# US 10,479,496 B2 · Magnetic orientation detent with motor assist > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,496 B2 - Document ID: US10479496B2 - Status: Granted - Kind: B2 - Application number: 15/338,832 - Filed: 2016-10-31 - Published: 2018-05-03 - Granted: 2019-11-19 - Earliest claimed: 2016-10-31 - Assignees: Lockheed Martin Corporation - Applicants: Lockheed Martin Corporation - Inventors: Dustin Eli Gamble; Gordon Jennings; Justin Neel - Web page: https://patentgrep.com/patent/US10479496B2 ## CPC - B64C 29/0025: {the propellers being fixed relative to the fuselage} - B64C 27/30: with provision for reducing drag of inoperative rotor - H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)} - H02K 7/02: Additional mass for increasing inertia, e.g. flywheels - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02P 3/025: {holding the rotor in a fixed position after deceleration} - B64C: AEROPLANES; HELICOPTERS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract In one embodiment, a magnetic orientation detent includes a motor coupled to a motor shaft, the motor mechanically coupled to a motor mount. The magnetic orientation detent may also include a flywheel mechanically coupled to a distal end of the motor shaft. The magnetic orientation detent may further include a first plurality of magnets coupled to the motor mount and a second plurality of magnets coupled to the flywheel. The second plurality of magnets couple magnetically to the first plurality of magnets. ## Claims ### Claim 1 A aircraft, comprising: a fixed-wing propulsion system; a multirotor propulsion system, the multirotor propulsion system comprising: a propeller coupled to a first distal end of a motor shaft, the motor shaft drivable using a motor; a motor mount mechanically coupled to the motor, the motor mount coupling the motor to the multirotor propulsion system; a flywheel mechanically coupled to a second distal end of the motor shaft; and a magnetic orientation detent, the magnetic orientation detent comprising: a first plurality of magnets coupled to the motor mount; and a second plurality of magnets coupled to the flywheel; and further comprising a processor, the processor operable to execute a locking drive scheme, wherein the locking drive scheme causes the motor to drive the motor shaft to rotate with a torque having a force less than the force needed to overcome magnetic coupling of the first and second plurality of magnets and lock the propeller in line with a flight direction of the aircraft. ### Claim 2 (depends on 1) The aircraft of claim 1, wherein: the first plurality of magnets coupled to the motor mount comprise a first magnet and a second magnet, the first and second magnets having a first magnetic polarity oriented in towards the second plurality of magnets; and the second plurality of magnets coupled to the flywheel comprise a third magnet and a fourth magnet, the third and fourth magnets having a second magnetic polarity oriented towards the first plurality of magnets, wherein the second magnetic polarity is opposite that of the first magnetic polarity. ### Claim 3 (depends on 1) The aircraft of claim 1, further comprising: an encoder coupled to the motor, the encoder operable to determine a locked position of the motor shaft, wherein the locked position corresponds to a position of the motor shaft when the first and second plurality of magnets are aligned and magnetically coupled. ### Claim 4 (depends on 1) The aircraft of claim 1, wherein the torque is determined by a duty cycle applied to the motor, the duty cycle calculated based on a power supply voltage of the aircraft. ### Claim 5 (depends on 3) The aircraft of claim 3, wherein the locking drive scheme is applied to the motor in response to the encoder determining that the motor shaft is not in the locked position. ### Claim 6 (depends on 1) The aircraft of claim 1, wherein the first and second plurality of magnets are comprised of Neodymium-Iron-Boron. ### Claim 7 A method for applying a magnetic orientation detent, the method comprising: flying a aircraft using a multirotor propulsion system and a fixed-wing system, the multirotor propulsion system comprising: a propeller coupled to a first distal end of a motor shaft; a motor coupled to the multirotor propulsion system using a motor mount, the motor operable to drive the motor shaft; and a flywheel mechanically coupled to a second distal end of the motor shaft; removing power from the motor of the multirotor propulsion system; locking the propeller of the multirotor propulsion system using a magnetic orientation detent, the magnetic orientation detent comprising: a first plurality of magnets mechanically coupled to the motor mount; and a second plurality of magnets mechanically coupled to the flywheel; and wherein the first and second plurality of magnets magnetically couple when power is removed from the multirotor propulsion stem; and wherein locking the propeller comprises locking the propeller in line with a flight direction of the aircraft. ### Claim 8 (depends on 7) The method of claim 7, further comprising: applying a locking drive scheme to the motor of the multirotor device, wherein upon applying the locking drive scheme the motor rotates the motor shaft with a torque having a force less than the force needed to overcome the magnetic coupling of the first and second plurality of magnets. ### Claim 9 (depends on 8) The method of claim 8, further comprising: determining, using an encoder coupled to the motor, a position of the motor shaft; and applying the locking drive scheme to the motor in response to the position of the motor shaft indicating that the first and second plurality of magnets are not magnetically coupled. ### Claim 10 (depends on 8) The method of claim 8, wherein the torque is determined by a duty cycle applied to the motor, the duty cycle calculated based on a power supply voltage of the aircraft. ### Claim 11 (depends on 7) The method of claim 7, further comprising: powering the multirotor propulsion system, wherein in response powering the multirotor propulsion system, the motor shaft overcomes the magnetic coupling created by the first and second plurality of magnets. ### Claim 12 (depends on 7) The method of claim 7, wherein the first and second plurality of magnets are comprised of Neodymium-Iron-Boron. ### Claim 13 A magnetic orientation detent, comprising: a motor coupled to a motor shaft; a motor mount, the motor mechanically coupled to the motor mount; a flywheel mechanically coupled to a distal end of the motor shaft; a first plurality of magnets coupled to the motor mount; a second plurality of magnets coupled to the flywheel, the second plurality of magnets are coupled magnetically to the first plurality of magnets; further comprising a processor, the processor programmable to implement a locking the drive scheme, wherein the locking drive scheme causes the motor to drive the motor shaft to rotate with a torque having a force less than the force needed to overcome the magnetic coupling of the first and second plurality of magnets; and wherein the locking drive mechanism locks a propeller associated with the magnetic orientation detent in line with a flight direction of an aircraft. ### Claim 14 (depends on 13) The magnetic orientation detent of claim 13, further comprising: an encoder coupled to the motor, the encoder operable to determine a locked position of the motor shaft, wherein the locked position corresponds to a position of the motor shaft when the first and second plurality of magnets are aligned. ### Claim 15 (depends on 14) The magnetic orientation detent of claim 14, where the locking drive scheme is applied to the motor in response to the encoder determining that the motor shaft is not in the locked position. ### Claim 16 (depends on 13) The magnetic orientation detent of claim 13, wherein the first and second plurality of magnets are comprised of Neodymium-Iron-Boron. ### Claim 17 (depends on 13) The magnetic orientation detent of claim 13, wherein the flywheel is coupled to the distal end of the motor shaft below the motor mount.