LINEAR SERVO AMPLIFIERS & CONTROLLERS

New! LALD Series Low Drift Linear Servo Amplifiers

We offer some of the best performing Linear Servo Amplifiers on the market today. Our LA Series Linear Servo Amplifiers are ideal for applications requiring low noise, high bandwidth and zero crossover distortion.

Linear Servo Amplifier
LA-415 Linear Servo Amplifier

Our linear servo amplifier design features a high-speed DSP that provides real-time fault monitoring and detection. Sophisticated algorithms are used to continually protect the amplifier from potentially damaging conditions, including overpower.

All of our amplifiers feature Safe Operating Area (SOA) protection, which monitors the power of each output transistor and protects the amplifier from damage in the event of an overpower condition. Linear servo amplifiers that do not have this feature can easily be damaged, or destroyed, if the power in the application exceeds the capability of the linear servo amplifier.

Our linear servo amplifiers have proven to be extremely reliable in the field due to our robust design, extensive fault protection circuits and quality control procedures. Each unit must undergo comprehensive testing including an Automated Test Procedure that ensures all circuits are working correctly.

Our proprietary Autobalance feature allows fast and easy setup of the amplifier with any motor or load. With the push of a button, this feature automatically balances the amplifier and motor for optimum system performance. Valuable manufacturing time (and money) can be saved since the balancing routine is typically completed in a few seconds and the technician does not need any special tools or equipment.

All of our linear servo amplifiers are easily configured using either the on-board jumpers or with the built-in serial interface. The serial interface also allows monitoring of the drive parameters and status in real-time during operation. All settings are stored in non-volatile memory during power-off conditions. Our servo amplifiers can easily be configured during production by downloading the settings from a host computer.

Our new LALD series Low Drift Linear Servo Amplifiers offer up to 100x improvement in drift over our LA Series. These new amplifiers come in 500W and 800W power ranges, with up to 3000W peak. They are designed for ultra-high precision positioning stages that require minimal drift over temperature from the electronics.

Linear Servo Amplifier

LA-415-Stand Alone Linear Servo Amplifier

Linear Servo Amplifier

LALD Linear Servo Amplifiers

Varedan Linear Servo Amplifiers are available in the following modes:

Single-Phase Current Command Mode (Brush-type or Voice Coil Motor)

Accepts a single +/-10V analog input as current command reference. No feedback is required from the motor. The amplifier closes the current loop.

2-Phase Current Command Mode (3-Phase Brushless Motor)

Accepts two +/-10V analog inputs as current command references for two of the motor phases and derives the third phase internally. No feedback is required back to the amplifier, as the controller provides the commutation. The amplifier closes the current loops.

Trapezoidal Mode

Accepts a +/-10V analog input as a current (torque) command reference and commutates the motor using hall sensors, or commutation tracks from an encoder. The amplifier closes the current loops.

Torque Mode

Accepts a +/-10V analog input or serial command as a current (torque) command reference and commutates the motor using sinusoidal commutation from a motor mounted encoder. The amplifier closes the current loops.

Velocity Mode

Accepts a +/-10V analog input, TTL frequency pulse train, or serial command as a velocity (speed) command reference and commutates the motor using sinusoidal commutation from a motor mounted encoder. Profile ramping is done by the internal trajectory generator using either linear or S-curve ramping. The amplifier/controller closes the velocity and current loops using PID control.

Position Mode

Accepts position commands from the serial interface, and commutates the motor using sinusoidal commutation from a motor mounted encoder. Position commands can be either cyclical (resets every revolution) or linear. The DSP maintains a 32-bit internal position counter to allow up to +/-2147483648 positions. Rotary positions can be referenced to the encoder's index marker. Profile ramping is done by the internal trajectory generator using either linear or S-curve ramping. The amplifier/controller closes the position, velocity and current loops using PID control.

Note: Initial Motor Commutation

In all of the commutating modes, initial motor commutation can be established using either hall sensors or encoder commutation tracks (no motion on startup) or directly from the motor's quadrature encoder (requires movement on startup).

Key benefits of our Linear Servo Amplifier design

  • Safe Operating Area (SOA) protection from overpower conditions
  • High-bandwidth (up to 10kHz) for superior system response
  • Ultra quiet linear output stage eliminates radiated noise
  • Zero crossover distortion for precise positioning
  • DSP-based design for performance, reliability, and ease of setup
  • Extensive internal fault monitoring for reliable performance
  • Autobalance feature automatically balances the amplifier and load
  • All settings are digital, no potentiometers to adjust
  • User programmable settings using high speed serial interface
  • Non-volatile storage of all parameters for reliable startup
  • Easily configured for any motor/feedback combination
  • Many modes of operation to choose from

Performance

  • Multiple power ranges available
  • High efficiency heatsinks allow for small package size
  • Single-axis motion modules provides commutation and positioning

Packaging

  • Panel mount OEM modules
  • Single-axis line powered stand-alone box
  • Multi-axis line powered baseplate assemblies
  • Custom packaging is available. Please contact us.

Typical Applications for our Linear Servo Amplifiers

  • Linear Air Bearing Stages
  • Rotary Air Bearing Spindles
  • Spindle Control
  • Semiconductor Processing
  • Linear Servo Stages
  • Rotary Servo Stages
  • Diamond Turning Lathes
  • Lens Grinding Equipment
  • Laser Steering
  • Ultrasonic Scanning
  • Coordinate Measuring Machines (CMM)
  • Disk Inspection Spin Stands
  • Thermoelectric Cooling Control (TEC)
  • Fiber Optic Welding
  • High Resolution Positioning Systems

LA Series Linear Servo Amplifier & Controller Modules


Amplifier Power Output Current Dimensions Mode of Operation
Cont./Peak Cont./Peak L x W x H 2-Phase
Current Command
or Trapezoidal Mode
Single-Phase
Current
Command Mode
Current (Torque),
Velocity (Speed),
or Position Mode
  Brushless Brush Brushless Brush
200/400W 2.5/10A 8.00" x 7.50" x 1.50" LA-210 LA-210S LA-2110 LA-2110S
400/1200W 5/15A 8.00" x 7.50" x 2.25" LA-415 LA-415S LA-4115 LA-4115S
500/1500W 10/25A 8.00" x 7.50" x 2.75" LA-525 LA-525S LA-5125 LA-5125S
800/3000W 15/30A 8.00" x 7.50" x 4.75" LA-830 LA-830S LA-8130 LA-8130S
800/4500W 18/35A 8.00" x 7.50" x 4.75" LA-835 LA-835S LA-8135 LA-8135S
800/6000W 20/40A 8.00" x 7.50" x 4.75" LA-840 LA-840S LA-8140 LA-8140S
1500/3000W 20/35A 8.00" x 7.50" x 5.75" LA-1535 LA-1535S LA-15135 LA-15135S
1500/4500W 25/45A 8.00" x 7.50" x 5.75" LA-1545 LA-1545S LA-15145 LA-15145S
1500/6000W 30/55A 8.00" x 7.50" x 5.75" LA-1555 LA-1555S LA-15155 LA-15155S
500/1500W 2-10/10-25A 8.00" x 7.50" x 2.75" LALD-525 LALD-525S
800/3000W 5-15/10-30A 8.00" x 7.50" x 4.75" LALD-830 LALD-830S


Stand Alone Linear Servo Amplifiers & Controllers


Amplifier Power Output Current Dimensions Mode of Operation
Cont./Peak Cont./Peak L x W x H 2-Phase
Current Command
or Trapezoidal Mode
Single-Phase
Current
Command Mode
Current (Torque),
Velocity (Speed),
or Position Mode
  Brushless Brush Brushless Brush
400/1200W 5/15A 12.18" x 6.28" x 7.87" LA-415-SA LA-415S-SA LA-4115-SA LA-4115S-SA
800/1500W 10/30A 17.70" x 8.75" x 7.93" LA-830-SA LA-830S-SA LA-8130-SA LA-8130S-SA


LALD Low Drift Linear Servo Amplifiers


Amplifier Power Output Current Dimensions Mode of Operation
Cont./Peak Cont./Peak L x W x H 2-Phase
Current Command
or Trapezoidal Mode
Single-Phase
Current
Command Mode
  Brushless Brush
500/1900W 15/25A 9.00" x 7.50" x 2.612" LALD-525 LALD-525S
500/3800W 15/40A 9.00" x 7.50" x 2.612" LALD-540 LALD-540S
800/1900W 15/25A 9.00" x 7.50" x 3.871" LALD-825 LALD-825S
800/3800W 15/40A 9.00" x 7.50" x 3.871" LALD-840 LALD-840S
1500/1900W 15/25A 9.00" x 7.50" x 4.871" LALD-1525 LALD-1525S
1500/3800W 15/40A 9.00" x 7.50" x 4.871" LALD-1540 LALD-1540S