If you are searching for an electric motor in the market, then you must have an idea about the range of options that it offers. But the problem is that not every type of motor will fit into every situation. So, what are the criteria to have the best electric motor?

Tips for choosing the best electric motor

1. Load characteristics: In simple terms, the load is the amount of work that a tool has to deliver in a unit time. For electric motors, we can divide the type of loads into three categories:

• Constant torque loads: In this type of situation, the load on the motor remains constant throughout its operational time. Conveyors, compressors, positive displacement pumps are some of the examples of it. If your application falls under this category, then all you will have to do is decide on the torque or the horsepower. Once it is known, the size of the motor can be quickly decided.
• Abrupt torque loads: As the name itself suggests, the load on these situations changes abruptly during the operation. Elevators, compactors, batch conveyors are some of the examples of this category. The torque in these cases remains stable for some time and then change within a concise period. If you want to buy a motor for similar situations, then the consideration of both the maximum load and the abrupt change should be taken into account. Also, the speed-toque curve must exceed the load-torque curve of these motors.
• Continuous torque loads: A load of this type changes continuously over time, making it a middle ground between the abrupt and the constant torque load. The loads on fans, blowers, centrifugal pumps, etc. fall into this category. While choosing an electric motor for this kind of application, always target the maximum load point of operation.

Crompton Greaves electric motors are good choices irrespective of the load types. There are various Crompton Greaves electric motor dealers/ distributors in India, owing to its continuously rising popularity.

2. Horsepower: You will need to calculate the required horsepower for your application. You can do so from the formula:

Horsepower= torque* speed/ 5250, where the unit of speed is rpm, and that of torque is lb-ft.

The idea of buying an oversized motor may tempt you, do not go for it.

3. Design types: This one determines the heat withstanding capability of the motors. It is particularly crucial during the starting of the motor and the change of loads. During starting, the inertia of the load must be overcome by the motor. If the load is high, then the initial torque requirement is also very high. It gives rise to a high-temperature situation. Punch presses, crushers, gearboxes are some of the examples. There are four design types according to the initial inertia overpowering criteria, viz. A, B, C, and D. The type B is used as a standard for commercial use.
4. Consider the duty cycle: The duty cycle is the continuous repetition of the starting, operating, and stopping of the motor. The cycle can be a continuous one or an intermittent one. The motors which are used in the periodic duty cycle have a short life because of the frequent encounter with the starting heat.
5. Altitude: The same motor will act differently at different elevations due to the variation in air density. If you are working at a significantly higher altitude, then the temperature rise scale of the motor should be rescaled. The new scale should be considered while buying the electric motor.

Consider all these factors while deciding upon the electric motor. Also, make sure that you buy the product from a trusted dealer. Also, there are several well-known electric motor and diesel engine dealers in India you can trust.