Although 'permanent excitation' is rarely used except in the form 'permanently excited motor'.

sample refs:

AC 3 Phase Synchronous Motors

A synchronous motor consists of a DC field winding on its rotor, a three-phase winding on its stator and a means to bring it to speed (usually a squirrel cage winding placed in the salient poles on the rotor).

A synchronous motor is started as an induction motor or by a separate induction motor. When the motor comes up to speed, the DC excitation is supplied to the field winding and the motor pulls into synchronism. No voltage is generated in the auxiliary rotor winding during synchronous operation.

The DC excitation is provided by an exciter driven either from the motor's shaft or by a separate motor. To reduce maintenance, brushless synchronous motors are now being manufactured. An alternator mounted on the motor shaft replaces the exciter. The AC from the alternator is converted to DC by bridge connected silicon diodes and then supplied directly to the field winding. This arrangement eliminates the exciter, commutator and the field slip rings.

The ability of a synchronous motor to operate at leading power factor makes it suitable to be used for power factor improvement. When a synchronous motor is used exclusively for power factor improvement and not for driving any mechanical load, it is called a synchronous condenser.
www.energymanagertraining.com/power_plants/Electricity and ...

The primary feature which differentiates Written-Pole® single-phase motors from more conventional designs is a continuous layer of ferrite magnets on the surface of the rotor along with a high-density exciter winding contained within the stator winding.
www.meridiumpower.ca/A/body_a_1_1.html

Key Publishing Ltd Aviation Forums - Indian Submarine Battle ...
The propulsion motor is a Siemens Permasyn (Type FR6439-3900KW) low-speed permanently excited electric motor driving a low-noise, skewback 7-blade propeller ...
forum.keypublishing.co.uk/ showthread.php?goto=lastpost&t=42627