Danfoss Turbocor TT Series, Service Manual, Page: 194 / 294

4.23 Motor Components
4.23.1 Function
The motor type employed is a permanent magnet, synchronous speed motor. The winding section of the motor is
similar in design to a standard 3-phase star-connected Stator.
4.23.1.1 Stator
The Stator operates as the force that drives the shaft, utilizing the HV DC pulses provided to the motor windings by
the Inverter.
4.23.1.2 Rotor
The rotor is an integral part of the motor shaft and is a permanent magnet design that allows the synchronous
characteristic required for broad range speed control.
4.23.2 Motor Protection
Conventional motor protection based on incoming 3-phase currents and voltage conditions are inadequate to
protect the motor and electronics in the event of mishap due to the total separation of the motor windings from the
incoming 3-phase current by the DC conversion. Therefore, the bulk of protection is based on measurements taken
by the Inverter and calculations derived from those measurements.
Motor currents and voltages displayed in the SMT cannot be directly compared or correlated to incoming 3-phase
AC values.
All Stators employ overheat cutout protection utilizing thermistors in each winding.
4.23.3 Motor Connections
Refer to Figure 4-217 Connection to Stator for details on the connections and serviceable components.
Figure 4-217 Connection to Stator
Page 194 of 294 - M-SV-001-EN Rev. H 1/23/2023