The hollow cup motor is a small DC motor whose working principle is based on the combination of electromagnetic induction and rotational motion. Unlike traditional motors, the hollow cup motor has a unique structural design and is mainly composed of a hollow rotor and a fixed stator. Its core advantages are light weight, small size, high efficiency and fast response, so it has been widely used in various micro devices.
- Basic structure
The hollow cup motor is mainly composed of stator, rotor, sensor components (such as Hall sensor), flange, bearing, yoke and other parts. Among them, the stator is the fixed part, which contains a set of permanent magnets; the rotor is the rotating part, which contains a set of coils, and has a hollow cup structure with permanent magnets inside.
- Working principle
1) Magnetic field generation: When the three-phase coil of the motor is connected to alternating current, the stator coil will generate a rotating magnetic field.
2) Electromagnetic induction: The rotating magnetic field interacts with the magnetic field generated by the permanent magnet of the rotor to generate an electromagnetic torque, causing the rotor to start rotating. When the rotor rotates, the conductive material on its surface cuts the magnetic field generated by the stator coil, further generating electromagnetic induction. The current generated by electromagnetic induction interacts with the magnetic field generated by the stator coil again, continuously generating electromagnetic torque and driving the rotor to continue rotating.
3) Position detection and control: In order to accurately control the rotational position of the motor, Hall sensors are usually used to detect the position of the rotor. Based on the principle of the Hall effect, the Hall sensor can detect the presence and change of the magnetic field to determine the current position of the rotor. According to the signal of the Hall sensor, the control system can accurately control the phase change sequence and speed of the motor to achieve high-precision position control and speed control.
- Speed regulation and control
By changing the frequency and phase of the alternating current passed through the three-phase coil of the motor, the speed and direction of the rotating magnetic field generated by the stator coil can be changed, thereby realizing the speed regulation and steering control of the hollow cup motor. In addition, the use of advanced control algorithms and sensor technology can also achieve more accurate and stable control effects.
- Features and applications
The hollow cup motor has the characteristics of small size, light weight, high speed, high efficiency, and low noise. It is widely used in various precision instruments, medical equipment, household appliances, and humanoid robots. In particular, in applications that require highly precise motion control and positioning, hollow cup motors show incomparable advantages.
The working principle of the coreless motor is based on the principle of the brushless DC motor. Through electromagnetic induction and Hall sensor position detection and control technology, high-precision and high-efficiency drive control is achieved. With the advancement of technology and the upgrading of demand, the coreless motor is expected to play an important role in more fields.
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