With the TMC457, TRINAMIC advances the State-of-the-art in high-end precision motion controllers.
10 februari 2009
The TMC457 accepts digital quadrature signals (ABN, ABZ) from incremental encoders over its integrated encoder interface. The measured position is processed directly by the on-board easyPID controller and is software-readable from a register. PID parameters and all other motion parameters are programmable and can be changed on-the-fly, even in the midst of acceleration or braking. This unique characteristic simplifies the develop-ment of control software dramatically.
Unlike conventional stepper motors, piezo motors do not have a fixed step size. Thus, the TMC457 supports different integration parameters for the step sizes of motor and encoder. Using this capability along with encoder feedback, direct positioning in the nanometer range is possible.
Users need only to provide the software for movement control parameters and the chosen communication bus protocol. The fast PID controller works at a 16 MHz clock frequency with a cycle rate of 100 kHz. A high cycle rate is necessary with fast movements or highly resolvable movements and any combination of the two.
The TMC457 can be connected directly to any of TRINAMIC's stepper motor drivers, such as the TMC236, TMC239, TMC246, or TMC249. The device includes TRINAMIC's chopSync function, which allows high speed operation without resonance problems. In addition there is an S/D output for drivers.
Because of the high resolution of the micro step size (lookup table RAM for up to 2048 steps per full step) the TMC457 is particularly suitable for applications requiring extreme precision, such as semiconductor processing equipment, biotech laboratory automation or optics.