US RE50,111 E1
Variable frequency electrostatic drive
Aditya N. Ghule, Madison, WI (US); Baoyun Ge, Madison, WI (US); and Daniel Colin Ludois, Madison, WI (US)
Assigned to Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed by Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed on Jun. 7, 2018, as Appl. No. 16/003,057.
Application 16/003,057 is a continuation in part of application No. 15/453,347, filed on Mar. 8, 2017, granted, now 9,960,719, issued on May 1, 2018.
Application 16/003,057 is a reissue of application No. 15/820,829, filed on Nov. 22, 2017, granted, now 9,979,323, issued on May 22, 2018.
This patent is subject to a terminal disclaimer.
Int. Cl. H01L 41/04 (2006.01); H02N 1/00 (2006.01)
CPC H02N 1/008 (2013.01) [H02N 1/004 (2013.01)] 19 Claims
OG exemplary drawing
 
[ 21. A variable speed drive for an electrostatic motor of a type having a stator with multiple stator electrodes adapted to generate a rotating stator electric field vector about an axis and a rotor having multiple rotor electrodes providing a rotor electric field interacting with the rotating electric field primarily by electrostatic forces rather than magnetic forces, the variable speed drive comprising:
a set of current-source drives adapted to connect to the multiple stator electrodes serving to regulate current to the stator electrodes and regulating current output to the motor to within 25 percent of a command value;
a rotor position determination system providing a position signal;
an ABC-dq transformation circuit receiving the position signal from the rotor position determination system and measures of outputs of the current-source drives to develop a measured d-q vector;
an input for receiving the desired d-q vector;
a comparison circuit providing an error vector based on the measured d-q vector and desired d-q vector; and
a dq-ABC transformation circuit receiving the position signal and providing an output based on the error vector to develop a set of electrode signals provided to the current-source drives for driving the stator electrodes;
where in the current-source drives provide a set of electrical switches in series with a current source implemented by an inductance serving to regulate current to the stator electrodes. ]