The best replacement for permanent magnet is series wound.

The best alternatives to permanent magnet are rated as following:
★★★★★  series wound
★★★★  electromagnet
★★★  induction motor
★★  electromagnetic
★  induction motors
★  temporary magnet
★  shunt wound
★  induction magnet
  series wound motors
  field coil
  temporary magnets

Your alternative for permanent magnet is not listed? Suggest!
Speaking about permanent magnet, one probably shouldn't forget about electromagnet.

Other search terms related to permanent magnet and their ratings are:
★★★★★ electromagnet
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permanent magnet
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