Velocity and voltage feedback to control a motor

摘要

Control circuitry 40 for controlling a motor 42 is responsive to feedback signals 52,62 derived from a motor velocity sensor 72 and a voltage associated with the motor 42, such as the back emf of a coil 42A. A filter 68 may be incorporated to limit the operation of the voltage feedback to a range of frequencies. The control circuitry 40 can be used to enhance the Z-axis control of a tool 24 of a work apparatus 10 for performing work operations on a work material 12, such as a cutting apparatus for cutting a sheet of vinyl 12 having a releasable backing for generating graphic products 33.