Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Dahlander Motors – Principle, Advantages, Disadvantages
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Electrical Basics > Dahlander Motors – Principle, Advantages, Disadvantages

Dahlander Motors – Principle, Advantages, Disadvantages

In this article, you will learn about the basics of dahlander motors, principle of operation, advantages, and disadvantages.

Last updated: September 28, 2022 2:22 pm
Hussien Ghareb
Electrical Basics
No Comments
Share
5 Min Read
SHARE

You can find a factory with/without a PLC, maybe also there is no a SCADA system in your own factory till this moment.

Contents
Dahlander MotorWhy did Robert Dahlander invent this motor?Principle of Operation for a Dahlander MotorAdvantages and Disadvantages of a Dahlander Motor

But for sure there is no factory that does not contain a “Motors” either it is AC or DC.

A good background in “DC/AC Machines” would be a solid basement for an Electrical/Automation Engineer.

Dahlander Motor

Dahlander Motor

Today we are going to refresh your memories with the Dahlander Motors (need, principle of operation, advantage, and disadvantages) which is a type of multispeed induction motor, so as we always say “lose yourself and the water will lift you up”.

Why did Robert Dahlander invent this motor?

At the beginning of the industrial revolution, there was a huge demand for power and machines to keep up with the industry requirements, that is why a great scientist called Nikola Tesla invented induction motors.

Induction motors have many advantages such as very cheap cost, high efficiency, it has a robust construction that increases their reliability, and finally, we can say that the working principle of an induction motor is very simple and unique.

However, all the advantages mentioned and not mentioned for the Induction motors, there is a serious disadvantage of these motors which is “Constant Speed of Rotation”.

The speed control of the Induction motor is difficult, and here comes the need and power of the Dahlander motor.

Simply we can say a Dahlander motor is the same as an Induction motor except it has a special feature which it can run at two different speeds unlike the Induction motor (Constant speed).

So, we can say that all we need from a Dahlander motor is to be used in some applications that require variable speed motors.

Principle of Operation for a Dahlander Motor

As we said before, a dahlander motor is nothing but a two-speed induction motor, and from the given below equation we can find the speed of an induction motor can be changed by the changing of:

  • Frequency of the power source.
  • The number of poles in the motor winding.

Motor Speed (rpm) = 120 x (F/P)

Where

F is input power frequency in hertz

P is motor poles

The idea behind Dahlander motors is that they can achieve different speeds by switching the configuration of the electrical windings, indirectly adding or removing poles and thus varying the rotor speed.

Dahlander Motor Connections

The poles can be varied at a ratio of 1:2 and thus the speed can be varied at 2:1.

The stator winding of the Dahlander motor consists of six coils. By combing these in different ways, the winding can be given in different numbers of pairs of poles.

Normally, the electrical configuration of windings is varied from a delta connection to a double star connection (or vice versa) in order to change the speed of the motor.

Advantages and Disadvantages of a Dahlander Motor

Pole changing motors are normally used in applications where two-speed controls are necessary.

Some typical applications are:

  • Pumps, wherein two speeds can be used to control the output flow.
  • Fans, to get variable airflow output.
  • Milling applications.
  • Cranes, where two speeds can be used in hoisting applications: one speed for material movement and the other for positioning the material held in the hoist.

The main advantage of the Dahlander motors is that they have a better performance compared to other speed control systems like variable frequency drives, as there is less power loss.

This is because most of the power is used to drive the motor and no electrical pulse switching is done.

The system is much simpler and easier to use compared to other speed control methods available.

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

100 Electronics and Electrical Projects for Engineering Students
Comparison of Electrical Protection Relays
How Motor Star Delta Starter Works ?
What is an Electrical Conduit? – Types – How to Choose?
What is a Protective Relay? Principle, Advantages, Applications
What is Variable Air Volume Controller in HVAC?
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Basic Electrical Engineering Questions & Answers
Contactor – Basics, Wiring, Connection with PLC
What is a Buchholz Relay? Working Principle
Benefits of SIMOCODE over Intelligent MCC
Types of MCB
Difference Between Overcurrent and Overload
What is Megger Test?
Types of Stepper Motors

Keep Learning

Motor STAR - DELTA Working principle

Motor STAR – DELTA Starter Working Principle

Alternating Current

Difference between AC and DC

Difference Between Regenerative and Dynamic Braking

Difference Between Regenerative and Dynamic Braking

Preventive Maintenance of Variable Frequency Drive

Preventive Maintenance of Variable Frequency Drive (VFD)

Capacitor Bank

What is a Capacitor Bank?

De-energized Electrical Circuits

De-energized Electrical Circuits, Networks, and Equipment

Totally Enclosed Fan Cooled (TEFC) Motor

Totally Enclosed Fan Cooled (TEFC) Motors Rampant Winding Burnouts

Single Line Diagram (SLD) Example

Electrical Drawings

Learn More

Encoder Principle

Encoder Working Principle

Move function block

Move Instruction in Tia Portal

ICS Control System

ICS Control System Security

Marking Machine

PLC SCL Program for Marking Machine

Which instrument is faulty

Which Instrument is Faulty? Transmitter, Recorder, or Controller

Instrumentation Lab Viva Questions

Instrumentation Lab Viva Questions

Reading Clock data in PLC

Real-Time Clock in Omron PLC? – CX Programmer

Electrical Machines Questions and Answers

Synchronous Machines EMF Polygon Questions

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?