Sometimes we are easy to confuse the role of electromagnetic braking, regenerative braking and dynamic braking, and choose the wrong accessories. These concepts are clarified below. The dynamic brake is composed of a dynamic braking resistor, which shortens the mechanical feed distance of the servo motor through energy consumption braking in the event of a fault, emergency stop, or power failure. Regenerative braking means that when the servo motor decelerates or stops, the energy generated by the braking is fed back to the DC bus through the inverter circuit, and absorbed by the resistance-capacitance circuit. The electromagnetic brake is to lock the shaft of the motor through a mechanical device. The difference between the three (1) The regenerative braking must work when the servo is working normally, and the motor cannot be braked in the event of a fault, emergency stop, power failure, etc. The dynamic brake and electromagnetic brake do not need power supply when working. (2) The work of regenerative braking is carried out automatically by the system, while the work of dynamic braking and electromagnetic braking requires external relay control. (3) Electromagnetic brake is generally started after SV OFF, otherwise the amplifier may be overloaded. Dynamic brake is generally started after SV OFF or the main circuit is powered off, otherwise the dynamic braking resistor may be overheated. Notes on choosing accessories

Modern AC servo systems, after undergoing changes from analog to digital, have their internal digital control loops ubiquitous, such as commutation, current, speed and orientation control, etc.; Functional DSP plus FPGA, and even servo-specific modules are also rudimentary. In addition, new power devices or modules are updated every 2 to 2.5 years, new software algorithms are also changing with each passing day, and the servo products of international manufacturers are also updated about every 5 years. In short, the product life cycle is getting shorter and shorter. , changing faster and faster. Summarizing the technical road and product road of domestic and foreign servo manufacturers, and contacting the changes in market demand, we can see the latest development trends of the following servo motor systems: high efficiency Although high efficiency has always been the primary open issue for the servo system, it still needs to be strengthened. It mainly includes the high efficiency of the motor itself: such as the improvement of the performance of permanent magnet materials and the very good structure of the magnet equipment; it also includes the high efficiency of the drive system: including the optimization of the inverter drive circuit, the optimization of the acceleration and deceleration motion, the regeneration system Dynamic and energy response and very good cooling methods etc. Direct drive Direct drive includes turntable servo drive using disc motor and linear servo drive using linear motor. Since the transmission error of the base mechanical transmission equipment is e

Servo motor: 6 key parameters for servo drive selection A servo system is a feedback control system used to accurately follow or reproduce a process. The servo system is an automatic control system that enables the output controlled quantities such as the position, orientation, and state of the object to follow any changes in the input target (or given value). Its main task is to amplify, transform and regulate the power according to the requirements of the control command, so that the torque, speed and position control of the drive device is very flexible and convenient. The servo driver is a part of the servo system and is used to control the servo motor. Its function is similar to that of the inverter acting on the ordinary AC motor. It is mainly used in high-precision positioning systems. Generally, the servo motor is controlled by three methods of position, speed and torque to achieve high-precision positioning of the transmission system. It is currently a high-end product of transmission technology. Selecting a suitable servo driver needs to consider various aspects, which are mainly selected according to the requirements of the system. Before selecting the type, first analyze the following system requirements, such as size, power supply, power, control method, etc., to set the direction for the selection. . Let's take a look at various parameters of the servo drive. 1. Continuous current, peak current; 2. Power supply voltage, control part supply voltage;

How Servo Motors Work The "switch" of Fuji PLC is used to control the start and stop of the servo controller. The start or stop of the servo controller is to start and stop the servo motor. The control accuracy of the servo controller is higher than that of the inverter. Servo motors are generally used in occasions requiring high control accuracy (such as: speed control, position control, torque control). Fuji servo motor comes with photoelectric encoder. The rotation of the rotor drives the code disc of the photoelectric encoder. The number of turns of the rotor directly affects the number of pulses sent by the encoder to the controller. The pulses make the servo rotate, and the DO output determines the servo direction. The pulse direction controls the direction of the servo, the forward pulse servo rotates forward, and the reverse pulse servo reverses, so the Fuji servo motor combined with the servo controller can truly realize its precision control. If the servo is controlled by analog quantity, positive and negative analog quantity can be used for forward and reverse control. If using communication control, send the command directly. On the program, you can directly input the position JOG command to make it forward or reverse.