The phase angle meter measures phase angles between line-to-line
voltages and between tachometer signals used for feedback. The
primary use is for alignment of a tachometer to the EC motor phase
voltages. The tachometer signals can be from magnetic encoders,
resolvers and synchros. The meter output is monitored on a PC over
an RS232 network. Phase angle precision in production is dependent
upon component position accuracy.
A typical alignment configuration is shown in the photo. The 3-Phase
EC motor on the right is driven by the motor on the left. The tachometer
is tuned until the proper phase angle between the encoder signals
and the winding voltages is achieved.