Brushless electro-mechanical machine

Abstract

An electromotive machine comprises a stator element and a rotor element, the stator element including at least one set of four toroidally shaped electromagnetic members, the electromagnetic members arranged along an arc a predetermined distance apart defining a stator arc length. Each of the members has a slot, and the rotor element comprises a disc adapted to pass through the slots. The disc contains a plurality of permanent magnet members spaced side by side about a periphery thereof and arranged so as to have alternating north-south polarities. These permanent magnet members are sized and spaced such that within the stator arc length the ratio of stator members to permanent magnet members is about four to six. The electromagnetic members are energized in a four phase push-pull fashion to create high torque and smooth operation.

1 . An electromotive machine comprising a stator element and a rotor element, the stator element including at least one set of four toroidally shaped electromagnetic members, said electromagnetic members arranged along an arc a predetermined distance apart defining a stator arc length, each of said members having a slot, the rotor element comprising a disc adapted to pass through said slots, said disc containing a plurality of permanent magnet members spaced side by side about a periphery thereof and arranged so as to have alternating north-south polarities, the permanent magnet members being sized and spaced such that within said stator arc length the ratio of stator members to permanent magnet members is about four to six.  
     
     
         2 . The electromotive machine of  claim 1 , further including at least a second set of four toroidally shaped electromagnet members positioned symmetrically with respect to said first set along said arc.  
     
     
         3 . The electromotive machine of  claim 1 , further including at least one motor drive electronics module for energizing said set of electromagnet members with current according to a predetermined sequence.  
     
     
         4 . The electromotive machine of  claim 3 , further including Hall effect sensors situated adjacent selective ones of said electromagnetic members and providing trigger signals to said electronics module to enable said electronics module to execute said predetermined sequence.  
     
     
         5 . The electromotive machine of  claim 1  wherein each of said permanent magnet members are spaced about 10° apart as measured between radial lines extending through a center of each magnet member.  
     
     
         6 . An electromotive machine comprising 
 (a) a stator assembly including at least one electromagnet module, said electromagnet module comprising at least four electromagnetic members spaced about 15° apart, each of said electromagnetic members having a slot, said electromagnetic members arranged side by side wherein said slots are aligned with each other, and    (b) a rotor assembly comprising a rotary member having a periphery, the rotary member including a plurality of permanent magnet members arranged about said periphery side by side in alternating north-south polarities and spaced about 10° apart.    
     
     
         7 . The electromotive machine of  claim 6 , further including a driver circuit coupled to said electromagnet module for energizing said electromagnetic members in an alternating polarity sequence.  
     
     
         8 . The electromotive machine of  claim 7 , further including Hall effect sensors spaced along said lineal space adjacent to said permanent magnet members for providing trigger signals to said driver circuit.  
     
     
         9 . The electromotive machine of  claim 6  wherein said stator assembly includes at least a pair of electromagnet modules.  
     
     
         10 . The electromotive machine of  claim 9  wherein said rotary member is a disk or wheel.  
     
     
         11 . The electromotive machine of  claim 10  wherein said permanent magnet members are disc-shaped.  
     
     
         12 . The electromotive machine of  claim 13  wherein each permanent magnet member has a diameter, and a spacing between adjacent permanent magnet members does not exceed 10% of said diameter.  
     
     
         13 . The electromotive machine of  claim 6  wherein the stator and rotor assemblies are configured as a linear actuator.  
     
     
         14 . The electromotive machine of  claim 6 , further including a switching module for switching said driver circuit off and for coupling an output of said stator assembly to a rectifier circuit for charging a battery.  
     
     
         15 . The electromotive machine of  claim 1 , further including a drive circuit for providing drive current to said electromagnetic members thereby causing said rotor to rotate, and a switching module for turning off said drive circuit thereby allowing said stator module to provide current to charge a battery.