@Hbaker7729 ....
At the risk of continuing the hi-jacking of this thread ...
I have tons of these from work (well, very similar) ...
I am interested in investigating a DIY driver for these 3-phase motors ... the first big **IF** is: IF they are truly capable of operation beyond +/- 10% of name-plate RPM ... I suspect they might NOT be. The motor name-plate linked above stated 190Vdc, 310hz and 17,500rpm. 17,500rpm translates to 293 rps (revolutions per second) which would seem to indicate a discrepancy ...
The 310hz drive frequency in a variable speed 3-phase motor would generally indicate an rpm that is a factor of the drive frequency ... for instance, in the common 3-phase spindle motors available from china, 24,000 rpm occurs @ a drive frequency of 400hz ... 24,000/60 = 400hz ... So there is 1:6 direct relationship between rpm and drive frequency ... 300hz = 18,000rpm ... 200hz = 12,000rpm, 100hz = 6,000rpm, 50hz = 3,000rpm ...etc,etc
In the RC world where a "sensorless" driver is typically employed the frequency is obfuscated and replaced by the more familiar "kV" from brushed DC motor specifications where "kV" means RPM/Volt ... In these motors permanent magnets are used in the rotor (regardless if it is an "in-runner" or an "out runner") and the stators are traditional coils. To increase torque in these motors the stator to rotor ratio is defined so that there are numerous electrical cycles per revolution ... to maximize this effect the stators are typically double wound (one clockwise and one counter-clockwise) doubling the number of "stator cogs" per revolution ... But these motors can certainly be driven "synchronously" (ie with a fixed frequency and "sensorless sensing" employed to vary the current, or can simply be driven by a constant voltage source @ any given kV voltage mapped frequency ... ).
Traditional 3-phase motors are "induction motors" ... In an induction motor the "rotor coils" are considered to be a shunted secondary in a transformer ... in the real world these secondaries are laminated iron cores with "shunts" placed in them ... these "shunts" typically look like the cores had slots cut in them and were subsequently filled by welding them closed. This type of rotor is designed to operate at a particular frequency and cannot operate reliably more than +/- 10% of design frequency without excessive current/heat OR significant loss of torque ...
Induction motors are of no interest to me. They are "low cost" engineered solutions for a specific purpose (ie specific voltage/current/frequency/torque) and have no real use outside of design parameters.
If you want to investigate these motors, disassemble a few and see if they employ permanent magnet OR induction rotors... **IF** they are the former then they are of interest to me and there is quite likely a demand for them ... open a new thread AND/OR PM me and we will discuss how to proceed ... if they are the latter (ie induction motors) then your best bet would be to find/create an application for these motors that suits their specific design parameters. Unless there is a large supply of these motors with identical parameters AND there is an equally large demand for these motors; I doubt seriously developing a driver would be worthwhile.
Good Luck!
Fish