SERVOSTAR-343 Kollmorgen
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The SERVOSTAR-343 is a servo drive made by Kollmorgen as part of the S300 Servo Drives series. It features a rated input power of 2.5 kVA and a peak output current of 7.5 Arms. The drive has an internal brake resistor of 91 Ohms and a maximum DC bus voltage of 900 VDC.
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Product Description:
The SERVOSTAR-343 is a digital servo amplifier developed by Kollmorgen for the S300 Servo Drives series. It converts a three-phase supply into a controlled DC bus and pulse-width-modulated output that regulates synchronous or induction motors in automated packaging, material-handling, and positioning equipment. By combining current, voltage, and thermal monitoring with integrated braking circuitry, the unit provides the torque commands and speed control required by a motion controller while fitting into compact machine cabinets.
The DC-link circuitry is rated for up to 900 VDC, while an overvoltage trip disconnects the drive if the bus reaches 800 VDC when operating from a 400 V supply. The brake switch engages at 720 VDC to protect the semiconductors. The IGBT output bridge switches at 8 kHz, and the control system increases the carrier frequency to 16 kHz when load current falls to half of the rated value to reduce audible noise. Continuous torque delivery is supported by a rated phase current of 4 A RMS, while momentary acceleration can draw up to 7.5 A RMS. A line demand of 2.5 kVA helps determine the required cabinet feeder capacity. The DC-link conductor pair has a residual voltage drop of only 5 V, supporting responsive power delivery during dynamic operation. Voltage edges rise at 5.7 kV/µs, so the motor cable insulation must be suitable for this rate of voltage change.
The internal regeneration network absorbs mechanical energy with 50 W of continuous braking power through a 91 Ω resistor, allowing most indexing cycles to operate without an external braking resistor. Motor compatibility requires a minimum inductance of 8.9 mH at 400 V, while motors with lower inductance require series reactors. Heat loss is 12 W when the output stage is disabled and increases to 60 W at rated load, so the cabinet must provide adequate ventilation around the amplifier. Airborne sound remains below 45 dB(A) at a distance of one meter, limiting audible noise near the installed drive.
720 VDC
50 W
91 Ω
900 VDC
45 dB(A)
8.9 mH
Frequently Asked Questions about SERVOSTAR-343:
Q: What is the rated output current of the SERVOSTAR-343 at 400 V?
A: The SERVOSTAR-343 has a rated output current of 4 Arms at 400 V, supporting medium power servo applications.
Q: What is the value of the internal brake resistor in the SERVOSTAR-343?
A: This drive features an internal brake resistor rated at 91 Ω, suitable for managing braking energy during deceleration.
Q: What is the peak output current the SERVOSTAR-343 can supply?
A: The SERVOSTAR-343 drive has a peak output current capability of 7.5 Arms.
Q: What is the rated input power for the SERVOSTAR-343 drive?
A: With a rated input power of 2.5 kVA, the SERVOSTAR-343 is designed to operate effectively in demanding automation tasks.
Q: What is the maximum noise emission level for the SERVOSTAR-343?
A: Noise emission from the SERVOSTAR-343 reaches a maximum of 45 dB(A), enabling operation in noise-sensitive environments.
Instructions
How to Determine What Torque You Need for Your Servo Motors
When building a robotic system with servo motors, determining the appropriate torque for each motor is essential. Torque is what allows the servo motor to effectively lift, hold, or move an object. Without sufficient torque, your motor either won’t perform as expected or may damage itself trying.
Here, we’ll break down how to calculate the torque you need, then pivot into some key nuances around how torque works in different contexts.
What Is Torque?
Torque is a force applied over a distance that causes rotation. You use torque every day when you twist open a jar or turn a doorknob. In the case of servo motors—specifically in robotics—torque determines how much weight a motor can rotate at a certain distance away from its axis. Think about a robotic arm lifting a heavy object: the motor's torque directly affects how much weight the arm can lift, and at what speed.
Mathematically, torque is expressed as:
τ = r × F
- τ is torque,
- r is the distance from the axis of rotation,
- F is the force applied.
If that feels abstract, consider that F is usually the force caused by gravity, meaning it depends on the weight of the object and its distance from the motor's center.
Torque and Servo Motors: The Core Relationship
Servo motors are frequently used in robotic arms or other machines with rotational mechanisms. The amount of torque a servo motor can exert determines its capability to perform mechanical tasks, especially when dealing with varying loads.
The lever arm length—the distance from the rotation point to the load—amplifies the effect of the weight being moved. A longer lever arm requires more torque even if the weight remains the same. So, as we dive into calculations, remember that torque isn't just about force; it’s also about how far away from the motor's axis that force is applied.
Formula Recap
The standard torque equation for servo motors typically used in applications like robotic arms can be expanded slightly:
τ = r × m × g
- r is the distance from the motor's axis to where the load is applied,
- m is the mass of the item being moved (in kilograms),
- g is the acceleration of gravity (~9.81 m/s²).
Let’s translate this into something more immediately practical: a robotic arm needs torque to lift an object at the end of the arm. If the arm is long, you’ll need more torque to achieve that same lift, even if the object you’re lifting doesn’t change in weight.
Components of Torque in Servo Motors
1. Weight of Components
The force caused by the weight of objects being moved is simple physics. Every load you expect the motor to handle has a weight. Multiplied by gravity, that’s your F.
A robotic arm lifting a box must overcome the weight of the box. However, the motor also needs to account for the weight of the components themselves, like robotic arm links or grippers.
2. Distance from the Pivot
The lever arm length is just as crucial. Calculating torque by only considering force and weight without factoring in the arm’s length will result in inaccurate torque requirements and potentially a poor design.
Case Study: A Simple Robotic Arm
Imagine an arm that needs to lift a 1.5 kg box at the end of a 0.5-meter-long arm.
- m = 1.5 kg
- r = 0.5 m
- g = 9.81 m/s² (constant)
We’re now ready to plug in values:
τ = r × m × g
τ = 0.5 m × 1.5 kg × 9.81 m/s²
τ = 7.36 Nm
This means you require a minimum torque of 7.36 Newton-meters (Nm) to lift the box at the end of this particular robotic arm.
Angular Acceleration
In any instance where you need the servo motor to move a load and not just hold it, you must also account for angular acceleration. Angular acceleration means your motor needs extra torque at the beginning and during changes in movement. To calculate it:
τ = I × α
- I is the moment of inertia of the robot arm (resistance to angular motion),
- α is angular acceleration.
This means that for movements such as high-speed rotations or rapid direction changes, torque requirements jump. The speed with which the load moves and how quickly the direction changes are factored into torque calculations for dynamic motion.
Final Thoughts
To summarize everything, calculating torque isn’t just as simple as deciding how heavy a load is. It requires you to think about:
- Distance (where the weight is applied from the axis),
- Weight of the object being moved,
- The weight of other mechanical components (like links and joints inside the machine),
- Angular acceleration, especially if the motor will be moving or changing directions rapidly,
- Safety margins (plan a buffer of 20-30% torque capability beyond the minimum).
The general idea is that the larger the load or the further away from the pivot, the more torque you need. By thinking through all of these details, you can properly size your servo motor torque needs, ensuring your motor will handle everything smoothly without underperformance during operation.
Get expert servo motor guidance and competitive pricing from Wake Industrial. Whether you need one motor or a complete system, we'll help you find the right solution at the right price. Call 1-919-443-0207 now for a quick quote or email sales@wakeindustrial.com to browse our extensive servo motor inventory.
Instructions
How to Determine What Torque You Need for Your Servo Motors
When building a robotic system with servo motors, determining the appropriate torque for each motor is essential. Torque is what allows the servo motor to effectively lift, hold, or move an object. Without sufficient torque, your motor either won’t perform as expected or may damage itself trying.
Here, we’ll break down how to calculate the torque you need, then pivot into some key nuances around how torque works in different contexts.
What Is Torque?
Torque is a force applied over a distance that causes rotation. You use torque every day when you twist open a jar or turn a doorknob. In the case of servo motors—specifically in robotics—torque determines how much weight a motor can rotate at a certain distance away from its axis. Think about a robotic arm lifting a heavy object: the motor's torque directly affects how much weight the arm can lift, and at what speed.
Mathematically, torque is expressed as:
τ = r × F
- τ is torque,
- r is the distance from the axis of rotation,
- F is the force applied.
If that feels abstract, consider that F is usually the force caused by gravity, meaning it depends on the weight of the object and its distance from the motor's center.
Torque and Servo Motors: The Core Relationship
Servo motors are frequently used in robotic arms or other machines with rotational mechanisms. The amount of torque a servo motor can exert determines its capability to perform mechanical tasks, especially when dealing with varying loads.
The lever arm length—the distance from the rotation point to the load—amplifies the effect of the weight being moved. A longer lever arm requires more torque even if the weight remains the same. So, as we dive into calculations, remember that torque isn't just about force; it’s also about how far away from the motor's axis that force is applied.
Formula Recap
The standard torque equation for servo motors typically used in applications like robotic arms can be expanded slightly:
τ = r × m × g
- r is the distance from the motor's axis to where the load is applied,
- m is the mass of the item being moved (in kilograms),
- g is the acceleration of gravity (~9.81 m/s²).
Let’s translate this into something more immediately practical: a robotic arm needs torque to lift an object at the end of the arm. If the arm is long, you’ll need more torque to achieve that same lift, even if the object you’re lifting doesn’t change in weight.
Components of Torque in Servo Motors
1. Weight of Components
The force caused by the weight of objects being moved is simple physics. Every load you expect the motor to handle has a weight. Multiplied by gravity, that’s your F.
A robotic arm lifting a box must overcome the weight of the box. However, the motor also needs to account for the weight of the components themselves, like robotic arm links or grippers.
2. Distance from the Pivot
The lever arm length is just as crucial. Calculating torque by only considering force and weight without factoring in the arm’s length will result in inaccurate torque requirements and potentially a poor design.
Case Study: A Simple Robotic Arm
Imagine an arm that needs to lift a 1.5 kg box at the end of a 0.5-meter-long arm.
- m = 1.5 kg
- r = 0.5 m
- g = 9.81 m/s² (constant)
We’re now ready to plug in values:
τ = r × m × g
τ = 0.5 m × 1.5 kg × 9.81 m/s²
τ = 7.36 Nm
This means you require a minimum torque of 7.36 Newton-meters (Nm) to lift the box at the end of this particular robotic arm.
Angular Acceleration
In any instance where you need the servo motor to move a load and not just hold it, you must also account for angular acceleration. Angular acceleration means your motor needs extra torque at the beginning and during changes in movement. To calculate it:
τ = I × α
- I is the moment of inertia of the robot arm (resistance to angular motion),
- α is angular acceleration.
This means that for movements such as high-speed rotations or rapid direction changes, torque requirements jump. The speed with which the load moves and how quickly the direction changes are factored into torque calculations for dynamic motion.
Final Thoughts
To summarize everything, calculating torque isn’t just as simple as deciding how heavy a load is. It requires you to think about:
- Distance (where the weight is applied from the axis),
- Weight of the object being moved,
- The weight of other mechanical components (like links and joints inside the machine),
- Angular acceleration, especially if the motor will be moving or changing directions rapidly,
- Safety margins (plan a buffer of 20-30% torque capability beyond the minimum).
The general idea is that the larger the load or the further away from the pivot, the more torque you need. By thinking through all of these details, you can properly size your servo motor torque needs, ensuring your motor will handle everything smoothly without underperformance during operation.
Get expert servo motor guidance and competitive pricing from Wake Industrial. Whether you need one motor or a complete system, we'll help you find the right solution at the right price. Call 1-919-443-0207 now for a quick quote or email sales@wakeindustrial.com to browse our extensive servo motor inventory.
