Exercise machine with pancake motor

1. An exercise machine comprising:

a pancake motor, wherein the pancake motor is in an out-runner configuration;

a torque controller coupled to the pancake motor;

a spool coupled to the pancake motor, and a cable wound about the spool; and

at least one encoder, wherein the at least one encoder determines at least one of position of the pancake motor and position of an actuator; and

wherein the pancake motor uses cable tension and gravity to move a slider up and down to desired positions for an arm.

2. The exercise machine of claim 1 , further comprising a voltage stabilizer coupled to the pancake motor to dissipate power.

3. The exercise machine of claim 1 , further comprising an encoding pattern that uses phase to determine direction associated with the at least one encoder.

4. The exercise machine of claim 1 , wherein the arm positions the cable.

5. The exercise machine of claim 4 , wherein the arm has an ability to pivot.

6. The exercise machine of claim 4 , wherein the arm has an ability to translate.

7. The exercise machine of claim 1 , wherein the exercise machine is a strength training machine.

8. The exercise machine of claim 1 , further comprising a differential coupled to the pancake motor.

9. The exercise machine of claim 8 , wherein the spool comprises a first spool, and further comprising a second spool, wherein each spool is coupled to the differential.

10. The exercise machine of claim 9 , wherein the arm comprises a first arm, wherein the cable comprises a first cable, and further comprising: a second arm; and a second cable, wherein: the first cable is wound about the first spool; the second cable is wound about the second spool; the first arm positions the first cable; and the second arm positions the second cable.

11. The exercise machine of claim 10 , wherein the pancake motor, first spool, and second spool are mounted near a top of the exercise machine.

12. The exercise machine of claim 10 , wherein the pancake motor, first spool, and second spool are mounted near a bottom of the exercise machine.

13. The exercise machine of claim 10 , wherein the first cable and the second cable are routed over a top of the exercise machine.

14. The exercise machine of claim 1 , further comprising a low profile gear box coupled to the pancake motor.

15. The exercise machine of claim 1 , further comprising a low profile differential coupled to the pancake motor.

16. The exercise machine of claim 1 , wherein the exercise machine is low profile.

17. The exercise machine of claim 1 , wherein the pancake motor comprises a first pancake motor, and further comprising a second pancake motor.

18. The exercise machine of claim 17 , wherein the spool comprises a first spool, and further comprising a second spool, wherein the first spool is coupled to the pancake motor, and wherein the second spool is coupled to the second pancake motor.

19. The exercise machine of claim 18 , wherein the arm comprises a first arm, wherein the cable comprises a first cable, and further comprising: a second arm; and a second cable, and wherein: the first cable is wound about the first spool; the second cable is wound about the second spool; the first arm positions the first cable; and the second arm positions the second cable.

20. The exercise machine of claim 1 , further comprising a wall bracket, wherein the exercise machine at least in part hangs on the wall bracket.

21. The exercise machine of claim 1 , wherein the pancake motor has teeth compatible with a belt integrated into a body of the pancake motor along an outer circumference.