The main components of a servo motor driver include a control system and a drive system.
1. Control System
It is generally composed of a DSP, which is used to collect current feedback values to close the current loop, collect encoder signals to calculate the speed to close the speed loop, and generate PWM switching signals for the six switching transistors of the drive system.
2. Drive System
a . Rectifier and filter circuit, for example, converting 220V AC to approximately 310V DC to supply the IPM.
b . The Intelligent Power Module (IPM) internally uses a three-phase two-level bridge circuit. The upper and lower switches of each phase output U, V, and W respectively. By switching on and off the six switches, the IPM controls whether each of the three phases (UVW) is connected to ground or to a high-voltage DC circuit at any given moment.
c . Current sampling circuit, possibly a Hall current sensor, whose output will be connected to the AD port of the control system.
d . The encoder's peripheral circuitry, whose output is connected to the DSP's event manager.
The most crucial part is actually the software. The above describes the hardware components.
