Table of Contents
1. Core Components
2. High-Frequency Interference Suppression Solutions
3. Selecting a Suitable EMC Power Filter for Servo Systems
Keywords
Servo System, Servomechanism, PMSM, EMC Power Filter, ROHS Certification
A servo system, also referred to as a servomechanism, achieves high-precision motion control by accurately regulating motor position, speed, and torque. It is widely employed in applications such as CNC machine tools and industrial robotics.
1.Core Components
- Servo Drive: Receives control signals and modulates the current and voltage supplied to the motor.
- Servo Motor: Typically a permanent magnet synchronous motor (PMSM), delivering high dynamic response and precise motion.
- Feedback System: Utilizes encoders or resolvers to provide real-time data on motor status, enabling closed-loop control.
2.High-Frequency Interference Suppression Solutions
The primary source of interference stems from the high-frequency switching operation (10 kHz–100 kHz) of servo drives, which generates transient current and voltage spikes. These give rise to common-mode and differential-mode noise, propagating through power lines or ground loops, potentially disrupting control signals or causing communication errors.
High-frequency interference is effectively suppressed by EMC power filters. These filters employ a low-pass configuration to attenuate high-frequency noise while allowing the transmission of utility frequency (50/60 Hz) power. Key functions include:
- Common-Mode Suppression: Mitigates noise between power lines and ground, preventing interference propagation through grounding paths.
- Differential-Mode Suppression: Filters noise between live conductors, safeguarding both the equipment and the power grid.
3.Selecting a Suitable EMC Power Filter for Servo Systems
- Identify Interference Frequency Range: Servo system noise typically concentrates within 150 kHz–30 MHz. Select a filter with effective attenuation across this spectrum.
- Current Rating Matching: Choose a filter model compatible with the system’s power rating and operational current.
- Certification Verification: Prioritize products certified with CE and ROHS marks to ensure compliance with international safety and environmental standards.
- Environmental Considerations: For industrial settings, opt for filters designed to withstand elevated temperatures, mechanical vibration, and harsh operating conditions.
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