Find out how you can efficiently control speeds with pole-switchable motors and save costs.
What is a pole-switchable motor?
Ein pole-switchable motor is an electric motor designed for operation with two or three fixed speeds This is achieved by changing the number of poles in the motor, allowing speed adjustment without a frequency converter.
How does the Dahlander circuit work in pole-switchable motors?
The Dahlander circuit is a special winding configuration that allows a pole-switchable motor to change the speed in a ratio of 1:2, e.g., 1500/3000 rpm. It utilizes the entire winding optimally at both speeds, often in a delta/star connection (Δ/YY).
When are pole-switchable motors with separate windings used?
Pole-switchable motors with separate windings are used when speed ratios different from 1:2 are required (e.g., 1000/1500 rpm). Each speed level has its own winding system in the stator.
For which applications are pole-switchable motors particularly well suited?
They are ideal for applications with few fixed speed levels such as in fans, pumps, conveyors, or hoists (fast/creeping speed). ATEK Drive Solutions often integrates these drives into custom system solutions..
Are pole-switchable motors energy-efficient?
Pole-switchable motors They may be exempt from the strict IE efficiency classes (IE3/IE4) under certain operating conditions (e.g., short-term operation at one level) and can legally operate with IE1 or IE2. This can save costs,, but requires careful examination of the application.
Can pole-switchable motors be adapted to specific requirements?
Ja, Pole-switchable motors offer extensive modification options. ATEK Drive Solutions, for example, adjusts voltage, shaft dimensions, flanges or the position of the terminal box and integrates brakes or external fans for optimal system integration..
What are the advantages of pole-switchable motors compared to frequency converters?
In applications that require only a few fixed speeds, they offer Pole-switchable motors oft lower acquisition and installation costs (up to 25% savings possible according to application examples), a higher robustness and a simpler control compared to frequency converter systems.
What should be considered when selecting a pole-switchable motor?
Important criteria are the required power and speed per level,, voltage, frequency, design (e.g., B3, B5), protection class (e.g., IP55), and the torque behavior of the application (constant or quadratic). Compliance with standards such as DIN EN 60034-8 is also important.
Pole-switchable motors allow two or three fixed speeds and can reduce investment costs by up to 25% in suitable applications. Investitionskosten um bis zu 25 % senken compared to frequency converter systems.
The choice between Dahlander circuit (1:2 speed ratio) und motors with separate windings (flexible ratios) depends on the load profile; the correct winding configuration (e.g., Δ/YY for constant torque) is crucial for optimal performance and efficiency..
Through extensive modification options and consideration of IE exemptions, they offer Pole-switchable motors a robust, often cost-effective drive solution for specific industrial requirements, which ATEK Drive Solutions realizes in a customized manner.Discover the advantages of pole-switchable motors for your individual needs. From how they work to their areas of application – we provide you with all the important information.
Are you looking for an efficient way to control speeds in your systems? Pole-switchable motors offer a flexible and cost-effective solution. Contact us at ATEK Drive Solutions for individual advice!
Do you need a tailored drive solution with pole-switchable motors?
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Understanding: What pole-switchable motors can achieve
Pole-switchable motors offer two, occasionally three fixed speeds, thus realizing different process speeds without frequency converters. For example, a fan switches between 750 rpm base load and 1500 rpm full load speed. Their construction ensures robustness and low maintenance. We integrate these drives with switchable pole numbers into overall solutions. More about three-phase motors.
One advantage is often lower acquisition and installation costs compared to frequency converter systems when only a few fixed speeds are needed. For example, a conveyor system for product transport at 0.5 m/s and 1.0 m/s can save pole-switchable motor up to 25% in investment costs. Defined operating points simplify control.Our drive technology offers options.
Contrary to the assumption that they are outdated, robustness and specific advantages secure their place in the industry. For example, in heavy industry or with pumps with two power levels (e.g., 10 kW, 20 kW), such motors with speed levels are often preferred. Fixed speeds are an advantage for suitable applications.Analyze: How Dahlander and separate windings work
The Dahlander circuit achieves a pole-switchable motor speed ratio of 1:2 through a special stator winding arrangement (often Δ/YY), which changes the number of poles. For example, a 4/2-pole motor thus achieves about 1450/2900 rpm (50 Hz). The winding is optimally utilized at both speeds.Information on electric motor speeds.
- The Dahlander circuit enables a speed ratio of 1:2 through a special winding arrangement (often Δ/YY) by changing the pole number of the motor. This is a common method for motors with pole switching..
- In the Dahlander circuit, the stator winding is optimally utilized at both speeds.
- For speed ratios different from 1:2, motors with two or more separate windings are used, each having different pole numbers. Pole-switchable motors Such
- Solche drives with variable pole numbers and separate windings offer high flexibility in choosing different speed levels.
- The specific winding configuration (e.g., Δ/YY for Dahlander, Y/YY) is crucial for the torque behavior of the pole-switchable motor,adapted to load profiles such as constant torque or quadratic torque.
- A careful design of the winding and circuit is necessary to avoid overloads and ensure efficient operation of these motors with speed levels motors.
For other speed ratios, motors with separate windings serve. In the stator, there are independent winding systems with different pole numbers. For example, a 4 and 6-pole winding motor achieves about 1500/1000 rpm. This design is flexible in selecting speed levels. The unused winding should be disconnected.
The winding configuration determines the torque. For constant load torque (conveyors), Δ/YY winding (Dahlander) is often used; for quadratic (pumps, fans) Y/YY for higher starting torque at low speed. Correct design avoids overload and supports efficiency.Understand asynchronous motors.Optimize: Where pole-switchable motors show their strengths
Pole-switchable motors are suitable for fans/pumps with two power levels or hoists with fast/creeping speed. For example, a crane lifts loads quickly (1 m/s) and positions precisely (0.25 m/s). Robustness is advantageous for intermittent operation.
Despite continuous control through frequency converters, motors with fixed speed levels can be more beneficial. With only two/three fixed speeds and a focus on costs, they are often more economical. For example, a ventilation system (off, low 1000 m³/h, high 2000 m³/h) benefits from lower complexity/reliability when using a pole-switchable motor,. These characteristics are often critical.Information on motors with frequency converters.
Target industries include mechanical engineering, packaging, and food industry. For example, a packaging machine processes products at 30/60 cycles/min. ATEK combines these drives with switchable pole numbers mit gear boxes for torque adaptation.. This allows for well-thought-out drive solutions.Select: What to pay attention to in technical data and standards
For the selection of a pole-switchable motor, are relevant characteristics: power (kW) per level, speeds (rpm), voltage (V), frequency (Hz). For example, nameplate: “2.2/3.0 kW – 1420/2850 rpm – 400V”. Design (B3/B5) and protection class (IP55) must be suitable.
- Define the required characteristics per speed level for your pole-switchable motor:Power (kW), speed (rpm), operating voltage (V), and frequency (Hz).
- Choose the appropriate motor design (e.g., B3, B5, B14) and protection class (e.g., IP55) according to the environmental conditions and installation requirements.
- Analyze the required torque behavior of the application (constant load torque for conveyors, quadratically increasing load torque for pumps/fans) to find the right pole-switchable drive. Adjust the winding configuration (e.g., Dahlander Δ/YY or Y/YY, separate windings) to match the load profile and the desired torque characteristics.
- Stimmen Sie die Wicklungsschaltung (z.B. Dahlander Δ/YY oder Y/YY, getrennte Wicklungen) auf das Lastprofil und die gewünschten Drehmomenteigenschaften ab.
- Take into account applicable energy efficiency regulations and check whether exceptions for IE classes (e.g., IE3, IE4) apply to your specific application with a motor with multiple speeds. Pay attention to compliance with relevant standards, such as DIN EN 60034-8, which defines the terminal designations for
- Achten Sie auf die Einhaltung relevanter Normen, wie beispielsweise die DIN EN 60034-8, welche die Klemmenbezeichnungen für Pole-switchable motors .
Torque behavior is important. A pole-switchable motor for blowers (quadratic torque) requires a different design than for conveyors (constant torque). The winding configuration (Δ/YY, Y/YY) is crucial. For example, Y/YY winding delivers higher relative torque at low speed. Tuning to the load profile is necessary for smooth operation.Correctly selecting electric motors.
Energy efficiency: Pole-switchable motors are often exempt from IE classes (IE3/IE4) under special operating conditions, which reduces costs. For example, a motor with short-term operation at level two is often legally permitted to run in IE1/IE2. DIN EN 60034-8 defines terminal designations (1U,1V,1W,2U,2V,2W).Customization: How you can benefit from tailored modifications
Standard motors are not always sufficient. Pole-switchable motors can be customized (voltage, shafts, flanges). For example, stainless steel shafts for the food industry or reinforced bearings for high radial forces (up to 5000 N). Adjustments enable specialized applications.
Modifications are often crucial in mechanical engineering (installation space, environmental conditions, additional components). For example, relocating terminal boxes, installing external fans (up to 60°C), special coatings (RAL 7035) for your customizable motor with pole changing. This allows for optimal integration of the drive into the system.
Modular construction kits and inventory management enable quick customized solutions. A pole-switchable motor motor with brake and fan wheel can often be delivered within 2-3 weeks. Fast availability is an important factor. Consultation on pole-changeable motors is available.
Pole-switchable motors are proven, often cost-effective solutions for fixed speed levels. Considering IE exception regulations can be beneficial. For customized solutions and specific pole-changeable drives individual consultation is recommended.Conclusion: When a pole-switchable motor is the optimal choice
In summary, the pole-changeable motor also plays an important role in drive technology in the age of modern frequency converters. Its strengths lie particularly in applications that require few, clearly defined speed levels and where robustness, simple control, and cost efficiency are paramount. Whether for fans, pumps, hoisting equipment, or special machine functions – drives with switchable pole numbers offer a reliable and economical alternative.
The choice of the right motor with speed levels, whether in Dahlander connection or with separate windings, depends heavily on the specific load profile and operational requirements. The possibility of customization and consideration of energy efficiency standards and their exceptions are also crucial factors for an optimal drive solution. If you are looking for a robust and proven technology for your application with fixed speed levels, a pole-switchable motor is often the superior choice. Contact us for detailed consultation to find the ideal drive for your needs.
