. The main and auxiliary terminal boxes are bolted to the two upper ducts which also accommodate the winding and monitoring leads.

Frame, type of construction IM B3

End shield, type of construction IM B3


H-compact: reliable bearings

contact ball bearing and deep-groove ball bearing), and a preloaded deep-groove ball bearing to locate the rotor at the non-drive end. For shaft height 630, an angular-contact ball bearing is used as the support bearing at the non-drive end, and a zerobacklash preloaded deep-groove ball bearing is used at the drive end to locate the rotor. Sleeve bearings are fitted where the conditions re-

The motors are normally equipped with rolling-

quire them or on request of the customer. The bear-

contact bearings. When the application limits (de-

ings are of the flanged type and are suitable, without

pending on the speed, load, and operating condi-

any modifications for both directions of rotation.

tions) are exceeded, sleeve bearings are used.

Depending on the bearing load, they have oil-ring lubrication with natural cooling by radiation and

For type of construction IM B3, the locating bearing is

convection or forced oil lubrication. It is possible to

normally at the drive end and the floating bearing at

change over from natural cooling to forced oil lubri-

the non-drive end. Up to and including shaft height

cation without having to make any prior modifica-

450, a deep-groove ball bearing is used at the drive


end and a preloaded deep-groove ball bearing at the non-drive end. For shaft heights greater than 450, a

The bearings at the drive and non-drive end are float-

double bearing is used at the drive end (comprising a

ing bearings. The axial play which can be used is

roller bearing for the radial load and a deep-groove

+/– 6.25 mm. In this case, the motor rotor and the

ball bearing for the axial load) and a roller bearing

line of shafting must be located axially using a

(resp. a deep-groove ball bearing for shaft height 630)

limited-end float coupling at the driven machine.

on the non-drive end. For type of construction IM V1, up to and including shaft height 560, a double bearing is used as support bearing at the drive end (comprising an angular-

Open rolling-contact bearing

Open flanged sleeve bearing with oil ring 7

H-compact: proven MICALASTIC VPI insulation

H-compact: reliable and versatile termination technology

The Siemens MICALASTIC® insulating system is used

External leads are either connected

which has been proven worldwide in high-voltage

in terminal boxes as standard or on

motors with high rated outputs for many decades.

request with cable connectors at a connection plate. A pressure-relief

An important component of this insulating system is

diaphragm provides protection

the vacuum pressure impregnation (VPI) process.

against short-circuits in the terminal box. The high rate of pressure

This technique ensures the following:

rise is released in a controlled

– Almost void-free insulation, therefore no corona

fashion towards the motor frame.

discharge – Good thermal conductivity between the winding and laminated core

The terminal boxes can be rotated through 90°, the bracket through

– High mechanical strength

180° – this is advantageous where

– Long service life

space is restricted or where the motor feeder cable must be routed in a certain direction.Terminal boxes can be re-located from the right to the left and vice versa as a result of the symmetrical arrangement of the stator leads in the motor.

Assembly 8

Terminal box 315 A, 6 kV

Terminal box 2 x 315 A, 6 kV

Terminal box 360 A, 11 kV


H-compact: technical data and dimensions The wide range of types provides a broad and finely graduated range of outputs. The motors are available for rated voltages from 2 to 11 kV. The rated frequency is between 50 and 60 Hz. Motors with 2 to 8 poles are available as standard, motors with a higher number of poles can be supplied. The H-compact series is suitable for use in Zone 2 (non-sparking). Type of protection EEx e “increased safety� for Zone 1 is available as standard. Maximum dimensions in mm for versions with rollingcontact bearings for 6 kV H






















































3,000 Rated motor output

kW 2,500




500 200 0

No. of poles 2 Speed 3,000

4 1,500

6 1,000

8 750

Output range at 6 kV, 50 Hz, insulation Class F, utilized to B. The output range is covered by shaft heights 315 to 630.


Service and support worldwide: we are available to answer all of your questions You are on the right track when you select the right

that for us, quality starts by selecting the

motor because everything runs smoothly right from the

right suppliers. Quality control and quality

start. This also applies to quality and service. Our person-

assurance don’t only mean a qualified

nel support you in implementing the optimum motor

incoming check, but also producing quali-

concept. And because subsequent service satisfies all of

ty. A feedback system enables us to imple-

our customers demands.

ment actions to improve and optimize the quality standard. And when it comes to

In 130 countries of the world

the final check, we ensure that only per-

You can always rely on Siemens. We are one of the world’s

fect products leave our production facili-

leading electrical and electronic engineering companies

ties. If you so wish, we can also carry out

and we are close to our customers everywhere: around

customer-specific tests.

the globe, in 130 countries and in more than 450 cities – our support is always close to you. And you will always be

Simply ask us – as partners, we will take

able to find somebody you can actually speak to.

care of all of your needs.

Optimum customer orientation

Hotline: + 49 (0) 1 80/5 05 02 22

Our organization is consequentially oriented to our customer’s requirements. We consider ourselves as partners to our customers. Support when selecting the optimum motor concept up to services after the motor has been shipped – such as maintenance, troubleshooting, and, and, and. Our philosophy and organization make it a lot easier for you. This is because we offer much more than just technology. We can flexibly respond to individual customer’s requirements as a result of our logistics and production system – and that in line with market requirements. Quality An excellent product can only be manufactured from optimum components and materials. This is the reason



Siemens Aktiengesellschaft Automation & Drives Large Drives P. O. Box 47 43, D-90025 Nuremberg, Germany

Subject to change without prior notice 03/02 | Order No. E20001-A70-P530-X-7600 | Dispostelle 21506 | 21D6310 MK.LD.XX.LDHM.52.2.01 WS 03023. | Printed in Germany

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