Digital Servo Amplifier

DSA

The Digital Servo Amplifier (DSA) is a new generation of the servo driver for brushless motors with sinusoidal as well as trapezoidal commutation. The DSA is able to close not only motor current loop, but also velocity and position loops providing overall control of a servo axis. Sinusoidal commutation is reducing EMI/RFI emission and overcoming torque ripple. Popular position and velocity sensors are supported, like three-phase tacho generator, linear or discreet Hall effect sensors, incremental encoder (A-quad-B), Sin/Cos, SSI, and BiSS.

The servo driver is based on a sophisticated motion control DSP from TI. Several digital serial interfaces are supported: UART, SPI and CAN bus.

Specification Highlights

• Current mode four quadrant operation.
• Efficient Power Conversion.
• High Frequency (20KHz) PWM.
• Shunt regulator option.
• Position, Velocity or Torque operation modes.
• Axis master/slave modes for dual drive applications (torque bias) option.
• Pedestal master/slave modes for entire pedestal control via single communication link.
• Comprehensive BIT.
• Remote modification of driver parameters.

Input/Output

• Incremental Encoder Interface (A-quad-B).
• Configurable General Purpose I/O.
• UART
• CAN bus
• JTAG interface for maintenance purposes.

Protective Features

• Peak / Continuous current limit
• Short between phase
• Short between phase and ground
• Shot through current
• Under / Over voltage protection
• Over temperature
• Electrical limits and interlock
• Rate limits, software limits

Build-In-Test (BIT) Features

• Safe Switch
• Bus Current
• Bus Voltage
• Brake Current
• Phase Current Sum
• Internal Temperature
• Internal Humidity (optional)
• Motor Temperature (optional)
• Power Bridge Temperature
• Motor Encoder Health
• Load Encoder Health
• Axis Position Comparison by Motor and Load Encoders
• Axis Velocity Response
• Electrical Limits