Stepper motor synchronous vector servo system-Solutions-åŽå¼ºç”µå网
Various types of motors, including linear motors, can be understood as the result of interaction between the stator and rotor magnetic fields. These two fields remain relatively static but differ in their working angle. In a DC motor, the stator's magnetic field is fixed, while the rotor’s field is perpendicular to it, maintaining a consistent spatial position. In an asynchronous motor, the stator generates a rotating magnetic field, inducing current in the rotor and creating an induced magnetic field that follows the stator field at approximately a 90-degree angle. In a synchronous motor, the rotor is excited by DC to form a fixed magnetic field that rotates in sync with the stator, resulting in a 0-degree angle. Stepper motors, whether reactive or hybrid, operate similarly to synchronous motors without external excitation. After the stator is energized, the rotor aligns with the stator field, maintaining a 0-degree angle. However, if the synchronization angle difference exceeds half the step angle, "out of step" occurs.
The stator excitation method for stepper motors varies based on the number of phases, leading to different driving circuits. Most conventional systems use pulsating rotating magnetic fields in the stator, which can cause issues like low-speed oscillation, resonance, and reduced precision. To address these limitations, a new concept called "synchronous vector operation mode" was introduced, leading to the development of the SV series stepping motor system.
This system generates a uniform rotating magnetic field in the stator, allowing smooth and synchronized operation. For a three-phase stepping motor, the mathematical model ensures that the synthetic magnetic field vector remains constant. The phase currents are represented by bimodal functions with a 120-degree phase difference. When operating in different modes, such as single-phase or double-phase, the phase current values correspond to specific points on the waveform. This approach improves control accuracy and reduces vibration and noise.
The SV series system includes a function generator, power driver, power supply, and protection circuit. The function generator uses a counter and ROM to generate discrete phase current signals, which are then converted to analog using a D/A converter. The power driver utilizes PWM technology to drive the motor windings efficiently. A variable voltage supply enhances performance for high-speed applications, while the protection circuit ensures system safety.
In practical applications, the system improves resolution and control accuracy. For example, with N=90, the number of equal-strength vector points reaches 7200, enabling precise positioning. Open-loop control achieves high accuracy, and closed-loop systems further enhance performance. The system also allows for smooth speed control, similar to DC servo systems, making it suitable for high-precision industrial applications.
By optimizing the magnetic field distribution and improving the motor design, manufacturers can enhance torque and efficiency. The future of stepping motor technology lies in integrating advanced control algorithms and better material science to achieve even higher performance and reliability. Dark gray Transmitting Antenna,B01 Dark gray Receiving Antenna,B01 Dark gray Directional Antenna Mianyang Ouxun Information Industry Co., Ltd , https://www.ouxunantenna.com