Learn how to save costs and increase the efficiency of your systems with pole-switchable motors – including application examples and selection criteria.
What is the main advantage of a pole-switchable motor compared to a solution with a frequency converter?
The main advantage often lies in the lower acquisition costs and the simpler, more robust control technology, especially when only two or three fixed speed levels are needed. For such applications, a pole-switchable motor can be a more economical solution .
For which applications are pole-switchable motors particularly suitable?
They are excellent for applications with constant or quadratically increasing counter-torque. Typical examples are fans, blowers, pumps, hoists, conveyors and certain machine tools that operate at just a few, well-defined speeds.
What is meant by a Dahlander circuit and when is it typically used?
The Dahlander circuit is a special winding arrangement that allows for a speed ratio of 1:2 with just one winding (e.g., 1500/3000 RPM). It is often used for two-stage drives , as it is cost-effective and space-saving. ist.
Can ATEK Drive Solutions customize pole-switchable motors to meet specific customer requirements?
Yes, ATEK Drive Solutions specializes in customized drive solutions. Thanks to our modular system design and our expertise, we can customize pole-switchable motors in terms of design, flanges, shafts, brakes, or sensors individually,even for small series.
What speeds and how many stages are achievable with pole-switchable motors?
Typically, two, three, or less commonly four fixed speed levels are achieved. For two stages, the Dahlander circuit (ratio 1:2) or two separate windings are often used. More stages require multiple separate windings or combinations.
How does the energy efficiency of pole-switchable motors compare to IE3/IE4 motors with frequency converters?
Pole-switchable motors often correspond to efficiency class IE1 and are partially exempt from the IE3 standard. Their efficiency is good under nominal operation but can be lower in partial load or at the lower speed level than with modern frequency converter solutions.. A precise consideration of the load profile is critical.
What protective measures are common and recommended for pole-switchable motors?
To protect against overheating, PTC thermistors (NTC thermistors) are often integrated into the motor winding. These allow for reliable temperature monitoring and can shut down the motor in case of a fault, thereby increasing its lifespan. und können den Motor im Fehlerfall abschalten, was die Lebensdauer erhöht.
Does ATEK also offer pole-switchable motors with more than two speeds?
Yes, ATEK can realize pole-switchable motors with three or four speeds. This is typically achieved by using two separate windings or a combination of Dahlander and supplementary windings to meet the specific requirements of the application.
Pole-switchable motors are a cost-effective and robust solution for applications that require two to three fixed speed levels and can reduce the initial investment by 10-20% compared to frequency converters..
The choice between Dahlander circuit (for 1:2 speeds) und separate windings (for more stages/flexibility) is application-specific, with both being ideal for loads such as pumps and fans with defined load profiles. ATEK Drive Solutions offers extensive customization options through
ATEK Drive Solutions bietet durch modular systems, und providing tailor-made pole-switchable motors that enable optimal integration and improved machine performance. und Discover the advantages of pole-switchable motors over frequency converters and find out if this technology is the right choice for your drive requirements.
Are you looking for a cost-effective and reliable solution for applications with discrete speeds? Pole-switchable motors offer an attractive alternative to frequency converters. Contact us at ermöglichen.
Entdecken Sie die Vorteile polumschaltbarer Motoren gegenüber Frequenzumrichtern und finden Sie heraus, ob diese Technologie die richtige Wahl für Ihre Antriebsanforderungen ist.
Sie suchen nach einer kosteneffizienten und zuverlässigen Lösung für Anwendungen mit diskreten Drehzahlen? Polumschaltbare Motoren bieten eine attraktive Alternative zu Frequenzumrichtern. Kontaktieren Sie uns unter ATEK Drive Solutions, to find the optimal drive solution for your needs.
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Understanding the fundamentals of pole-switchable motors
Pole-switchable motors provide an alternative to frequency converters for speed control and can optimize systems as well as reduce costs. Learn more about the operation and selection of this specific type of drive.
Understanding the fundamentals of pole-switchable motors
What exactly are pole-switchable motors?
Ein A pole-switchable motor is a three-phase induction motor whose synchronous speed of the rotating field is varied by changing the number of poles in the stator winding. This allows for stepwise speed settings, for example between 1450 RPM and 2900 RPM, for applications with two or three fixed speeds.
How does the pole switching work?
The pole switching in a pole-switchable motor occurs electromechanically. Several winding sets or a specially switchable winding in the stator represent different pole counts. By strategically connecting these windings to the power source via switches or contactors, the motor achieves different speeds. The low-loss stepwise speed setting is particularly advantageous for frequent changes, such as in pumping drives with two defined flow rates.Getting to know designs and connection variants
Dahlander circuit: Standard for 1:2 speeds.
The Dahlander circuit achieves a speed ratio of 1:2 (e.g., 750/1500 RPM) with a single stator winding. The higher speed is achieved by triangle connection (series), while the lower speed is achieved by double star connection (parallel). ein Drehzahlverhältnis von 1:2 (z.B. 750/1500 U/min) mit einer einzigen Statorwicklung. Die höhere Drehzahl wird durch Dreieckschaltung (Reihe), die niedrigere durch Doppelsternschaltung (parallel) erreicht. This circuit is cost-effective and space-saving.Application for such a pole-switchable motor: Fans with two power levels. Our three-phase motors offer options for this.
- Dahlander circuit: Achieves a speed ratio of 1:2 with a single stator winding in a pole-switchable motor. Functioning of Dahlander:
- High speed through triangle connection (series), low speed through double star connection (parallel). Hohe Drehzahl durch Dreieckschaltung (Reihe), niedrige durch Doppelsternschaltung (parallel).
- Advantages of Dahlander: Is a cost-effective and space-saving solution for motors with switchable pole counts.
- Separate windings: Necessary for speed ratios different from 1:2 or for more than two speeds in a pole-switchable motor..
- Flexibility through separate windings: Allows for three or four speeds, as each winding is designed for a specific pole count and speed.
- Typical application examples: Fans with two power levels (using Dahlander circuit), machine tools with different cutting speeds (using separate windings in a pole-switchable motor.).
Separate windings for extended flexibility
For speed ratios different from 1:2 or more than two speeds, motors with pole switching and two or more separate stator windings are used. Each winding is designed for a specific pole count and speed, allowing for three or four speeds. This design allows for a more flexible speed choice , for example in machine tools that require awith different cutting speeds (e.g., 700, 1000, 1450 RPM). pole-switchable motor. mit unterschiedlichen Schnittgeschwindigkeiten (z.B. 700, 1000, 1450 U/min) benötigen.Select the right motor based on application
Accurately assess load characteristics
Pole-switchable motors are suitable for applications with constant or quadratically increasing counter-torque, such as fans or pumps. Proper matching of motor and load is critical for efficiency. In heavy starting conditions, for example in centrifuges, a A pole-switchable motor motor with high starting torque can start at the low speed level before switching to the operating speed. Such a pole-switchable motor: and robust motor is often a good choice here.
Consider operating modes and energy efficiency
The operating mode (e.g., S1 continuous operation, S3 intermittent operation) affects the choice of drive. Pole-switchable motors are often advantageous in intermittent operation. Although a pole-switchable motor. is often classified in energy efficiency class IE1 (and may be exempt from the IE3 standard), a comparison of efficiencies is important. With predominant operation in the low speed level, a frequency converter may be more economical.If a system runs 80% of the time at the lower level, a motor with frequency converter can save costs in the long run.Carefully weigh the pros and cons
Strengths: Robustness and costs
Lower acquisition costs compared to frequency converter systems, especially in two-stage applications, are advantages of pole-switchable motors. Mechanical robustness and simple control are additional plus points. These motors with switchable pole counts are characterized by longevity and reliability. Operators of hoisting systems/conveyors with two stages use a pole-switchable motor. to reduce maintenance costs.
- Cost advantage: Often lower acquisition costs than frequency converter systems, especially if a A pole-switchable motor is sufficient for applications with two fixed speeds.
- Robustness and simplicity:Pole-switchable motors are known for their mechanical robustness, simple control, and resulting longevity and reliability.
- Maintenance aspects: Can contribute to a reduction in maintenance costs for certain applications, such as hoisting systems or conveyors with two stages, when a pole-switchable motor is used.
- Disadvantage of stepwise control: Speed control in a motor designed for fixed steps is limited; continuous adjustment is not possible. pole-switchable motor: ausgelegt, ist auf feste Stufen beschränkt; eine stufenlose Anpassung ist nicht möglich.
- Disadvantage of efficiency: Energy efficiency can be lower, especially in partial load operation or at the lower speed level, compared to IE3/IE4 motors with frequency converters. This must be considered when selecting a pole-switchable motor. Important consideration:
- A precise analysis of the load profile and operating times at the respective levels is crucial for an informed decision for or against a Eine genaue Analyse des Lastprofils und der Betriebszeiten auf den jeweiligen Stufen ist für eine fundierte Entscheidung für oder gegen einen pole-switchable motor. essential.
Disadvantages: Stepwise operation and specific efficiency
The speed control is at a pole-switchable motor. step; continuous adjustment is not possible. Energy efficiency can be lower (especially at partial load/low speed) than that of IE3/IE4 motors with frequency converters. A precise analysis of the load profile is therefore necessary, before deciding on a pole-switchable motor choice. For sensitive setpoint speed controls, controllable gear motors are better suited.Find suitable manufacturers and individual solutions
Market overview and ATEK offer
Established manufacturers like VEM or NORD offer switchable motors . If you need a specific one, ATEK Drive Solutions as a system provider is a competent partner that combines experience in gearbox construction with expertise in the production of servo motors. pole-switchable motor. Our modular system allows for numerous configurations Unser modulares Baukastensystem ermöglicht zahlreiche Konfigurationen for your pole-switchable motor., high variety of variants, and fast delivery times. Standard motors are quickly adapted for flange B5 or foot-flange B3/B5.
Custom adaptations
ATEK and other manufacturers offer various adaptations for a pole-switchable motor specific need: special flanges, shafts, attachment of brakes, fans, or encoders. We realize customer-specific special solutions even in small series, e.g., a pole-switchable motor: and optimized for packaging machines with special shaft geometry and integrated holding brake according to customer specifications.Recognize and utilize the potential of switchable motors
Optimal areas of application
Pole-switchable motors are a proven, often cost-effective solution for stepwise speed control. Their robustness and simplicity are clear advantages. They are suitable for applications with only a few fixed operating points, where a pole-switchable motor. can demonstrate its strengths. A careful examination of speed levels, load profile, and budget is necessary before deciding on such a motor with switchable pole number is necessary. In two-stage processes, these drives can be more economical than frequency converters.
Future perspectives
Despite the spread of frequency converters, they retain their significance in niches where their specific advantages prevail. The simplicity and reliability offered by a switchable motors is still relevant, especially in price-sensitive markets or for fail-safe applications with simple control. For more complex requirements, advanced A pole-switchable motor drive technology solutions are available. For assistance in selecting the optimal drive, whether it is a
or another solution, contact ATEK Drive Solutions. We will advise you on the most efficient and economical solution for your application. pole-switchable motor. oder eine andere Lösung, kontaktieren Sie ATEK Drive Solutions. Wir beraten Sie zur effizientesten und wirtschaftlichsten Lösung für Ihre Anwendung.
