1740

Item 1740

DESIGN: Electrotor-SloMo - Motor - Axial Flux - Overview - 3-phase for SloMoCo (and Bilateral?)

Overview:

An axial flux electric motor with one central stator and contra-rotating armatures on each side.

Notes:

Double-sided Counterrotating Machine with Internal Skewed Ring-shaped Core Stator:

The electromagnets will be stationary (stator). A set of permanent magnets will be located on each rotor. The alternate phasing of the electromagnets will synchronize the two rotors. As on alternative A, the relatively slow speed of the rotor blades is achieved because of the large motor diameter, however it does not take advantage of the 2:1 reduction in alternative A.

See this page in conjunction with DESIGN: Electrotor-SloMo - Control - ESC - Three-phase - Power Stage - Overview.

See this page in conjunction with DESIGN: Electrotor-SloMo - Control - ESC - Three-phase - Control Stage - Overview.

Could the means of assuring counter-rotation at startup be used for cyclic during flight?

Axial flux, Rotor - Stator - Rotor, Non-slotted, Three-phase

This picture is a general representation of the following material. The magnet pole count and the coil count may be different. The stator windings will be skewed.

This picture is 1738.gif.

Windings (3-phase):

Delta:

Star, Wye, Y:

The above comes from 'Performance of Disc Brushless DC Motor Applied as Gearless Drive for Wheelchair'

More Information:

OTHER: Electrical - Motor - Winding

Drawings:

General Arraignment:

Voltage changes take place at 30ºº + n*60º electrical degrees.

Coil B is located over coils A and C; so that their copper lengths are similar.

Flux:

Commutation Sequence:


Control word [ABC]			Phase A	Phase B	Phase C
1	0	0	+V_DBC	-V_DBC	NC
0	1	0	NC	+V_DBC	-V_DBC
1	1	0	+V_DBC	NC	-V_DBC
0	1	1	-V_DBC	+V_DBC	NC
1	0	1	NC	-V_DBC	+V_DBC
0	0	1	-V_DBC	NC	+V_DBC

Must a flux barrier be located between the upper and the lower plane of coils? Magnetic Field Shielding

Use Halbach arrays OTHER: Electrical - Motor - Rotor - Permanent Magnet ~ Halbach and slotted stator on later rotors?

Outside Information:

contra rotating prop brushless ~ RC Groups thread

Initially displayed: June 11, 2009 ~ Last Revised: April 7, 2010

The above utility invention is openly and publicly disclosed on the Internet to negate another entity from patenting it. ~ Reference patent law 35 U.S.C. 102 A person shall be entitled to a patent unless - (a) the invention was known ... by others in this country, ..., before the invention thereof by the applicant for patent.