Oscillatory motors and devices incorporating them
An oscillatory device incorporating a limited angle torque motor capable of oscillating one or more end effector(s) is provided. The device may additionally incorporate an ultrasound transducer and/or a waveguide structure.
1. An oscillatory motor comprising a rotor assembly, a drive shaft mounted to move with the rotor assembly, a stator assembly, and a centering mechanism, wherein the rotor assembly incorporates at least one permanent magnet having an even number of poles, the stator assembly incorporates a toroidal coil assembly having at least one toroid core with a coil winding mounted outside and concentrically with the magnetic rotor, whereby when the toroidal coil assembly is energized, the rotor assembly and drive shaft are rotated with respect to the toroidal coil assembly from a neutral position through an arc or an angular displacement of less than 180° and the drive shaft is returned to a neutral position by the centering mechanism, and wherein the rotor assembly and drive shaft are rotated in opposite directions from the neutral position with respect to the toroidal coil assembly when the polarity of the input current is changed.
2. An oscillatory motor of claim 1 , wherein the rotor assembly comprises a single permanent magnet having two opposing poles and the stator assembly comprises at least two core sections assembled to provide a toroidal core.
3. An oscillatory motor of claim 1 , wherein at least one drive shaft segment is mounted in a stationary structure and remains stationary during rotation of the rotor assembly.
4. An oscillatory motor of claim 1 , wherein the centering mechanism is a spring.
5. An oscillatory motor of claim 4 , wherein the centering mechanism is a torsion spring.
6. An oscillatory motor of claim 5 , wherein the torsion spring is formed integrally with the drive shaft as a smaller diameter drive shaft section.
7. An oscillatory motor of claim 4 , wherein the centering mechanism is mounted inside the magnetic rotor.
8. An oscillatory motor of claim 1 , wherein the angular output of a drive portion of the drive shaft is less than 10° in each direction from the neutral position.
9. An oscillatory device comprising: a handle housing a power supply and an oscillatory motor having a rotor assembly, a drive shaft mounted to move with the rotor assembly, a stator assembly, and a centering mechanism, wherein the rotor assembly incorporates at least one permanent magnet having an even number of poles, the stator assembly is mounted outside and concentrically with the magnetic rotor and incorporates a toroidal coil assembly having at least one toroid core with a coil winding, whereby when the stator assembly is energized, the rotor assembly and drive shaft move from a neutral position through an arc or an angular displacement and, when the stator assembly isn't energized, the drive shaft is returned to the neutral position by the centering mechanism, and the rotor assembly and drive shaft are rotated in opposite directions from the neutral position with respect to the toroidal coil assembly when the polarity of the input current is changed; and an accessory that is adapted to be mechanically coupled to the drive shaft; wherein the combination of the oscillatory motor and the accessory form a resonant system.
10. An oscillatory device of claim 9 , wherein the resonant frequency of the resonant system is between 20 Hz and 10,000 Hz.
11. An oscillatory device of claim 9 , wherein resonant frequency of the resonant system is greater than about 50 Hz and less than about 500 Hz.
12. An oscillatory device of claim 9 , wherein the power supply is a rechargeable battery mounted in the handle.
13. An oscillatory device of claim 12 , wherein the rechargeable battery is inductively chargeable, and a charge coil and a charge core are additionally mounted in the handle.
14. An oscillatory device of claim 13 , additionally comprising a charger assembly including an inductive charger base for inductive charging of the rechargeable battery, a cord detachably connectable to the charger base at one end and connectable to an electrical source by means of a plug at the other end.
15. An oscillatory device of claim 14 , wherein the charger base incorporates charging elements that permit inductive charging of rechargeable batteries from multiple sources, including alternating current sources and direct current sources.
16. An oscillatory device of claim 9 , wherein the accessory is detachable from the handle.