How to Save Money When Buying PMSM Motor Manufacturers

Produced by Nidec Motor Corporation, U.S. MOTORS® brand permanent magnet AC motors provide the high efficiency and reliability that come from over a century of experience in manufacturing motors. Our innovative engineering teams excel at designing permanent magnet AC motors to save companies time and money in both energy and maintenance costs.

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We have a passion for building things that spin and move ' and that shows in the high-quality motors we produce. We build our motors to stand up to the demanding tasks that are required in the commercial, industrial, HVACR and other applications where they are widely used. This results in permanent magnet motors you can depend on when you need them most.

Permanent Magnet Motor applications 

• Pool motors
• RESCUE Ecotech HVAC motors

U.S. MOTORS brand permanent magnet motors pack a powerful punch at a variety of sizes and horsepower levels. We can meet your company's requirements whether through a product we already offer or one we design specifically for you. If you have a unique motor requirement that is not addressed by Nidec Motor Corporation's stock of permanent magnet AC motors, our talented engineering teams can customize a product or system to meet your exact specifications.

Brushless DC motors (BLDC) are widely used in industries such as industrial automation, automobiles, medical equipment, and artificial intelligence due to their long life, low noise, and high torque. BLDC has a variety of specifications and types, and in practical applications, it is necessary to select a suitable brushless DC motor to meet the performance requirements of the application product. Motor selection is the process by which engineers select a motor for a given application. This is a system-level analysis process in which engineers will repeatedly evaluate the available motor options based on the application's goals and design constraints. In essence, the process follows an engineering "design spiral" to find a motor that meets the application requirements.

Guided by the target application, the main aspects to consider when selecting a BLDC motor include: motor type, torque requirements, speed requirements, power requirements, total motor cost, and application scale limitations.

01 Choose the Right Motor Type

From the perspective of structure, brushless DC motors can be divided into two types: inner rotor and outer rotor. Fundamentally, they work on the same principle, but have different advantages and limitations.

An outer rotor motor places the stator inside and the rotor outside, rotating around the central stator. An inner rotor motor has the opposite design: the stator (stationary element) is placed outside and the rotor (rotating element) is placed inside, rotating inside the stator.

Relatively speaking, the outer rotor brushless motor has a larger diameter and better heat dissipation, which is conducive to the use of low-speed torque and is suitable for low-speed applications; while the inner rotor brushless motor has a small diameter and a faster speed, and is more suitable for high-speed applications.

BLDC motors are also divided into sensored motors and sensorless motors, depending on whether they are equipped with sensors or not.

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Sensored motors use Hall sensors embedded in the motor stator. The Hall sensor is essentially a switch whose digital output is equivalent to the sensed magnetic field polarity (i.e. HI represents north and LO represents south). Sensorless motors are brushless DC motors without the Hall sensors. 

The choice of sensored or sensorless motors usually depends on cost. Sensorless motors reduce the cost of sensor hardware, wiring, and manufacturing by removing the Hall sensors. At the same time, sensorless motors have a higher manufacturing yield rate - close to 100%. Therefore, more and more applications are beginning to use sensorless motors, such as low-cost variable speed motor applications such as fans, refrigerator compressors, air conditioners, and gardening tools. However, applications that require high torque at startup, such as electric tools such as electric bicycles and electric scooters, require sensored motors.

In addition, from the material point of view, high efficiency, low price, low temperature rise ferrite BLDC motor is preferred. Only when the performance requirements are strict, the volume is small, and the ambient temperature is high, should AlNiCo BLDC motor or rare earth BLDC motor be considered.

02 Identify Application Design Constraints

This is the most important part. The first task in selecting a motor is to identify the application requirements and limitations. Only by getting the direction right can you avoid wasted effort.

'Clearly Define the Application Goals

For different applications, brushless DC motors have different designs and drive methods, which makes the selection very complicated. In order to simplify the motor selection, we need to determine the core requirements based on the motor's purpose.

'Economic Considerations

Brushless motors are the longest-lasting motors, but they are not the lowest-cost motors in the world. If your project is very price-sensitive, you can still use a BLDC motor, but you may save money by using a brushed DC motor. But in the long run, brushless motor controllers have an average life of 5 times longer than standard DC motors. At the same time, brushless motor systems maintain stable performance over a long service life, so they may be the most cost-effective over the entire project life cycle. When making a decision, you must consider the trade-offs between life, performance, and cost, as well as the importance or value that important characteristics such as constant speed under variable load have.

'Size Restrictions

Before buying or using a motor, you should determine the size of the motor. Most of the time, manufacturers use a standard 4-digit naming scheme for motors. For example, a motor named , where the first two digits represent the diameter of the stator (in millimeters) and the last two digits represent the height (in millimeters). If either of these two numbers is larger, the motor will handle more power and thus produce more torque. If the number is still large after weighing the pros and cons, it is called a heavier/larger motor. The following are some commonly used motor sizes. By matching them with the corresponding drones, everyone can understand the difference between these sizes more vividly.

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