Rockwell Automation Liqui-Flo DBT Reach Drive - Manual (Page 215)

Application Notes Appendix D-1
A
PPENDIX
D
Application Notes
External Brake Resistor
Motor Control Technology
There are several motor control technologies:
• Torque Producers
• Torque Controllers
• Speed Regulators
Torque Producers
Volts/Hertz
This technology follows a specific pattern of voltage and frequency output to the
motor, regardless of the motor being used. The shape of the V/Hz curve can be
controlled a limited amount, but once the shape is determined, the drive output is fixed
to those values. Given the fixed values, each motor will react based on its own
speed/torque characteristics.
Figure D.1 – External Brake Resistor
BR1
BR2