Direct drive high torque compact synchronous motor
A synchronous motor includes a housing 20 , a stator assembly 30 mounted within the housing 20 , a rotor assembly 40 rotationally mounted within the housing 20 , a rotor shaft 50 having an upper mounting surface 52 attached to the rotor assembly 40 , a bearing assembly 60 coupled to the housing 20 and positioned axially between the rotor assembly 40 and the upper mounting surface 52 , a slip ring assembly 70 supported by the housing 20 and positioned axially at least partially within the stator assembly 30 and the rotor assembly 40 , and an encoder assembly 80 adjacent the slip ring assembly 70.
1. A synchronous motor ( 10 , 110 ) comprises:
a housing ( 20 , 120 );
a stator assembly ( 30 , 130 ) mounted within the housing ( 20 , 120 );
a rotor assembly ( 40 , 140 ) rotationally mounted within the housing ( 20 , 120 );
a rotor shaft ( 50 , 150 ) having an upper mounting surface ( 52 , 152 ) and attached to the rotor assembly ( 40 , 140 );
a bearing assembly ( 60 , 160 ) coupled to the housing ( 20 , 120 ) and the rotor shaft ( 50 , 150 ), wherein the bearing assembly ( 60 , 160 ) is positioned axially between the rotor assembly ( 40 , 140 ) and the upper mounting surface ( 52 , 152 );
a slip ring assembly ( 70 , 170 ) supported by the housing ( 20 , 120 ) and positioned axially at least partially within the stator assembly ( 30 , 130 ) and the rotor assembly ( 40 , 140 ); and
an encoder assembly ( 80 , 180 ) adjacent the slip ring assembly ( 70 , 170 ), wherein the outer diameter of the motor ( 10 , 110 ) is no greater than about 24″ and a height of the motor ( 10 , 110 ) is less than about 20″.
2. The motor ( 10 , 110 ) of claim 1 further including a circulatory fluid cooling system ( 27 , 28 ) which is driven by the rotor assembly ( 40 , 140 ).
3. The motor ( 10 , 110 ) of claim 2 wherein the cooling system ( 27 – 28 ) includes a pump ( 27 ) that is mechanically driven by the rotor assembly ( 40 , 140 ).
4. The motor ( 10 , 110 ) of claim 1 wherein the bearing assembly ( 60 , 160 ) includes a pair of angular contact ball bearings ( 62 , 162 ).
5. The motor ( 10 , 110 ) of claim 4 wherein the ball bearings ( 62 , 162 ) have an internal construction of at least ABEC 5.
6. The motor ( 10 , 110 ) of claim 1 wherein the housing ( 20 , 120 ) includes a pair of ports ( 26 ) for supplying cooling fluid to the motor ( 10 , 110 ), and wherein the stator assembly ( 30 , 130 ) includes a stator housing ( 32 , 132 ) with a plurality of grooves ( 34 , 134 ) receiving the cooling fluid.
7. The motor ( 110 ) of claim 1 wherein the outer diameter of the motor ( 110 ) is no greater than about 15″ and a height of the motor ( 110 ) is less than about 16″.
8. The motor ( 10 ) of claim 1 wherein the motor ( 10 ) has a torque output of up to 3000 Ft-lbs.
9. The motor ( 10 , 110 ) of claim 1 wherein the housing ( 20 , 120 ) further includes pivot posts ( 29 ) for pivotally mounting the motor ( 10 , 110 ).
10. A synchronous motor ( 10 , 110 ) comprises:
a housing ( 20 , 120 );
a stator assembly ( 30 , 130 ) mounted within the housing ( 20 , 120 );
a rotor assembly ( 40 , 140 ) rotationally mounted within the housing ( 20 , 120 );
a rotor shaft ( 50 , 150 ) having an upper mounting surface ( 52 , 152 ) attached to the rotor assembly ( 40 , 140 );
a bearing assembly ( 60 , 160 ) coupled to the housing ( 20 , 120 ) and to the rotor shaft ( 50 , 150 ), wherein the bearing assembly ( 60 , 160 ) is positioned axially between the rotor assembly ( 40 , 140 ) and the upper mounting surface ( 52 , 152 );
a slip ring assembly ( 70 , 170 ) supported by the housing ( 20 , 120 ) and positioned axially at least partially within the stator assembly ( 30 , 130 ) and the rotor assembly ( 40 , 140 ); and
a circulatory fluid cooling system ( 27 , 28 ) which is driven by the rotor assembly ( 40 , 140 ) for circulating cooling fluid through the motor.
11. The motor ( 10 , 110 ) of claim 10 further including an object ( 200 ) to be rotated directly mounted to the mounting surface ( 52 , 152 ), and an encoder assembly ( 80 , 180 ) adjacent the slip ring assembly ( 70 , 170 ).
12. The motor ( 10 , 110 ) of claim 10 wherein the circulatory fluid cooling system ( 27 – 28 ) includes a pump ( 27 ) that is mechanically driven by the rotor assembly ( 40 , 140 ) and wherein the housing ( 20 , 120 ) includes a pair of ports ( 26 ) for supplying the cooling fluid to the motor ( 10 , 110 ), and wherein the stator assembly ( 30 , 130 ) includes a stator housing ( 32 , 132 ) with a grooves ( 34 , 134 ) receiving the cooling fluid.
13. The motor ( 10 , 110 ) of claim 10 wherein the bearing assembly ( 60 , 160 ) includes a pair of angled ball bearings ( 62 , 162 ), wherein the ball bearings ( 62 , 162 ) have an internal construction of at least ABEC 5.
14. The motor ( 10 , 110 ) of claim 10 wherein the motor ( 10 , 110 ) has a torque output of at least up to 340 Ft-lbs, wherein an outer diameter of the motor ( 10 , 110 ) is no greater than about 24″ and a height of the motor ( 10 , 110 ) is less than about 20″.
15. The motor ( 10 , 110 ) of claim 10 wherein the housing ( 20 , 120 ) further includes pivot posts ( 29 ) for pivotally mounting the motor ( 10 , 110 ).
16. A direct drive, synchronous motor ( 10 , 110 ) comprises:
a housing ( 20 , 120 ) having pivot posts ( 29 ) extending there from for pivotally mounting the motor ( 10 , 110 );
a stator assembly ( 30 , 130 ) mounted within the housing ( 20 , 120 );
a rotor assembly ( 40 , 140 ) rotationally mounted within the housing ( 20 , 120 );
a rotor shaft ( 50 , 150 ) having an upper mounting surface ( 52 , 152 ) attached to the rotor assembly ( 40 , 140 );
a bearing assembly ( 60 , 160 ) coupled to the housing ( 20 , 120 ) and to the rotor shaft ( 50 , 150 ), the bearing assembly ( 60 , 160 ) positioned axially between the rotor assembly ( 40 , 140 ) and the upper mounting surface ( 52 , 152 ); and
a slip ring assembly ( 70 , 170 ) supported by the housing ( 20 , 120 ) and positioned axially at least partially within the stator assembly ( 30 , 130 ) and the rotor assembly ( 40 , 140 ), wherein a vestibular testing chair is mounted to the mounting surface ( 52 , 152 ) and wherein the motor ( 10 , 110 ) has a torque output of at least up to 340 Ft-lbs.
17. The motor ( 10 , 110 ) of claim 16 wherein an outer diameter of the motor ( 10 , 110 ) is no greater than about 24″ and a height of the motor ( 10 , 110 ) is less than about 20″.
18. The motor ( 10 , 110 ) of claim 16 wherein the bearing assembly ( 60 , 160 ) includes a pair of angular contact ball bearings ( 62 , 162 ), wherein the ball bearings ( 62 , 162 ) have an internal construction of at least ABEC 5.