What Is The Advantage Of The Wound-Rotor Over The Squirrel-Cage Motor?

What Is the Advantage of the Wound-Rotor Over the Squirrel-Cage Motor?

The wound-rotor motor addresses these issues better than the squirrel-cage motor. This type of motor requires lower inrush current at the start-up phase, and starts up with a higher starting torque than its counterparts. This pullout torque is also enhanced by the wound-rotor design, making it an efficient speed-controlling motor.

Variable-speed drives

When comparing the wound-rotor and squirrel cage motor, the latter offers more energy efficiency. However, the wound-rotor is more expensive to manufacture and has fewer advantages over the former. For this reason, VSDs are not ideal for high-speed applications. These motors are not recommended for hazardous environments. In such areas, special equipment must be used.

The wound-rotor motor has greater starting torque and low starting current, making it better for applications where inrush currents are problematic. Unlike squirrel cage motors, wound-rotor motors’ speed and torque characteristics can be altered by varying the external resistance. The squirrel cage motor, on the other hand, has fixed characteristics and is not suitable for variable-speed applications.

A wound-rotor motor is also more efficient for variable-speed applications. It consumes less power, and can start at a lower speed than the squirrel cage motor. It also has a higher capacity for overloading than the squirrel cage motor and has a lower starting current than its counterpart. It is also better for applications with inertial loads, as the wound-rotor motor develops high starting torque at standstill and low inrush current.

Another type of adjustable-speed drive is the slip-controlled adjustable speed drive. This type of drive uses slip rings in the external circuit to transfer torque to the output rotor. However, these slip rings can result in a low starting torque and high inrush current, causing the motor to fail. Furthermore, the slip-ring design can be prone to damage, including from heat, vibration, or centrifugal force.

More expensive

If you’re looking for a high-quality AC motor, consider a squirrel cage induction motor. These motors are popular because they’re inexpensive, robust, efficient, and reliable. You can also look into slip ring motors, which cost more, but have very few advantages. Slip ring motors are prone to copper losses and require frequent maintenance. This article will discuss the advantages and disadvantages of squirrel cage induction motors and help you choose the best one for your needs.

There are many types of induction and squirrel cage motors. They can be classified by size and torque, and are rated by the International Electrotechnical Commission (IEC). Single-phase motors need an initial “shove” to start, while three-phase motors have synchronous speeds. Single-phase motors do not have these features. These motors can run on either a single-phase or three-phase power supply.

A squirrel cage motor uses a semi-closed rotor containing a core of copper or aluminium. The rotor has slots that are not parallel, which reduces humming and offers smooth torque curves. The rotor has a permanent slot at one end. Both types of squirrel cage motors have a rotary core with parallel and skewed slots. The squirrel cage motor is the most efficient of the two.


There are many benefits to a wound-rotor motor. It uses less current, is cheaper, and has a higher starting torque. It also has adjustable speed and torque. It is also more versatile and is often used in low-voltage applications. However, if you’re considering buying one for your home, you should consider what the differences are. Here are some of the main differences between squirrel cage and wound-rotor motors.

First, a wound-rotor motor is more complex. The secondary circuit introduces more possibilities for errors. In addition, the slip-ring brushes are more prone to sparking, resulting in an increased fire risk. This lowers the overall efficiency of the motor, which is another disadvantage. The wound-rotor motor is also less efficient than the squirrel-cage motor.

While the squirrel-cage motor is less expensive, it’s a better choice for some applications. The squirrel-cage motor is ideal for applications that require low torque or high torque. It’s easy to install and relatively low cost compared to a wound-rotor motor. Compared to an induction motor, it requires less maintenance and is more affordable. A wound-rotor motor has more internal resistance, which can affect its efficiency.

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