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Brushless DC Motors vs Stepper Motors

Views: 9     Author: Site Editor     Publish Time: 2023-05-19      Origin: Site

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Brushless DC motor is a high performance motor, its biggest feature is that it has the external characteristics of DC motor but without the traditional contact commutators and brushes. It uses a permanent magnet rotor with no excitation losses. The heat generating armature windings are mounted on the stator outside, so heat dissipation is easy. Therefore, brushless DC motor has the advantages of no commutation sparks, no radio interference, long life, reliable operation and easy maintenance, etc.

Stepper motor is an open-loop control device that converts electrical pulse signals into angular or linear displacements. Under non-overload conditions, the motor's speed and stop position depend only on the frequency and number of pulses of the pulse signal, regardless of load changes.

Stepper motors can also be classified as brushless DC motors because stepper motors do not have commutation carbon brushes. A stepper motor is a specific term, while a brushless DC motor is a general term. A stepper motor may be a reluctance motor or a permanent magnet synchronous motor. Stepping is an open loop control method and the motor can be controlled in other ways.

Introduction Of Stepper Motors

A stepper motor is an actuator that converts digital pulse signals into angular displacements. That is to say, when the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (ie step angle, step angle) in the set direction. You can control the angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, you can control the speed and acceleration of the motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation.
Every step of the stepper motor is very precise, and it is repeatable, so the position of the motor can be precisely controlled without any feedback. For example optical encoders. only by tracking Input step pulse. It is one of the most versatile forms of positioning systems. they are usually numbers Controlling as part of an open-loop system is simpler and more robust than a closed-loop servo system.Industrial applications include high-speed pick-and-place equipment and multi-axis CNC machines, often directly Drive screw or ball screw. Stepper motors can be used in different fields, in the field of optics, they are often used for precise positioning equipment such as linear actuators, linear stages, rotary stages, goniometers, and mirror mounts. Other uses are in packaging machinery, and in the positioning of valve pilot stages in fluid control systems. business, stepping motors are used in floppy disk drives, flatbed scanners, computer printers, plotters, image scanners, optical drives, and more.

Introduction of Brushless Dc Motors

Brushless motors are widely used in industries such as AI intelligence, automobiles, medical equipment, and industrial automation due to their long life, low noise, and high torque. Because of their different specifications and types, how to choose a brushless motor depends on It is very important to meet product performance requirements. In this article, we will introduce several principles for selecting brushless motors.

Brushless motor is also a kind of equipment commonly used in industrial production in recent years. There are many models of this equipment to choose from on the market. The models of the products are different, but the others are the same. What about suitable electrical equipment?

The structural specifications of brushless motors include planetary gearboxes, cylindrical gearboxes, parallel spur gearboxes, and worm gearboxes;

The material level is divided into metal structure and plastic structure; the power level is divided into high-power and low-power brushless motors.

1. Determine the motor’s use path, application scenario, environmental requirements, working temperature and other factors before purchasing.

2. First determine what kind of motor is needed, such as low power, high torque, low speed, noise, power, parameters and other power and performance requirements.

3. Determine the torsion stone, installation method and maintenance method of the output shaft.

4. Determine the rotation speed and reduction ratio of the input transmission shaft.

5. Select a brushless motor according to the size of the flange of the machine. If the output shaft drags the hammer insufficiently, return to 2 and re-match.

Brushless motors of different specifications and models have different usage territories and usage characteristics. Therefore, we must understand our own needs clearly before purchasing, and do not buy blindly.


Differences in the characteristics between stepper motors and brushless dc motors

1. Stepper motors have a relatively large torque, especially at low speeds. Brushless DC motors have a large starting torque, and the torque is proportional to the armature current, which is relatively large at medium to high speeds.


2. The rotation speed of stepper motors is in proportion to the input pulse frequency. Stepper motors have a high torque in the low speed range, and a reduced torque in the high speed range that results in a loss of step. Stepper motors are a kind of low speed and high torque motors


3. The rotational speed and position of stepper motors are controlled by open-loop command pulses, which do not require feedback circuit, but they suffer from out-of-step problems. Brushless DC motors require speed control for constant speed rotation, through feedback from speed sensors to control speed. Since the torque is proportional to the current, it is easy to control the torque of brushless DC motors.


4. The working life of stepper motors is determined by the bearing life, which can reach tens of thousands of hours. The working life of brushless DC motors is also determined by the bearing life, but can reach tens of thousands to hundreds of thousands of hours.


5. Stepper motors are mostly available in mounting sizes with industry standards, which are easier to obtain and have more varieties. However, brushless DC motors are mostly customized for specific applications in the industry and basically do not have industry standard sizes.


6. Stepper motors have more noise and vibration compared to brushless DC motors, especially at low speeds.


7. Stepper motors are less expensive than brushless DC motors because they usually do not require a feedback sensor. But brushless motors need a position sensor.


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