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How to Choose an Electric Motor

There are various factors to consider when selecting an electric motor to ensure you obtain the best driving solution for your product.

We intend to give a reference point for selecting your electric motor with the guidance below, which covers factors of motor architecture such as torque, duty cycle, temperature limitations, and efficiency.

What is an Electric Motor?

Electrical energy is converted into mechanical energy by an electric motor. The concept of electromagnetic induction is used to accomplish this. When a current-carrying conductor is placed in a magnetic field, a force is produced on it that is proportional to the current flowing and the strength of the magnetic field.

Oersted, Gauss, and Faraday developed the fundamental principles of electromagnetic induction in the early 1800s. Tesla, on the other hand, was able to take motor technology to the next level in the late 1800s, as well as revolutionize motor manufacturing. Tesla was able to get 900 patents in the electrical sector, many of which were relevant to motor applications.

What Factor Should You Consider While Selecting an Electric Motor?

When looking for the ideal electric motor, keep the following factors in mind:

Power requirement: 

The speed and torque required for the application dictate power, which is not always easy for customers to assess in complicated applications. The first step in selecting and optimizing an electric motor and gearbox for a client product is to measure or calculate the application’s requirements.


Once you’ve determined the needed torque, you’ll need to figure out how fast you need to go. The speed is measured in rad/s; however, the formulae below account for this and use the more common RPM.

The computed mechanical power is a decent indicator of the motor gearbox size that is required, but it is only an indication since the same motor speed watts can be produced in either a ‘low speed with high torque or a ‘high speed with low torque’ arrangement.

Torque Speed Graphs:

Torque Speed Graphs are a useful tool when selecting an electric motor since they provide details from the electric motor gearbox manufacturer on the product’s performance. They show the nuances of the electric motor or motor and gearbox efficiency by displaying torque output at all speeds, most often near stall.

With these basic motor gearbox Torque Speed Graphs and the torque and speed calculated for the application, it is feasible to verify if the appropriate choices gearbox can drive the implementation at all speeds required, as well as how much torque is still available if needed.


Efficiency is a critical consideration when selecting an electric motor. The efficiency of both the motor and the gearbox, as well as the combined efficiency, is a separate subject, but in most cases, more than the performance variables must be considered in the selection process.


Electric motor systems are thought to account for 46 per cent of global power usage. Electric motors are widely used in industry. Pumps, compressors, and conveyors are driven, while fans, blowers, drills, and mixers are operated. Electric motors are at the heart of the manufacturing process.

HZPT has extensive expertise in designing and producing various motor and gearbox technologies, as well as evaluating the trade-offs between them in various applications. Our vast expertise in providing a wide range of sectors allows us to immediately discuss the best technology for the job.


About HZPT

Hangzhou Ever-power Transmission Co., Ltd.
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As one of the leading manufacturers, suppliers, and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chains, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors, and many other products.

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