Type:Polypropylene Film Capacitor
Operating Temperature:40/70/21, 40/85/21
Application of Capacitor:AC Motor
Application:AC / Motor
A variable capacitor is a capacitor whose capacitance can be adjusted within a certain range. When the relative effective area between the pole pieces or the distance between the pieces is changed, its capacitance changes accordingly. Usually used as a tuning capacitor in a radio receiving circuit.
1. Rectangle flame retardant plastic case, epoxy resin sealed;
2. Small size ,light weight ,convenient for installation;
3. Low dissipation factor, high insulation resistance;
4. Self-healing property, high stability and reliability;
5. Suitable for electric fan, exhaust fan, electric sewing machine, water pump etc., beneficial to the starting and running of AC motor.
Used as tuning capacitor in radio receiving circuit
Generally consists of two sets of pole pieces insulated from each other: a fixed set of pole pieces is called a fixed piece, and a movable set of pole pieces is called a moving piece. The moving blades of several variable capacitors can be combined on the same shaft to form a coaxial variable capacitor (commonly known as double, triple, etc.). Variable capacitors have a long handle, which can be adjusted by pulling wires or dials. The shape is as follows: Variable capacitors are capacitors whose capacitance can be adjusted within a certain range. They are usually used as tuning capacitors in radio receiving circuits.
Variable capacitors can be divided into air dielectric variable capacitors and solid dielectric variable capacitors according to the dielectric materials used.
1. Air dielectric variable capacitor
The electrode of the air dielectric variable capacitor is composed of two sets of metal sheets. The fixed one of the two groups of electrodes is a fixed piece, and the rotatable one is a moving piece. Air is used as a medium between the moving piece and the fixed piece.
When the moving piece of the air-dielectric variable capacitor is rotated so that all the moving pieces are screwed into the fixed piece, the capacitance is the largest; otherwise, when the moving piece is completely rotated out of the fixed piece, the capacitance is the smallest.
Air medium variable capacitors are divided into air single-link variable capacitors (referred to as air single-link) and air double-link variable capacitors (referred to as air double-link, which are composed of two sets of moving and fixed blades, which can rotate coaxially and synchronously). Air dielectric variable capacitors are generally used in radios, electronic instruments, high-frequency signal generators, communication equipment and related electronic equipment.
2. Solid dielectric variable capacitor
The solid dielectric variable capacitor is a mica sheet or a plastic (polystyrene and other materials) film as a medium between the moving piece and the fixed piece (the moving piece and the fixed piece are irregular semi-circular metal pieces). The shell is transparent plastic. Its advantages are small size and light weight; its disadvantages are large noise and easy to wear.
Solid dielectric variable capacitors are divided into sealed single-connected variable capacitors (referred to as sealed single-connected), sealed double-connected variable capacitors (referred to as sealed double-connected, it has two sets of moving, fixed and dielectric, which can rotate coaxially and synchronously) And sealed four-connected variable capacitor (referred to as sealed four-connected, it has four moving and fixed pieces and dielectric).
Sealed single-link variable capacitors are mainly used in simple radios or electronic instruments; sealed double-link variable capacitors are used in transistor radios and related electronic instruments and electronic equipment; sealed four-link variable capacitors are commonly used in AM / FM multi-band radios .
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