How to Make a Choice About DC vs Stepper vs Servo Motors?

Nowadays, the application of motors is more and more extensive, and the selection of motors is also becoming more and more. Faced with different applications, you should choose the right motor for your application. Each type of motor has different basic information and important parameters, so when you are choosing electricity, you need to understand the parameters of different motors so that you can choose the most suitable motor for your application. The following will introduce you the basic information of the three types of motors to help you make a better choice.

The types of motors:

Brushed DC Motors

A brushed DC motor is a type of DC motor. This type of motor is widely used and can be found almost anywhere, such as toys, household fans, motor cooling fans, and so on. The stator of the brush motor is equipped with fixed main magnetic poles and brushes, and the rotor is equipped with armature windings and commutators. The electrical energy of the DC power supply enters the armature winding through the brushes and the commutator to generate an armature current. The magnetic field generated by the armature current interacts with the main magnetic field to generate electromagnetic torque, which causes the motor to rotate and drive the load. The control of the brushed motor is simple and can achieve high torque at low speed. The brush motor is low in cost but has a high efficiency of about 75%-80%. But brushed motors also have limitations. The brushed motor will produce a certain amount of noise and the brush is easy to wear due to the continuous moving contact, so it needs frequent maintenance.

Brushless DC Motors

The brushless DC motor is also a kind of DC motor, which is composed of the motor body and the driver. Brushless motor refers to the motor without brush and commutator, also known as the motor without commutator. Brushless DC motors have more advantages than brushed DC motors. Brushless DC motors produce less noise than brushed motors. In addition, brushless DC motors are also more efficient than brushed DC motors. As the name suggests, brushless DC motors do not need to replace brushes, so brushless motors are more durable than brushed DC motors. Although brushless DC motors have many advantages, they also have certain limitations. Some brushless DC motors are usually difficult to control, so special regulators are required. And the brushless DC motors price is higher than that of brushed DC motors.

Stepper Motors

A stepping motor is a motor that converts electrical pulse signals into corresponding angular displacements or linear displacements. Each time a pulse signal is input, the rotor rotates by an angle or one step forward. The output angular displacement or linear displacement is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. The stepper motor can usually be positioned accurately, so it has many applications, such as desktop printers, CNC milling machines. The stepper motor has the maximum torque at low speed and can be applied to applications that require low speed and high precision. And stepping motors can be easily controlled by some microcontrollers. At the same time, stepper motors also have some limitations. For example, stepper motors produce a certain amount of noise during operation, and the torque generated by stepper motors at high speeds is smaller than that at low speeds. Unlike DC motors, stepper motors need to use the maximum current, so stepper motors tend to be very hot, which means that such motors have lower efficiency.

Servo Motors

Servo motor is a closed-loop system, which refers to the engine that controls the operation of mechanical components in the servo system. The servo motor can control the speed, and the position accuracy is very accurate. Servo motors have different sizes and torque ratings, so there are many options for servo motors. The servo motor has the characteristics of high efficiency, high precision, and can produce high torque at high speed. Regarding the limitations of the servo motor, the servo motor has a limited range of motion, and the position rotation servo system can only rotate 180 degrees. And the servo motor price is relatively high.

Through the above introduction to the three types of motors, each motor has its advantages and disadvantages. So when you consider buying a suitable motor for your project, you need to consider the parameter variables and advantages and disadvantages of each motor, so as to avoid the high cost of choosing the wrong motor. If you want to buy a high quality servo motor, Ouke is a company that provides professional sales and maintenance of automation equipment like Siemens servo drive, Mitsubishi servo motor, Fanuc servo drive, Fanuc servo motor encoder, Fanuc circuit boards, Fanuc teach pendants etc. For more detailed information about the motor, you can consult Ouke.