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Piezo Ignitors

Piezo Ignitors
  • small, low cost assemblies
  • squeeze activation or impact activation
  • large volume production capability
  • competitive pricing
  • fast delivery

Typical Applications of a Piezo Ignitor

  • household appliances
  • gas barbecue grills
  • cigarette lighters

Piezo Ignitor Details

Piezoelectric ignition systems are much simpler, much more compact, and less expensive than alternative systems incorporating permanent magnets or high voltage transformers and capacitors.

The volume of the ceramic element and the amount of stress exerted on the element are key factors in converting mechanical input to electrical energy. The stress on the element is the ratio of the applied force to the surface area of the element. Consequently, when the composition of the ceramic, the volume of the ceramic element, and the applied force are constant, the element that has the smallest surface area will generate the most electrical energy.

In squeeze-type piezoelectric fuel ignitors a static mechanical energy input -- very low frequency, relative to the resonance frequency of the ceramic -- generates the electrical energy for ignition. In the impact ignition design a spring-loaded hammer delivers a dynamic input to the ceramic element. The pressure wave generated when the hammer strikes the element once is reflected multiple times in both the element and the hammer, in accord with the elastic and acoustical properties of the ceramic and the hammer. Until the flashover at the spark gap, stress varies along the height of the ceramic element, and exact values for voltage must be calculated by integration over the height of the element. Approximate values derived from the below equation are usually sufficient for developing simple piezo ignition devices.

Voltage = [g33 x force (N) x thickness of ceramic (m)]

surface area of ceramic (m2)

 

Custom-Designed Piezoelectric Ignitor Elements

APC can design a piezo ignitor element or push button ignitor mechanism for your specific requirements. Please contact an APC representative to discuss your piezo ignitor needs.

Standard PZT Ignitor Elements

APCI Catalog No. Mechanical Input Diameter (mm) Length (mm) Density / ρ (g/cm3) Dielectric Constant / ξ Electric Capacity / C (pF) Coupling Factor / k33 Piezoelectric Voltage Constant / g33 (10-3 V-m/N) Piezoelectric Charge Constant / d33 (pC/N) Curie Point / TC (°C)
60-1035 Impact 5.00 10.00 7.5 880 14±4 ≥ 0.68 31±2 ≥ 260 ≥ 310
60-1085 Impact 7.00 15.00 7.7 2000 50±5 ≥ 0.75 28±2 ≥ 500 ≥ 300
60-1025 Impact 6.27 15.88 7.7 2000 38±2 ≥ 0.75 28±2 ≥ 450 ≥ 300

Static Compressive Strength (kg/cm) > 3000 for all standard ignitor elements.
Operating Temperature < 120 °C for all standard ignitor elements.