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The Difference Between a Sensed Brushless Motor and a Senseless Brushless Motor

The difference between a sensed brushless motor and a senseless brushless motor

The sensor in sensorless brushless refers to the "Hall sensor", so what is "Hall"? Hall refers to the Hall effect. In simple terms, when a current flows through a conductor that is perpendicular to the external magnetic field, a potential difference is created between the two end faces of the conductor that are perpendicular to the magnetic field and the direction of the current. This can be easily determined using the Hall effect. Regardless of the operating state of the motor at high or low speed. It can be seen that the inductive brushless motor is a brushless motor without Hall sensor feedback. It detects the commutation of the rotor position indirectly via the voltage and current changes in the motor winding.

Characteristics of inductive brushless motors and inductive brushless motors

The position of the rotor can be known when the inductive motor is at rest, but the position of the rotor must be rotated for the non-inductive motor. Therefore, the non-inductive motor shakes when it only starts and stops. To summarize, it shakes when starting and stopping. Induction motors use Hall elements, which are less susceptible to interference and more accurate in judgment. Therefore, it can be used for fast starting and stopping conditions. They usually provide better torque performance at low speeds as they can operate accurately at low speeds or even at standstill. Commutation control.

Usage scenarios of sensored brushless motors and sensorless brushless motors

When choosing between an inductive motor and a non-inductive motor, you need to consider the following aspects:
Speed range: If the speed is higher, it is recommended to choose a non-inductive motor; if the speed is lower, it is recommended to choose an inductive motor.
Control accuracy: If high-precision control is required, it is recommended to choose an inductive motor; if the control requirements are relatively low, it is recommended to choose a non-inductive motor.
Cost factor: If the cost requirements are low, it is recommended to choose a non-inductive motor; if the accuracy and operating stability requirements are high, it is recommended to choose an inductive motor.
Control distance: When the distance is less than 3 meters, an inductive motor can be used. When the distance is greater than or equal to 3 meters, it is recommended to use a non-inductive motor.

All in all, non-inductive motors are suitable for applications with small to medium power and high speed operation, such as fans, model toys, etc. Inductive motors are suitable for high-precision and high-power applications, such as machine tools, automation equipment, etc.

Updated on: 28/12/2023

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