Baumuller BUM61-20 Servo Driver

Control Command Reception: The drive receives control signals from upper-level controllers (such as PLC, CNC systems), commonly in the form of analog signals (e.g., ±10V voltage), digital pulses (e.g., PWM, pulse + direction signals), or communication protocols (e.g., EtherCAT, Modbus, CANopen, etc.). For example, when the upper-level controller sends a "speed command of 1000rpm", the drive parses the command through the communication interface.

Parameter Configuration and Logic Processing: The drive preprocesses input signals based on preset parameters (such as speed gain, position loop bandwidth, current limit, etc.) and internal control algorithms. For instance, it adjusts the dynamic response characteristics of commands through a proportional-integral-derivative (PID) controller.

Power Conversion: The drive is connected to three-phase AC power (typically 380V AC), converting AC to DC through a rectifier circuit (such as an IGBT rectifier bridge), which is stored in DC bus capacitors. When driving the motor, DC power is converted into three-phase AC with adjustable frequency and amplitude through an inverter circuit (IGBT power modules) and output to the servo motor.

Vector Control (Field-Oriented Control, FOC): This is one of the core control technologies of the BUM61-20. By decomposing three-phase current into "field current (Id)" and "torque current (Iq)", it controls the motor's magnetic field strength and output torque respectively, achieving control precision similar to that of DC motors. For example, in high-speed cutting scenarios, the drive adjusts Iq in real time to ensure stable motor torque and avoid speed fluctuations due to load changes.

Sensor Signal Acquisition: The drive real-time acquires the motor's actual position, speed, and rotor angle information by connecting to built-in feedback elements (such as absolute encoders, resolvers). For example, an encoder outputs thousands of pulses per revolution, and the drive determines the motor position by counting the pulses.

Error Calculation and Correction: Compares the actual feedback value with the input command, calculates deviations (such as position deviation, speed deviation), and adjusts output voltage and current through closed-loop control algorithms (such as PID, feedforward control) to eliminate deviations. For instance, when the motor's actual speed is lower than the command speed, the drive increases output current to enhance motor torque, enabling the speed to quickly track the command.

Real-Time Status Monitoring: The drive is equipped with multiple built-in sensors to monitor parameters such as DC bus voltage, power device temperature, and motor current. For example, when motor overload is detected, current limiting is immediately triggered to prevent damage to the motor or drive.

Fault Response Mechanism: If anomalies (such as overvoltage, overcurrent, overheating) are detected, the drive immediately cuts off power output, notifies the upper-level controller through alarm signals (such as LED indicators, communication messages), and records fault codes for troubleshooting.