Three-phase asynchronous motors with digital layer

The right solution for starting three-phase asynchronous motors

Three-phase asynchronous motors are currently the most widely used electric motors in industry. To start and control them, a wide range of products and options are available, from simple contactor/circuit-breaker combinations to soft starters and frequency inverters.

How can you select the best solution for your motor starting application?

What determines your most optimal motor start type?

Different solutions are used for starting motors in applications such as pumps, ventilation, compression, conveying and processing, since there are different challenges in the individual applications. For example, the control of the starting torque or the starting time, when it comes to challenges like damage due to blocking or overload.


When selecting and designing the motor start, the electrical planner must consider not only the technical specifications of the application but also the economic and legal framework conditions.


The type of starting depends upon the branch circuit protection used for the motor, such as:

  • direct and reversing start
  • star-delta start
  • soft start
  • variable speed control

Learn about motor starting basics in our free white paper "Starting Motors". "Starting Motors" will provide you with the information necessary to choose the right technology for your application. It provides an overview of the common applications for electric motors, provides the criteria necessary to select the starting type, and explains current industry trends - such as energy efficiency and digitalization.


Upon completion of reading, "Starting Motors", you will know the basic criteria necessary to select the type of motor start, such as: Motor performance, starting current and starting time as well as new technology that could be implemented into your application.

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