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Electric motors are among the core components that directly affect the operating continuity of pumps, fans, compressors, conveyors, crushers, mills and production machinery. For this reason, motor selection should not be based only on purchase price or kW rating. Efficiency, winding and housing design, bearing system, thermal protection, duty cycle, mounting arrangement, serviceability and correct application selection must all be considered together.
DRG MOTOR supplies three-phase asynchronous electric motors designed for high efficiency, robust mechanical construction and long-term industrial use. With a broad range of power ratings, speeds and mounting options, it provides solutions for both machine manufacturers and maintenance or replacement projects.
On this page, you can explore the key technical and commercial reasons for choosing DRG MOTOR in detail.
1. 100% Copper Windings
The winding system is one of the most important factors affecting the electrical performance of a motor. DRG motors use 100% copper windings; aluminium windings are not used.
Copper’s high conductivity helps reduce electrical losses.
Lower winding resistance supports controlled operating temperatures.
It contributes to stable operation during starting and under load.
With correct cooling and operating conditions, it supports a long winding service life.
It is compatible with the material standard widely used in industrial maintenance and rewinding processes.
2. VPI Vacuum Pressure Impregnation System
DRG motor windings feature VPI (Vacuum Pressure Impregnation). In this process, the winding system is impregnated with insulating resin under vacuum and pressure.
VPI helps to:
create a unified and mechanically strong winding structure,
reduce the effect of moisture, dust and vibration on the windings,
limit movement between winding conductors,
support electrical insulation strength,
improve reliability in machines subject to frequent starts and vibration.
This is an important advantage for continuously operated or demanding applications such as crushers, compressors, pumps, fans, mills and conveyors.
3. Robust Cast-Iron Housing
DRG motors feature an industrial-grade cast-iron housing. Cast iron improves mechanical strength, helps damp vibration and contributes to balanced heat dissipation through the motor housing.
It offers resistance against impact and external mechanical effects.
It provides a strong motor base for heavy machinery.
It helps maintain the alignment of bearing seats and the rotor-stator axis.
It preserves housing rigidity in vibration-intensive environments.
It provides a structure suitable for long-term industrial use.
4. Standard NU Bearings on Large-Frame Motors
In high-power electric motors, rotor weight, belt-and-pulley loads, shock loads and thermal expansion place greater demand on the bearing system. For this reason, DRG motors are equipped with NU-type cylindrical roller bearings as standard from certain larger frame sizes and power ratings upward.
Key benefits of NU bearings include:
higher radial load capacity than ball bearings,
a structure better suited to heavy rotors and belt-and-pulley drives,
more controlled accommodation of thermal expansion within the motor,
improved bearing reliability in heavily loaded drive systems,
strong suitability for crushers, mills, compressors, large fans and conveyors.
The exact frame size and power rating at which NU bearings become standard may vary according to the motor’s pole number, mounting arrangement and product series. It is confirmed from the applicable technical data sheet when ordering.
5. Standard PTC Thermistor Protection on Large Motors
Monitoring winding temperature is especially important in high-power and critical applications. DRG motors are supplied with PTC thermistor protection as standard from certain larger frame sizes and power ratings upward.
PTC sensors monitor winding temperature directly inside the motor. When used with a suitable thermistor relay or drive input, they can provide an alarm or stop signal when temperature reaches the defined limit.
PTC protection provides an additional safeguard against winding overheating caused by:
overload,
phase imbalance or phase loss,
insufficient cooling,
high ambient temperature,
frequent starts and stops,
fan failure or obstructed air passages.
The exact standard-equipment threshold is verified through the technical data sheet according to the motor series, power rating and pole number.
6. Reliable Bearing Options and Strong Shaft Design
The mechanical service life of an electric motor depends greatly on bearing, shaft and bearing-seat quality. Depending on motor type and application, DRG motors use reliable bearing options from SKF, NSK or C&U.
Precisely machined shafts and bearing seats support low runout.
Dynamic balancing helps reduce vibration.
Larger frames offer regreasing capability for easier maintenance.
Suitable seals help limit dust and moisture entry into the bearing area.
Correct fixed- and floating-bearing arrangements help manage thermal expansion.
7. IE3, IE4 and IE5 High-Efficiency Options
Energy consumption represents a significant share of an electric motor’s total cost of ownership. DRG MOTOR provides solutions in IE3, IE4 and IE5 efficiency classes, according to the application and product series.
High-efficiency motors help to:
perform the same mechanical work with lower electrical losses,
reduce energy costs during long operating hours,
limit thermal loading through lower losses,
support an operation’s energy-efficiency objectives,
meet current efficiency requirements in new machinery and plant projects.
Actual energy savings should be calculated based on motor power, annual operating hours, load factor, electricity price and the efficiency of the motor being replaced.
8. Low-Loss Electrical Steel and Precision Rotor-Stator Design
Motor efficiency is not determined by copper content alone. The quality of the magnetic electrical steel, processing of the lamination stack and precision of the rotor-stator air gap also directly affect performance.
DRG motors use low-loss silicon steel, precisely assembled laminations and a controlled air gap to support:
reduction of magnetic losses,
controlled motor current and heating,
stable torque production,
preservation of efficiency values,
reduced vibration and electromagnetic noise.
9. Effective Cooling System
Operating temperature is a key factor influencing insulation and bearing life. The cooling ribs, fan and fan cover of DRG motors are designed to provide the air circulation required by the motor.
Cooling ribs help transfer heat to the outer surface.
The aerodynamic fan design provides effective airflow.
The steel fan cover provides protection against external impact.
Balanced cooling contributes to controlled winding and bearing temperatures.
10. Class F Insulation System and Thermal Safety Margin
DRG motors use a Class F insulation system as standard. Class F insulation is suited to industrial operating temperatures and provides a reliable thermal operating margin under normal service conditions. Higher insulation classes may be evaluated for special applications.
11. IP55 Protection Class
The standard IP55 protection class helps protect the motor against harmful dust accumulation and water jets from different directions. This makes the motors suitable for factories, machine rooms, pump systems, fan applications and many industrial environments.
Where there is intense dust, chemical vapour, high humidity, outdoor exposure or pressurised water, application-specific higher-protection solutions should be evaluated.
12. Low Vibration and Smooth Operation
Correct rotor balancing is important for the service life of bearings, couplings, pulleys, gearboxes and the driven machine. DRG motor rotors undergo dynamic balancing, and motors are subject to vibration control.
Low vibration helps to:
prevent unnecessary loading on bearings,
preserve coupling and pulley alignment,
reduce the risk of fastener loosening,
support quieter and more stable machine operation.
13. Safe and Practical Electrical Connections
A robust terminal box and high-quality connection components make safe and fast commissioning easier in the field.
Copper or brass connection bars,
terminal arrangements suitable for star-delta connection,
terminal boxes that can be adapted to different mounting orientations,
cable-gland-ready cable entries,
clear rating plates and connection information
all make installation and maintenance easier for technical teams.
14. Wide Selection of Power, Speed and Mounting Options
DRG MOTOR offers a broad product range compatible with different machine designs:
Power range: 0.25–355 kW
Speed options: 1,000, 1,500 and 3,000 rpm
Mounting arrangements: B3, B5, B14, B34 and B35
Efficiency classes: IE3, IE4 and IE5
Duty cycles: S1 and S3 options according to the application
Housing options: cast iron or aluminium housing depending on power rating and product series
This variety makes it easier to select the right motor for new machine production, replacement projects and non-standard applications.
15. Solutions for Demanding Applications
DRG motors can be used in a wide range of industrial machines and systems:
crushing and screening plants,
crushers and mills,
concrete batching plants and asphalt plants,
screw and piston compressors,
centrifugal, fire-fighting, booster and process pumps,
industrial fans, extractors and HVAC systems,
belt, chain and screw conveyors,
geared drive systems,
mixers and agitators,
cranes and lifting systems,
feed, flour and food-processing machinery,
recycling and waste-processing machinery,
marble, mining, ceramic and cement machinery.
When selecting the right motor, load characteristics, starting method, environmental conditions, operating time and drive arrangement should be assessed together.
16. Crusher and Heavy-Duty Series – Extra-Strong Motors
Crushing and screening plants, crushers, mills, heavy conveyors and similar machines are applications where sudden shocks, high starting torque and continuous loading are common. In these conditions, a DRG Crusher and Heavy-Duty Series motor selected for the actual operating conditions is the appropriate choice.
This series provides extra-strong motor options designed to support power continuity in demanding-duty conditions. Depending on the product series and frame size, the following advantages stand out:
options suitable for S1 continuous duty,
IE3 and IE4 high-efficiency classes,
100% copper windings and VPI vacuum pressure impregnation,
robust cast-iron housing for shock loads and vibration-intensive operation,
standard NU cylindrical roller bearings on large frames for high radial loads,
standard PTC thermistor protection on large frames to monitor winding temperature,
reliable bearing support for belt-and-pulley drives and heavy rotor loads,
cooling and mechanical construction suitable for long-term demanding operation.
For crusher applications, motor power should be determined not only by the machine’s nominal capacity but also by material type, feed rate, belt-and-pulley ratio, flywheel effect, initial starting torque and possible jamming loads. Therefore, power rating, speed, NU bearings, PTC protection and the starting method should be selected with the technical team for every heavy-duty application.
17. Use with Variable-Frequency Drives and Automation Systems
With the correct motor and drive selection, DRG motors can be used with variable-frequency drives (VFDs). Variable-speed operation helps to:
adjust process speed precisely,
match energy use to demand in pump and fan applications,
reduce mechanical stress through soft starting,
enable more controlled operation with automation systems.
For long-term low-speed operation, high switching frequency or a wide speed range, additional requirements such as a forced fan, insulated bearings or special insulation should be evaluated.
18. End-of-Line Quality Controls
DRG motors undergo electrical and mechanical checks before shipment. Depending on the product and series, these controls include:
winding-resistance measurement,
insulation-resistance and high-voltage checks,
no-load current test,
rotation direction and speed control,
sound and vibration checks,
mechanical dimension and mounting inspections,
rating-plate and serial-number verification,
efficiency and performance verification tests.
19. Production in Line with Applicable Standards
DRG motors are produced with consideration for IEC 60034, CE, ISO 9001 and the relevant electric-motor standards, according to product series and market requirements. Current efficiency and conformity requirements are applied for IE-class motors.
If technical documents, test reports or compliance with a project-specific standard are required, they should be requested before ordering.
20. Technical Support for Correct Motor Selection
An incorrectly selected motor can lead to unnecessary energy consumption, overheating, starting difficulties or mechanical failure. DRG MOTOR does more than supply products; it also provides technical support to help identify the motor suitable for each application.
Selection considers:
required power and torque,
speed,
supply voltage and frequency,
mounting arrangement,
direct-on-line, star-delta, soft-starter or VFD starting,
ambient temperature and altitude,
duty cycle,
belt-and-pulley, coupling or gearbox connection,
PTC, NU bearings, brake, forced ventilation and other special features.
21. Strong Price-Performance Balance
DRG MOTOR aims not only to offer a competitive purchase price, but also to provide a strong total-cost-of-ownership advantage when material quality, energy efficiency, maintenance requirements and operating continuity are considered together.
A correctly selected, efficient and durable motor helps to:
reduce the risk of unplanned downtime,
control energy costs,
improve maintenance intervals,
protect the production continuity of the machine.
22. Fast Supply and After-Sales Support Across Türkiye
With a broad product range and a technical-support approach, standard motor needs can be addressed quickly. Support is available across Türkiye for shipping, product selection, mounting compatibility and after-sales matters. During the quotation process, technical specifications are checked together to ensure that the motor matches the required power, speed and mounting arrangement.
Explore DRG Motor Product Groups
Explore the product group suitable for your application:
Why DRG MOTOR at a Glance
100% copper windings
VPI vacuum pressure impregnation
Durable cast-iron housing
Standard NU bearings on large-frame and high-power motors
Standard PTC thermistors on large-frame and high-power motors
IE3, IE4 and IE5 high-efficiency options
Class F insulation and IP55 protection
SKF, NSK or C&U bearing options
Low vibration and smooth operation
Wide power, speed and mounting range
Extra-strong motor options for crushers and heavy-duty applications
Structure suitable for demanding industrial use
End-of-line electrical and mechanical checks
Technical selection and after-sales support
A strong price-performance balance that combines quality with competitive pricing
Frequently Asked Questions
Do DRG motors use copper or aluminium windings?
DRG motors use 100% copper windings. Copper windings provide high conductivity, lower electrical losses and controlled operating temperature.
What is an NU bearing and on which DRG motors is it standard?
An NU bearing is a cylindrical roller bearing with high radial-load capacity. It is used as standard in DRG motors from certain larger frame sizes and power ratings upward. The exact threshold is confirmed from the technical data sheet based on motor power, pole number, frame size and product series.
What is PTC protection and on which DRG motors is it included?
PTC is a thermistor that monitors motor winding temperature. It is standard on DRG motors from certain larger frame sizes and power ratings upward. Used with a thermistor relay or a suitable drive input, it can provide an alarm or stop signal in an overtemperature condition. The exact threshold is confirmed according to the product series.
Do DRG motors feature VPI impregnation?
Yes. DRG motor windings use VPI vacuum pressure impregnation. This process supports winding integrity, insulation strength and operational reliability in vibration-intensive environments.
Which efficiency classes are available from DRG MOTOR?
Motor options are available in IE3, IE4 and IE5 efficiency classes according to the product series and application.
What power, speed and mounting options are available?
DRG motors can be supplied from 0.25 to 355 kW, with 1,000, 1,500 and 3,000 rpm options, and in B3, B5, B14, B34 and B35 mounting arrangements.
Can DRG motors be used with a variable-frequency drive?
They can be used with a VFD when the appropriate motor and drive are selected. For a wide speed range, continuous low-speed operation or high switching frequency, required additional equipment should be assessed by the technical team.
What should be considered when selecting a crusher or heavy-duty motor?
Required power, speed, starting torque, material and feed conditions, belt-and-pulley load, duty cycle, ambient conditions and starting method should all be considered. NU bearing and PTC requirements must also be checked for the selected motor.
What information is needed to select a motor?
Power, speed, voltage, frequency, mounting arrangement, duty cycle, environmental conditions, starting method and the load characteristics of the driven machine should be known. For belt-and-pulley or heavy shock-load applications, radial load and bearing configuration should also be checked.
Quotation and Technical Information
Contact us for the DRG motor best suited to your application, stock availability and pricing information.
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DRG MOTOR – Quality production, strong performance, competitive price.