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Inner Structure of Vacuum Capacitors
Vacuum capacitors offer high-performance characteristics due to the electrode parts for storing electric charges allocated inside the ceramic vacuum container. The ceramic chassis resistant to heat generated while the rated current is carried and the vacuum structure with high insulating performance have established the compact, high-voltage, and high-current vacuum capacitors with high reliability. The loss coefficient is kept very small because the vacuum is the dielectric of the capacitor, the chassis is made of high-insulating and low-loss ceramics, and low-loss electrode materials are used. Vacuum variable capacitors are designed to enable the capacitance to change by the vertical sliding motion of the moving electrode assembly located inside the vacuum container. On the other hand, the structure of vacuum fixed capacitors does not allow the capacitance to change because the electrodes in the container are fixed.
VH Type
(1) Double bellows
- Assuring low torque and high current (the same torque for H65 to H110) by functionally separating the stainless bellows for vacuum sealing and large aperture/copper alloy bellows for current carrying
(2) Low-loss Ceramic envelope and no center pin
- Assuring low loss
(3) Low-wear/high-intensity screw and double guide bearing
- Assuring low torque and long life
(4) Standardized guide bearing mounted
- Reducing the lateral load to the capacitance adjustment screw in the case of central misalignment with a motor
VM Type
(1) Low-loss/high-strength bellows
- Securing a balance between mechanical intensity and current capacity by plating the stainless bellows with copper
(2) High-strength special screw
- Assuring a long life of stainless nut and bolt by the use of fluorinated grease
- Securing 12 tuner turns by the double-thread screw
(3) Sliding under the vacuum
- Realizing the miniaturization by placing the sliding part in the vacuum
(4) Peripheral tank used also as the electrode
- Realizing the miniaturization by using the tank as an electrode
