GFM controller, German GFM model, GFM price

The GFM 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. Servo motors are generally controlled via 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. 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 current, speed, and position 3-loop control algorithms based on vector control. In this algorithm, the rationality of the speed loop design plays a key role in the entire servo control system, particularly in the performance of speed control.

GFM Controller Introduction

In the servo drive speed loop, the real-time measurement accuracy of the motor rotor speed is crucial for improving the static and dynamic characteristics of speed control. 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 period, limiting the minimum measurable speed; 2) The 2 control system timer switches used for speed measurement cannot strictly maintain synchronization, failing to guarantee speed measurement accuracy in scenarios with significant speed changes. Therefore, traditional speed loop design schemes using this method struggle to improve the speed following and control performance of servo drives.

GFM 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 driver circuits designed around intelligent power modules (IPM). The IPM integrates driver circuits 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 full-bridge uncontrolled 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 automation service providers are conducting in-depth technical 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. 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 current, speed, and position 3-loop control algorithms based on vector control. In this algorithm, the rationality of the speed loop design plays a key role in the entire servo control system, particularly in the performance of speed control.

GFM 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 automated interfaces. Different control modes are achieved using different fieldbus modules (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-loop speed and displacement control. General-purpose variable frequency drives can only form open-loop control systems. The 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 GFM servo drives, GFM servo amplifiers, GFM programmable logic controllers, GFM control units, GFM industrial PCs, GFM logic controllers, GFM drum controllers, GFM relay controllers, GFM control systems, GFM motion controllers, GFM microcontrollers, GFM control modules, GFM control switches, GFM servo controllers, and GFM expansion modules. GFM products are original imports from Germany. Customers are welcome to inquire and order.