Energization cycle counter for induction heating tool

• US 6,965,098 B2
• Filed: 09/29/2004
• Issued: 11/15/2005
• Est. Priority Date: 01/02/2004
• Status: Active Grant

• Current Assignee: Ajax Tocco Magnethermic Corporation (Park-Ohio Holdings Corporation)
• Original Assignee: Kathleen M. Bartz
• Inventors: Bartz, Kathleen M.
• Primary Examiner(s): Leung, Philip H.
• Application Number:
  US10/953,800
• Publication Number:
  US 20050145620A1
• Time in Patent Office: 412 Days
• Field of Search: 219660-668, 377/15, 377/16
• US Class Current: 219/663
• CPC Class Codes: H05B 6/06 Control, e.g. of temperature, of power

Abstract

An induction heat treating process with a sensor for monitoring the duration of energization of an induction heating coil each time the induction heating coil is consecutively cycled. The sensor is preferably a counting mechanism attached to or embedded within the induction heating coil and is preferably triggered by and responds to the change in voltage generated as the coil is energized. Alternative means of measuring a cycle may be implemented. The output data from the sensor provides useful information for determining the lifespan of an induction heating coil. Predicting the lifespan of a coil optimizes production by anticipating failure and replacement of a coil during a predetermined down time, limiting on-site inventory, and revolutionizing the billing cycle based on a per cycle cost while decreasing overall production costs and improving inductor coil quality.

Claims

1. A method of monitoring the duration of energization attributable to an induction heating coil comprising the steps of:

providing an induction heating coil with a counting sensor for monitoring the duration of energization of the induction heating coil;

wherein said counting sensor is an identifier of said induction heating coil;

generating a magnetic field about said induction heating coil;

triggering said counting sensor to increase the count in response to said magnetic field and begin measuring the time interval of said duration of energization; and

said identifier triggering an external data source to monitor the duration of energization of the induction heating coil each time said induction heating coil is cycled.

2. The method of claim 1, wherein said counting sensor comprises a sensor for receiving and outputting counting data, said data including

the measurement of a time interval for the measured duration of energization period of said induction heating coil.

3. The method of claim 2, wherein said counting sensor is removably attached to said induction heating coil.

4. The method of claim 2, wherein said counting sensor is embedded within said induction heating coil.

5. The method of claim 2, and further comprising the step of:

said counting sensor monitoring the duration of energization of the induction heating coil each time said sensor is triggered.

6. The method of claim 5, and further comprising the step of:

reading said counting data from said counting sensor.

7. The method of claim 2, and further comprising the step of:

reading said counting data from said counting sensor.

8. The method of claim 1, wherein said counting sensor is removably attached to said induction heating coil.

9. The method of claim 1, wherein said counting sensor is embedded within said induction heating coil.

10. The method of claim 1, and further comprising the step of:

reading said counting data from said external source.

11. A method of monitoring the duration of energization per cycle attributable to an induction heating coil of an induction heating coil assembly, said assembly comprising a power supply and an induction heating coil subassembly including said induction heating coil and a bus bar connecting said coil to said power supply, the method comprising the steps of:

providing an induction heating coil subassembly with a counting sensor;

wherein said counting sensor comprises a sensor for receiving and outputting counting data;

generating a magnetic field about said coil;

triggering said counter when said magnetic field is generated;

wherein said counting sensor monitors the duration of energization of the induction heating coil each time said induction heating coil is cycled when said magnetic field is generated about said coil;

maintaining said coil within said induction heating coil subassembly and continuing to monitor the duration of energization of the induction heating coil each time said induction heating coil is consecutively cycled until said coil fails;

reading said output data of said counting sensor;

wherein said output data comprises the measurement of a time interval for the measured duration of energization period sustained by said coil; and

establishing a baseline lifespan for said coil based on said output data.

12. The method of claim 11, and further comprising the steps of:

providing a series of like induction heating coil subassemblies each with said counting sensor;

generating a magnetic field about each coil of said induction heating coil subassemblies;

triggering each of said counting sensors when said magnetic field is generated;

maintaining each of said coils within said induction heating coil subassemblies and continuing to monitor the duration of energization of each of said induction heating coils each time said induction heating coil is consecutively cycled until each of said coil fails;

reading said output data of each said counting sensors;

wherein said output data comprises the measurement of a time interval for the measured duration of energization period sustained by said coils; and

establishing an average baseline lifespan for said like coils based on said output data.

13. The method of claim 12, and further comprising the steps of:

once said average baseline lifespan is established for said like coils, replacing at least one of said coils with a new like coil upon said failure, wherein said new coil comprises a counting sensor including a sensor for receiving and outputting counting data;

monitoring said duration of energization for each time said induction heating coil is consecutively cycled and sustained by said replaced coil by reading said output data; and

recommending replacing said replaced coil prior to failure of said coil if said measurement of a time interval for the measure duration of energization period is within a predetermined range of said average baseline lifespan for said like coils.

14. The method of claim 13, further comprising the step of:

replacing said replaced coil with a new coil having a counting sensor including a sensor for receiving and outputting counting data.

15. The method of claim 11, and further comprising the step of:

replacing said coil with a new coil upon said failure.

16. The method of claim 11, wherein said counting sensor is removably attached to said bus bar.

17. The method of claim 11, wherein said counting sensor is embedded within said induction heating coil subassembly.

18. A method of monitoring the duration of energization per cycle attributable to an induction heating coil of an induction heating coil assembly comprising a power supply and an induction heating coil subassembly comprising said induction heating coil and a bus bar connecting said induction heating coil to said power supply, wherein an average baseline lifespan for said induction heating coil has been established, the method comprising the steps of:

providing an induction heating coil subassembly with a counting sensor;

wherein said counting mechanism comprises a sensor for receiving and outputting counting data;

generating a magnetic field about said coil;

triggering said counter when said magnetic field is generated;

wherein said counting sensor monitors the duration of energization of the induction heating coil each time said induction heating coil is cycled when said magnetic field is generated about said coil;

reading said output data of said counting sensor;

wherein said output data comprises the measurement of a time interval for the measured duration of energization period sustained by said coil;

monitoring said duration of energization for each time said induction heating coil is consecutively cycled and sustained by said replaced coil by reading said output data; and

recommending replacing said replaced coil prior to failure of said coil if said measurement of a time interval for the measure duration of energization period is within a pre-determined range of said average baseline lifespan for said like coils.

19. The method of claim 18, wherein said counting sensor is removably attached to said bus bar.

20. The method of claim 18, wherein said counting sensor is embedded within said induction heating coil subassembly.

21. The method of claim 18, wherein said counting sensor is triggered by a change in voltage across said induction heating coil subassembly when said power supply is activated.

22. The method of claim 18, wherein said counting sensor is triggered by any one of the following events when said magnetic field is generated about said induction heating coil:

a temperature differential, a current flow differential, a frequency differential, or a magnetic field differential causing a Hall effect.

23. The method of claim 18, further comprising the step of:

replacing said replaced coil with a new coil having a counting sensor including a sensor for receiving and outputting counting data.