Method and apparatus for transferring signal data

• US 8,253,354 B2
• Filed: 12/18/2008
• Issued: 08/28/2012
• Est. Priority Date: 12/18/2007
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: Abb Oy (ABB Limited)
• Inventors: Niemi, Mika
• Primary Examiner(s): Ip, Paul
• Application Number:
  US12/338,406
• Publication Number:
  US 20090177295A1
• Time in Patent Office: 1,349 Days
• Field of Search: 318/16, 318/685, 318/696, 318/563, 318/280, 318/630, 318/807, 318/560, 375/285, 375/260, 375/267, 455/59, 455/101
• US Class Current: 318/16
• CPC Class Codes: G01S 5/0018 Transmission from mobile station to base station
• CPC Class Codes: G06F 17/17 Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method G06F17/18 takes precedence ; interpolation for numerical control G05B19/18

Abstract

The invention relates to a method and device for transferring signal data from a sender to one or more receivers. The invention includes receiving a quantity as a function of time, arranging the quantity into a first polynomial to obtain values for polynomial coefficients of a first continuous signal, and transferring the values of the polynomial coefficients of the first continuous signal via a first data transfer link to one or more receivers.

Claims

1. A method of motor drive control for transferring signal data to one or more receivers, comprising:

receiving a quantity as function of time,

arranging the quantity into a first polynomial to obtain values of polynomial coefficients of a first continuous-time signal,

transferring the values of the polynomial coefficients of the first continuous-time signal via a first data transfer link to one or more receivers,

transferring the values of the polynomial coefficients of the first continuous-time signal to a first polynomial element of a receiver,

transferring the values of the polynomial coefficients of the second continuous-time signal to a second polynomial element of the receiver,

receiving a synchronization mark from a first element,

storing the value of a time counter at the time of receipt,

receiving a synchronization mark from a second element,

storing the value of a time counter at the time of receipt, and

producing one or more control functions to a control element on the basis of the values of the coefficients of one or more continuous-time polynomials and/or one or more time counter values of the receiving end for controlling the motor drive.

2. The method as claimed in claim 1, comprising:

receiving a target value of the quantity as a first function of time,

arranging the target value into the first polynomial to obtain the values of the polynomial coefficients of the first continuous-time signal,

receiving a measured actual value of the quantity as a second function of time,

arranging the actual value into a second polynomial to obtain value of polynomial coefficients of a second continuous-time signal,

transferring the values of the polynomial coefficients of the first continuous-time signal via a first data transfer link to one or more receivers, and

transferring the values of the polynomial coefficients of the second continuous-time signal via a second data transfer link to one or more receivers.

3. The method as claimed in claim 1, wherein the control function may be a sum, difference, multiplication, division, derivation, and/or integration of the polynomials or a combination thereof.

4. The method as claimed in claim 1, comprising:

obtaining from the control element a continuous-time control, and

converting the continuous-time control to a discrete-time control.

5. The method as claimed in claim 1, wherein the discrete-time control is torque control and that this controls a frequency converter that produces one or more signals for directing, adjusting, or controlling a motor.

6. The method as claimed in claim 1, wherein the first and second data transfer link is the same data transfer link.

7. The method as claimed in claim 1, wherein the first and/or second data transfer link comprises the exact temporal synchronization of the sending and receiving ends and the forwarding of numerical information.

8. The method as claimed in claim 1, comprising:

approximating a target signal and/or measured signal with a third- or fourth-degree polynomial.

9. The method as claimed in claim 1, comprising:

calculating the value of a polynomial in such a manner that a time variable obtains its value in relation to a given internal and/or external time stamp, signal, trigger, or a combination thereof.

10. A motor drive device for transferring signal data, comprising:

a receiver for receiving a quantity as a function of time via a first data transfer link;

a processor for arranging the quantity into a first polynomial to obtain values of polynomial coefficients of a first continuous-time signal, and for transferring the values of the polynomial coefficients of the first continuous-time signal via the first data transfer link to the receiver; and

a non-transitory computer readable storage medium for storing computer executable instructions, which when in communicative contact with a computer causes the processor to execute the steps of;

transferring the values of the polynomial coefficients of the first continuous-time signal to a first polynomial element of a receiver,

transferring the values of the polynomial coefficients of the second continuous-time signal to a second polynomial element of the receiver,

receiving a synchronization mark from a first element,

storing the value of a time counter at the time of receipt,

receiving a synchronization mark from a second element,

storing the value of a time counter at the time of receipt, and

producing one or more control functions to a control element on the basis of the values of the coefficients of one or more continuous-time polynomials and/or one or more time counter values of the receiving end for controlling the motor drive.

11. The device as claimed in claim 10, comprising:

wherein the non-transitory computer readable storage medium causes the processor to execute;

receiving a target value of the quantity as a first function of time;

arranging the target value into a first polynomial to obtain the values of the polynomial coefficients of the first continuous-time signal;

measuring an actual value of the quantity as a second function of time;

transferring the actual value to a second element to arrange the actual value into a second polynomial to obtain values of polynomial coefficients of the second continuous signal;

transferring the values of the polynomial coefficients of the first continuous-time signal via the first data transfer link to one or more receivers; and

transferring the values of the polynomial coefficients of the second continuous-time signal via the second data transfer link to one or more receivers.

12. A motor drive device for receiving signal data, comprising:

receiving values of polynomial coefficients of a first continuous-time signal from a device of claim 10 to a polynomial coefficient element;

receiving values of polynomial coefficients of a second continuous-time signal from the device of claim 10 to a polynomial coefficient element;

receiving a first synchronization mark from a first element;

storing a value of a time counter at the time of receipt;

receiving a second synchronization mark from a second element;

storing a value of a time counter at the time of receipt; and

producing one or more control functions for a control element on the basis of one or more continuous-time polynomial coefficients and/or one or more time counter values of the receiving end for controlling the motor drive.

13. A tangible computer readable storage medium for motor drive control comprising instructions, that when executed by a computer, cause the computer to

receive a quantity as function of time,

arrange the quantity into a first polynomial to obtain values of polynomial coefficients of a first continuous-time signal,

transfer the values of the polynomial coefficients of the first continuous-time signal via a first data transfer link to one or more receivers,

transfer the values of the polynomial coefficients of the first continuous-time signal to a first polynomial element of a receiver,

transfer the values of the polynomial coefficients of the second continuous-time signal to a second polynomial element of the receiver,

receive a synchronization mark from a first element,

store the value of a time counter at the time of receipt,

receive a synchronization mark from a second element,

store the value of a time counter at the time of receipt, and

produce one or more control functions to a control element on the basis of the values of the coefficients of one or more continuous-time polynomials and/or one or more time counter values of the receiving end for controlling the motor drive.