System and method of vector drive control for a mining machine

1. A method of controlling a digging operation of an industrial machine, the industrial machine including a dipper, a crowd motor, and a hoist motor, the method comprising:

determining a torque associated with the crowd motor and a torque associated with the hoist motor;

determining a dig force vector for the dipper based on the torque associated with the crowd motor and the torque associated with the hoist motor, the dig force vector including a dig force angle and a dig force magnitude;

determining a value for the dig force angle of the dig force vector; and

controlling, using a processor, the dig force magnitude based on the determined value for the dig force angle, the dig force magnitude being controlled by controlling at least one of the torque associated with the crowd motor and the torque associated with the hoist motor.

2. The method of claim 1 , wherein the torque associated with the crowd motor is controlled by controlling a breakdown torque of the crowd motor.

3. The method of claim 1 , wherein controlling the dig force magnitude includes proportionally controlling the torque associated with the crowd motor and the torque associated with the hoist motor.

4. The method of claim 1 , wherein controlling the dig force magnitude includes disproportionally controlling the torque associated with the crowd motor and the torque associated with the hoist motor.

5. The method of claim 1 , wherein the at least one of the torque associated with the crowd motor or the torque associated with the hoist motor is varied between a minimum torque value corresponding to a first dig force angle boundary and a maximum torque value corresponding to a second dig force angle boundary.

6. The method of claim 5 , further comprising modifying the first dig force angle boundary or the second dig force angle boundary based on a characteristic of the industrial machine.

7. The method of claim 6 , wherein the characteristic of the industrial machine is a position of the dipper.

8. The method of claim 6 , wherein the characteristic of the industrial machine is a force exerted on the dipper.

9. The method of claim 6 , wherein the characteristic of the industrial machine is an operator reference.

10. The method of claim 5 , further comprising increasing the minimum torque value when the dipper approaches a bank.

11. The method of claim 10 , further comprising reducing the maximum torque value when the dipper traverses up the bank.

12. An industrial machine comprising:

a dipper;

a crowd drive configured to provide one or more control signals to a crowd motor, the crowd motor operable to provide a force to the dipper to move the dipper;

a hoist drive configured to provide one or more control signals to a hoist motor, the hoist motor operable to provide a force to the dipper to move the dipper; and

a controller including a processor and connected to the crowd drive and the hoist drive, the controller configured to:

determine a torque of the crowd motor and a torque of the hoist motor;

determine a dig force vector for the dipper based on the torque of the crowd motor and the torque of the hoist motor, the dig force vector including a dig force angle and a dig force magnitude;

determine a value for the dig force angle of the dig force vector; and

control the dig force magnitude based on the determined value for the dig force angle, the dig force magnitude being controlled by controlling at least one of a torque of the crowd motor and a torque of the hoist motor.

13. The industrial machine of claim 12 , wherein the torque associated with the crowd motor is controlled by controlling a breakdown torque of the crowd motor.

14. The industrial machine of claim 12 , wherein controlling the dig force magnitude includes proportionally controlling the torque of the crowd motor and the torque of the hoist motor.

15. The industrial machine of claim 12 , wherein controlling the dig force magnitude includes disproportionally controlling the torque of the crowd motor and the torque of the hoist motor.

16. The industrial machine of claim 12 , wherein the torque of the crowd motor or the torque of the hoist motor is varied between a minimum torque value corresponding to a first dig force angle boundary and a maximum torque value corresponding to a second dig force angle boundary.

17. The industrial machine of claim 16 , further comprising modifying the first dig force angle boundary or the second dig force angle boundary based on a characteristic of the industrial machine.

18. The industrial machine of claim 17 , wherein the characteristic of the industrial machine is selected from the group consisting of a position of the dipper, a force exerted on the dipper, or an operator reference.

19. A method of controlling a digging operation of an industrial machine, the industrial machine including a dipper, a crowd actuator, and a hoist actuator, the method comprising:

determining a force associated with the crowd actuator and a force associated with the hoist actuator;

determining a dig force vector for the dipper based on the force associated with the crowd actuator and the force associated with the hoist actuator, the dig force vector including a dig force angle and a dig force magnitude;

determining a characteristic of the industrial machine; and

controlling, using a processor, the dig force vector based on the characteristic of the industrial machine, the dig force vector being controlled by controlling at least one of the force associated with the crowd actuator, the force associated with the hoist actuator, and an angle of the dipper.

20. The method of claim 19 , wherein the characteristic of the industrial machine is a net force acting on the dipper.

21. The method of claim 19 , wherein the characteristic of the industrial machine is a position of the dipper.

22. The method of claim 21 , wherein the position of the dipper corresponds to a position of a point on the dipper.

23. The method of claim 22 , wherein the point on the dipper is a point at which the dipper engages a bank.