Really simple conventional brushed motor for groups of students.
This set is deeply discounted and does not have a volume discount. However if you buy 3 sets or more you get free RPM measurement attachment – your students will be able to compare the speed of their motors (frequency measurement multimeter required – you may buy inexpensive advanced multimeter here if you do not have one).
If you buy 5 sets or more you also get Rapid Assembly QuikLock Reed Switch Motor Kit #12 (so you can compare and see why it is really much better!).
Please note that while this is the least expensive kit it is not the easiest motor to build as it requires a lot of accuracy in balancing the coil and stripping off the insulation. They are also not very stable and require frequent cleaning. Practically nothing could be attached to these motors and no experiments could be performed besides the basic speed measurement.
Reed switch motors are easier to build and understand how they work. They have a proven record of working every time without any struggle.
This is not a brushless motor as opposed to most other motors on our site.