Brushless commutated torque motor for use with a rotary low frequency sound reproducing apparatus

A brushless commutated torque motor comprising:

• a shaft;
• a position sensor;
• a rotor having a plurality of permanent magnet rotor pole sectors, said rotor mounted for rotation upon said shaft;
• and
• a stator having a plurality of stator poles and stator winding slots disposed alternately thereon, each of said stator winding slots having stator windings therein driven by an individual power amplifier in response to a control signal, said stator having commutation between stator windings controlled by sensing of rotor angular position by said position sensor, each rotor pole being configured and disposed such that a plurality of adjacent stator windings having the same polarity is axially adjacent to said rotor pole sector and each rotor pole sector is angularly separated from adjacent rotor pole sectors by a selected number of stator windings, and wherein during operation electronically-controlled commutation occurs in those stator windings not axially adjacent to rotor pole sectors.

A brushless commutated torque motor comprising;

• a shaft;
• a position sensor;
• a rotor having a plurality of permanent magnet rotor pole sectors, said rotor mounted for rotation upon said shaft, each rotor pole and each rotor pole sector being angularly separated from adjacent rotor pole sectors by an angular space;
• a stator having a plurality of stator poles and stator winding slots disposed alternately thereon, each of said stator winding slots having stator windings therein being configured and disposed such that a plurality of adjacent stator windings having the same polarity is axially adjacent to each rotor pole sector;
• and
• a stator commutation means controlled by sensing of rotor angular position by said position sensor and wherein during operation electronically-controlled commutation occurs only in those stator windings not axially adjacent to rotor pole sectors.

A brushless commutated torque motor comprising:

• a shaft;
• a position sensor;
• a rotor having a plurality of permanent magnet rotor pole sectors, said rotor mounted for rotation upon said shaft, each rotor pole and each rotor pole sector being angularly separated from adjacent rotor pole sectors by an angular space;
• a stator having a plurality of stator poles and stator winding slots disposed alternately thereon, each of said stator winding slots having stator windings therein being configured and disposed such that a plurality of adjacent stator windings having the same polarity is axially adjacent to each rotor pole sector;
• and
• a stator commutation means controlled by sensing of rotor angular position by said position sensor and wherein during operation electronically-controlled commutation occurs in those stator windings adjacent to stator windings having opposite polarity.