Absolute Encoder
Absolute encoders are used for detecting the position and provide information on the absolute position of a motion platform. For example, this can be realized optically by using an additional Pseudo Random Code (PRC) scale.
DC Motor with ActiveDrive (PWM)
To achieve higher velocities, PI developed ActiveDrive technology for controlling motors with a rated power exceeding the controller's output power. To this end, an amplifier is integrated with the motor in a shielded case. The controller triggers the integrated amplifier via a pulse width modulation (PWM). As illustrated in figure 7, the motor power is regulated via the ratio of on/off time. This requires a separate power adapter for supplying the amplifier and optimized heat dissipation for maintaining precision.
Air Bearing
An air film of a few micrometers is used as bearing. Therefore, air bearings are free of friction and, compared to mechanical bearings, allow a considerably higher guiding accuracy.
Amplifier Classification
PI uses the following amplifier classifications: Charge controlled, switched (class D), linear (class AB).
Amplifier Resolution
Only for digitally controlled amplifiers: Measurement of the smallest digital output value (LSB) in mV.
Area Scan
Motion sequence for a predefined area.
See >> Scan Routine.