Still, you may wonder, how can slip ring motors help you solve your design requirements?
In this guide, you will discover everything you need to know about the working of slip ring motors. It will also give you a comparative between slip ring and squirrel cage induction motors.
Without further ado, let’s dive in.
Let’s start at the beginning.
An induction motor has two main parts: the stator and the rotor. The stator is the static part of an induction motor, while the rotor is the part that rotates.
The difference between a squirrel cage and slip ring induction motor lies in the rotor.
In a three-phase slip ring induction motor, the rotor has a three-phase winding on the wound.
Each terminal of the winding connects to separate slip rings. The slip rings allow the insertion of impedance (resistance) into the circuit.
This is how a slip ring induction motor diagram looks like:
As a result of the added resistance, the rotor’s current is more in phase with the stator’s current. This creates a bigger torque from the starting.
The slip ring motor construction allows the slip ring to control the output of the motor.
When you start a 3 phase slip ring induction motor, the poles of the stator create a rotating magnetic field, just as in any induction motor.
It is the slip ring rotor with the added external resistance what makes the difference.
When the currents of both the rotor and the stator are more in phase, we obtain a bigger torque. Also, the external resistance, added by the slip rings, lowers the starting current demand.
A slip ring is a device that can transmit power, electrical signals or data from a static source to a rotating one.
In a motor, a slip ring commutator maintains the connection between the rotor and the stator
Slip rings are typically made of conductive materials, such as cooper or gold alloys. Sometimes they are manufactured with silver or coin silver.
In this case, slip rings for induction motor are made of copper or copper alloys.
Slip rings are fundamental for many industries.
The machines used to bottle your milk? They use slip rings. And the International Space Station? It has slip rings to help it control the solar panels that power the station.
At Moflon, we pride ourselves in providing top-quality slip rings and innovative technology in the field.
There are plenty of places where you can find slip ring motors.
Some of the most common are cranes, mills, hoists, and conveyors. All these enjoy the slip ring advantages such as:
Okay, so if slip ring motors are so cool, then why even bother with squirrel cages?
Well, there are some things to consider, of course.
One of the major issues with slip ring motors is that they are more costly to maintain than squirrel cage. This is mainly due to the wearing of the brushes of the slip rings.
A slip ring motor is also less efficient with light loads compared to the squirrel cage motor, and are sensitive to voltage fluctuations.
The most important thing to look at is the size of your load. If you have a high-inertia load, your best bet is to use the slip ring motor.
Slip rings motors are also the absolute go-to if you need to be able to control the speed of the motor.
Each motor has its own application. We can still compare some of its features to help you understand the difference between them a little bit better.
The most important thing is to keep in mind your project’s needs.
Take in consideration everything you’ve learned today and decide what’s best for you and your project.
Even when they are not the best fit for every project, slip ring motors are an amazing tool. They power gigantic machines and solve problems that the alternative simply can’t.
There you have it, all there is to know about slip rings. Or all you’ll need to make a good decision, anyway.
What are your thoughts on the advantages of using slip ring motors? Did we miss anything?
Let us know in the comments.
Do you still have questions about the benefits of slip ring motors? Contact us to talk with one of our experts!
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