What are the most important aspects when choosing DC or AC motors?

Before a purchase manager begins the ask of choosing DC motors for a project, he should be well aware of the main specifications of the application. These specifications are:

  • Type of start-up

We should analyses the amount and characteristics of start-ups. There are machines that require a starting power that a motor may not be able to provide.

  • Load

Here we will consider its operation with or without a load. When bearing a load, the motor is dragging an object or bearing an external resistance (the load) which forces it to absorb mechanical energy. Therefore, in this case, the torque resistance results from internal and external factors. When a motor operates without a load, it does not pull any object, neither does it bear any sort of external resistance. The shaft rotates freely and any resistance results from internal factors.

  • Torque

This information specifies the motor’s driving ability. This parameter will be key on any application where we intend to create a motion or displacement.

  • Electrical power used by the motor (in kW)

When efficiency is a key factor for your project, you should calculate the electrical power used by the motor during its operation.

  • Performance

You should analyses energy losses on the motor resulting from external (humidity, ambient temperature, material properties, etc.) and internal (material properties, brushed or brush less motors) factors.

  • Variations in, and progression of, the rotational speed

There are many aspects that may condition the rotational speed. If our application needs to work at various speeds, we should choose actuation solutions that are highly versatile.

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