NELSON controller, German NELSON model, NELSON price

NELSON controller is a type of controller used to control servo motors. Its function is similar to that of a variable frequency drive acting on a standard AC motor. It is part of the servo system and is mainly applied in high-precision positioning systems. Generally, it controls the servo motor through position, speed, and torque modes to achieve high-precision positioning of the transmission system, making it a high-end product in transmission technology. Servo drives are an important component of modern motion control and are widely used in automated equipment such as industrial robots and CNC machining centers. In particular, servo drives applied to control AC permanent magnet synchronous motors have become a research hotspot both domestically and internationally. Current AC servo drive designs commonly adopt a 3-loop control algorithm for current, speed, and position based on vector control. In this algorithm, the rationality of the speed loop design plays a key role in the performance of the entire servo control system, especially in speed control.

NELSON Controller Introduction

In the speed closed loop of a servo drive, the real-time measurement accuracy of the motor rotor speed is crucial for improving the static and dynamic characteristics of speed control in the speed loop. To balance measurement accuracy and system cost, incremental optical encoders are generally used as speed sensors, with the corresponding common speed measurement method being the M/T method. Although the M/T method offers certain measurement accuracy and a wide measurement range, it has inherent defects, including: 1) At least one complete code disk pulse must be detected within the speed measurement cycle, which limits the minimum measurable speed; 2) The 2 control system timer switches used for speed measurement are difficult to keep strictly synchronized, making it impossible to guarantee speed measurement accuracy in scenarios with significant speed changes. Therefore, traditional speed loop design schemes using this speed measurement method struggle to improve the speed following and control performance of servo drives.

NELSON Controller Principle

Currently, mainstream servo drives use digital signal processors (DSP) as the control core, enabling complex control algorithms and achieving digitization, networking, and intelligence. Power devices commonly use drive circuits designed around intelligent power modules (IPM). The IPM integrates the drive circuit and includes fault detection and protection circuits for overvoltage, overcurrent, overheating, and undervoltage. A soft-start circuit is also added to the main circuit to reduce impact on the drive during startup. The power drive unit first rectifies the input three-phase power or mains electricity using a three-phase full-bridge rectifier circuit to obtain the corresponding DC power. The rectified three-phase power or mains electricity is then converted by a three-phase sinusoidal PWM voltage-source inverter to drive the three-phase permanent magnet synchronous AC servo motor. The entire process of the power drive unit can be simply described as AC-DC-AC. The main topology of the rectifier unit (AC-DC) is a three-phase uncontrolled full-bridge rectifier circuit. With the large-scale application of servo systems, the use, debugging, and maintenance of servo drives have become important technical topics. More industrial control technical service providers are conducting in-depth research on servo drives. Servo drives are an important component of modern motion control and are widely used in automated equipment such as industrial robots and CNC machining centers. In particular, servo drives applied to control AC permanent magnet synchronous motors have become a research hotspot both domestically and internationally. Current AC servo drive designs commonly adopt a 3-loop control algorithm for current, speed, and position based on vector control. In this algorithm, the rationality of the speed loop design plays a key role in the performance of the entire servo control system, especially in speed control.

NELSON Controller Features and Applications

Servo drives are widely used in injection molding machines, textile machinery, packaging machinery, CNC machine tools, and other fields. Servo controllers can easily switch between operation modules and fieldbus modules via automation interfaces, while using different fieldbus modules to achieve different control modes (RS232, RS485, fiber optic, InterBus, ProfiBus), whereas general-purpose variable frequency drives have relatively single control methods. Servo controllers connect directly to resolvers or encoders to form closed loops for speed and displacement control. In contrast, general-purpose variable frequency drives can only form open-loop control systems. The various control indicators of servo controllers (such as steady-state accuracy and dynamic performance) are superior to those of general-purpose variable frequency drives.

Weidou Intelligent Technology professionally sells German NELSON servo drives, NELSON servo amplifiers, NELSON programmable logic controllers, NELSON control units, NELSON industrial PCs, NELSON logic controllers, NELSON drum controllers, NELSON relay controllers, NELSON control systems, NELSON motion controllers, NELSON microcontrollers, NELSON control modules, NELSON control switches, NELSON servo controllers, and NELSON expansion modules. NELSON products are original imports from Germany. Customers are welcome to inquire and order.