Dual pinion drive system

• US 8,866,418 B2
• Filed: 02/11/2013
• Issued: 10/21/2014
• Est. Priority Date: 08/10/2010
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Keller, Robert, Mercangoez, Mehmet, Papafotiou, Georgios
• Primary Examiner(s): Santana, Eduardo Colon
• Assistant Examiner(s): AGARED, GABRIEL T
• Application Number:
  US13/764,101
• Publication Number:
  US 20130157805A1
• Time in Patent Office: 617 Days
• Field of Search: 318/34, 318/69, 318/286, 318/434, 318/466
• US Class Current: 318/34
• CPC Class Codes: G05B 2219/41166 Adaptive filter frequency as function of oscillation, rigidity, inertia load
• CPC Class Codes: G05B 5/01 electric
• CPC Class Codes: G05D 17/02 characterised by the use of electric means
• CPC Class Codes: H02P 5/46 for speed regulation of two or more dynamo-electric motors in relation to one another
• CPC Class Codes: H02P 5/50 by comparing electrical values representing the speeds
• CPC Class Codes: H02P 5/505 using equalising lines, e.g. rotor and stator lines of first and second motors

Abstract

A system and method are disclosed for controlling electrical machines including a controller component which receives a first signal providing a measured parameter of the electrical machine and a second signal providing a reference parameter of the electrical machine, using the first and second signals being used to produce a first control signal. A first filter component receives the first signal from the electrical machine and uses the first signal to produce a second control signal. A second filter component receives a third signal which relates to a reference parameter of a second electrical machine and uses the third signal to produce a third control signal. The system and second control signals are used to produce a first output control signal for provision to the first electrical machine, and the first and third control signals are used produce a second output control signal for provision to the second electrical machine.

Claims

1. A control system for controlling a mechanical system having first and second electrical machines, the control system comprising:

a controller component, a first output component, a second output component, a first filter component, and a second filter component;

wherein the controller component is operable to receive a first signal which relates to a measured parameter of a first electrical machine and a second signal which relates to a reference parameter of the first electrical machine, the controller component being operable to use the first signal and the second signal to produce a first control signal;

the first filter component is operable to receive the first signal from the first electrical machine and to use the first signal to produce a second control signal;

the second filter component is operable to receive a third signal which relates to a measured parameter of a second electrical machine and to use the third signal to produce a third control signal;

the first output component is operable to receive the first control signal and the second control signal and to combine the first and second control signals to produce a first output control signal for provision to the first electrical machine; and

the second output component is operable to receive the first control signal and the third control signal and to combine the first and third control signals to produce a second output control signal for provision to the second electrical machine.

2. A control system as claimed in claim 1, wherein the first signal comprises a measured rotational speed of the first electrical machine, the second electrical signal comprises a reference rotational speed of the first electrical machine, and the third signal comprises a measured rotational speed of the second electrical machine.

3. A control system as claimed in claim 1, wherein the third signal comprises a reference rotational speed.

4. A control system as claimed in claim 1, in combination with first and second electrical machines, each mechanically coupled to a load.

5. A control system as claimed in claim 4, wherein each mechanical coupling is a flexible coupling.

6. A control system as claimed in claim 1, in combination with first and the second electrical machines which each act upon a load, and wherein the first and the second electrical machines are mechanically coupled to one another via the load.

7. A control system as claimed in claim 6, wherein each mechanical coupling is a flexible coupling.

8. A control system as claimed in claim 1, wherein the third signal comprises a reference rotational speed.

9. A control system as claimed in claim 1, wherein a combination of the first and second control signals in the first output component to produce a first output control signal comprises the subtraction of the second control signal from the first control signal.

10. A control system as claimed in claim 1, wherein the first filter component and the second filter component each comprise a band pass filter.

11. A control system as claimed in claim 1, wherein a filter functions of the first filter component and the second filter component comprise a natural frequency of the mechanical system.

12. A control system as claimed in claim 11, wherein the filter functions of the first filter component and the second filter component comprise a first natural frequency of the mechanical system.

13. A control system as claimed in claim 11, wherein the filter functions of the first filter component and the second filter component comprise

14. A control system as claimed in claim 1, wherein the mechanical system comprises a dual pinion drive system.

15. A control system as claimed in claim 1, wherein the mechanical system comprises a dual pinion drive cement mill.

16. A control system as claimed in claim 1, wherein the controller component comprises a PI controller.

17. A method for controlling a mechanical system having first and second electrical machines, the method comprising:

receiving a first signal relating to a measured rotational speed of the first electrical machine;

receiving a second signal relating to a first reference rotational speed of the first electrical machine;

receiving a third signal relating to a measured rotational speed of a second electrical machine;

producing a first control signal from the first and second signals using a controller component;

producing a second control signal from the first signal using a first filter component;

producing a third control signal from the third signal using a second filter component;

producing a first output control signal from the first and the second control signals using a first output component;

producing a second output control signal from the first and third control signals using a second output component;

supplying the first output control signal to the first electrical machine; and

supplying the second output control signal to the second electrical machine.

18. A method as claimed in claim 17, comprising:

mechanically coupling each of the first and second electrical machines to a load.

19. A method as claimed in claim 17, comprising:

mechanically coupling the first and second electrical machines to one another via a load, and wherein the first and the second electrical machines each act upon the load.