Servo Drive Amplifier

Product Specifications

Technical details and manufacturing context for Servo Drive Amplifier

Definition

A servo drive amplifier is a critical electronic component within a servo drive system that receives low-power control signals from the controller and amplifies them into high-power electrical currents to precisely drive and control the motion of a servo motor. It regulates torque, speed, and position by modulating voltage and current to the motor windings. The amplifier is designed for use in machinery and equipment manufacturing, where precise motion control is essential. It is a component-level product, typically integrated into a larger servo drive system. The amplifier's rated power ranges from 0.4 to 15 kW, matching the motor size. It operates on a three-phase supply voltage of 200–480 V AC. Continuous output current is 2–100 A RMS per phase, with peak output current of 4–200 A for a 3-second overload. Control accuracy is ±0.01% for speed regulation, and frequency response is 1–3 kHz closed-loop bandwidth. Operating temperature is -10 to 50°C, with derating above 40°C; storage temperature is -40 to 85°C. Protection class is IP20 to IP54 (IP54 with option) per IEC 60529. Cooling is forced air flow of 0.5–2.5 m³/min. Weight ranges from 2 to 25 kg, and dimensions vary by model: 100–300 mm width, 200–500 mm height, 150–400 mm depth. Materials include silicon for semiconductors, copper for windings and traces, aluminum for heat sinks, epoxy resin for PCB substrate, and plastic for housing. These values are directory reference ranges and must be confirmed for the specific model and application. Verify all specifications and standards with the legal manufacturer or supplier before procurement.

Working Principle

The amplifier receives command signals (typically pulse, analog voltage, or digital communication) specifying the desired motor position, speed, or torque. It compares this command with feedback signals (from encoders or resolvers on the motor) to calculate an error. Using this error, its internal control loops (current, velocity, position) generate Pulse Width Modulation (PWM) signals. These PWM signals drive power transistors (like IGBTs or MOSFETs) in an H-bridge configuration to switch high DC bus voltage, creating a controlled AC waveform (voltage and frequency) that is supplied to the servo motor, causing precise rotational movement.

Common Materials

Silicon (for semiconductors), Copper (for windings/traces), Aluminum (for heat sinks), Epoxy resin (for PCB substrate), Plastic (for housing)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	0.4–15 kW	Matches motor size
Supply Voltage	200–480 V AC	3-phase input
Continuous Output Current	2–100 A	RMS per phase
Peak Output Current	4–200 A	For 3 s overload
Control Accuracy	±0.01 %	Speed regulation
Frequency Response	1–3 kHz	Closed-loop bandwidth
Operating Temperature	-10–50 °C	Derate above 40°C
Storage Temperature	-40–85 °C	Non-condensing
Protection Class	IP20–IP54	IP54 with optionIEC 60529
Cooling Method	0.5–2.5 m³/min	Forced air flow
Weight	2–25 kg	Depends on power
Dimensions (W×H×D)	100–300×200–500×150–400 mm	Varies by model

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Power Stage (H-Bridge)
Contains power transistors (IGBTs/MOSFETs) that switch the DC bus voltage to generate the AC output for the motor.

Material: Silicon semiconductors, copper
Control Board (PCB)
Processes command and feedback signals, runs control algorithms, and generates PWM signals for the power stage.

Material: Epoxy resin (substrate), copper traces, electronic components
Heat Sink Part
Dissipates heat generated by the power transistors to prevent overheating and ensure reliability.

Material: Aluminum
DC Bus Capacitors Part
Store and smooth the rectified DC voltage from the power supply, providing stable energy for the power stage.

Material: Aluminum electrolytic materials
Communication Ports Part
Physical connectors for control signals, feedback signals, and network communication.

Material: Plastic, metal contacts

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Servo Drive System

View system integration details

Manufacturers of Servo Drive Amplifier

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Frequently Asked Questions

What is the typical input signal for a servo drive amplifier?

Typical input signals include pulse trains, analog voltage (e.g., ±10 V), or digital communication protocols (e.g., fieldbus). These signals specify the desired position, speed, or torque.

How does the amplifier achieve precise control?

It uses closed-loop control with feedback from encoders or resolvers. The internal control loops (current, velocity, position) compare the command with feedback and adjust PWM signals to minimize error.

What are the key electrical specifications to consider?

Key specifications include rated power (0.4–15 kW), supply voltage (200–480 V AC), continuous output current (2–100 A RMS), and peak output current (4–200 A for 3 s overload). These must match the motor and application.

What environmental conditions can the amplifier operate in?

Operating temperature is -10 to 50°C (derate above 40°C), storage temperature is -40 to 85°C. Protection class ranges from IP20 to IP54 (with option). Cooling requires forced air flow of 0.5–2.5 m³/min.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Humidity: 5-95% non-condensing, Vibration: 5-2000 Hz at 2G max
temperature:	-10°C to +40°C (operating), -20°C to +70°C (storage)

Product Specifications

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