What are alternative techniques for starting a DC motor from rest?

In summary, the conversation discusses different techniques for starting a DC motor from rest. The first method mentioned is using a rheostat, but the individual is looking for alternative techniques that incorporate power electronics. They mention a note that discusses five main types of reduced voltage starters and another that examines three methods and models them on a simulator. The conversation ends with a suggestion to try a Google search for further research.
  • #1
PRoberts1244
1
0
Having been asked to identify two methods of starting a DC motor from rest, I am struggling to get anything on the internet apart from Rheostats. Does anyone know of another technique that can be adopted for DC motor start-up?



no equations required



Knowing that the aramture when the DC motor is running, produces a back EMF that acts in resistance to the applied voltage and this field collapses or is not present once stationary. The problem lies with techniques that resist the applied voltage in order to allow the motor to start running and finally the armature back EMF up and running, therefore eliminating the need of the starter.

Ideally a viable technique would incorporate some form of power electronics. I am not necessarilary lloking for the answers but more of a point in the right direction.
 
Physics news on Phys.org
  • #2
Try a google search. This note says, "There are five main types of reduced voltage starters ..." so might give you some ideas for further research.

http://www.globalspec.com/learnmore/motion_controls/motors/motor_starters_accessories/dc_motor_starters

This note examines three methods, and models them on a simulator. http://www.google.com.au/url?sa=t&rct=j&q=%22dc%20motor%22%20starting&source=web&cd=24&ved=0CFIQFjADOBQ&url=http%3A%2F%2Fwww.ijens.org%2FVol%252011%2520I%252002%2F115302-6464%2520IJECS-IJENS.pdf&ei=dq7gTpC2GeepiAeXrunIBQ&usg=AFQjCNG-ehblBAeLV-DuMSXoYnfNI2X6dw&cad=rja
 
Last edited:

Related to What are alternative techniques for starting a DC motor from rest?

1. What is the purpose of a motor start-up technique?

A motor start-up technique is used to control the starting current and torque of a DC motor. This helps to prevent damage to the motor and its components, and also allows for smoother and more efficient operation.

2. What are the different types of start-up techniques for DC motors?

The two main types of start-up techniques for DC motors are direct start and soft start. Direct start involves connecting the motor directly to a voltage source, while soft start gradually increases the voltage to the motor to reduce the starting current.

3. How does a soft start technique work?

A soft start technique uses a motor controller to gradually increase the voltage and frequency to the motor, allowing it to ramp up to full speed. This reduces the initial surge of current and torque, preventing potential damage to the motor.

4. What are the benefits of using a soft start technique?

Using a soft start technique can extend the lifespan of the motor and its components by reducing wear and tear from high starting currents. It also allows for more precise control of the motor's speed and torque, and can improve energy efficiency.

5. When is it necessary to use a start-up technique for a DC motor?

A start-up technique is typically used for larger DC motors with high starting currents, or in applications where precise control over speed and torque is needed. It may also be necessary when starting the motor under heavy load, or when using a power source with limited capacity.

Similar threads

Engineering Synchronous motor coupled to a DC Compound Motor Problem
    • Engineering and Comp Sci Homework Help
Replies
2
Views
2K
Modelling the voltage measured across a dc motor
    • Electrical Engineering
Replies
19
Views
562
Engineering Electrical Machine - Shunt DC Motor Problem
    • Engineering and Comp Sci Homework Help
2
Replies
41
Views
5K
Engineering Electrical Machines DC Shunt Motor
    • Engineering and Comp Sci Homework Help
Replies
16
Views
3K
Engineering DC Shunt Motor Starting Current
    • Engineering and Comp Sci Homework Help
Replies
1
Views
3K
What is the best DC motor for spinning a vortex impeller at 3000 rpm?
    • Electrical Engineering
Replies
2
Views
999
Engineering How Do You Calculate Armature Current and Efficiency in a DC Shunt Motor?
    • Engineering and Comp Sci Homework Help
Replies
8
Views
6K
Why am I blowing a laptop powerpack with dc water pump?
    • Electrical Engineering
Replies
2
Views
875
Is this a valid way to measure the Back EMF of a DC motor?
    • Mechanical Engineering
Replies
14
Views
4K
Battery Powered Electric Motor and Charging Requirements
    • Electrical Engineering
Replies
5
Views
1K

Hot Threads

Recent Insights

Back
Top