If a solenoid is controlled by a transistor which is signaled from a microprocessor, the PWM can be considered as an alternate means for reducing sizes or saving energy. PWM reduces the effective voltage by pulsing the voltage input. For example, if a solenoid has 12 volts supplied, but at 500 Hz at a 50%
When energized, the push rod extends, pushing the load. A push solenoid is actually a pull solenoid with the addition of a push rod that rides against the internal face of the plunger extending through the fixed-pole piece.
An intermittent duty unit with extremely short ON time. A duty cycle is normally in the 10% to 25% range. This is maximum input power for that size solenoid.
When energized, the plunger retracts, pulling the load. De-energized, the plunger is extended to specified stroke distance.
A common option for extended environmental protection is a potted or encapsulated coil. Potting or over-molding helps in making the coil humidity/splash resistant (in applications where this is common). If more severe conditions exist, further sealing of the coil cavity may be required.
The pole or stop is stationary component within the solenoid that attracts the moving armature when the coil is energized.
Having two oppositely charged poles, one positive and one negative. Polarity determines the direction in which current tends to flow.
The magnetic moving component of a linear solenoid.
The ratio of the flux through any given cross section of a given medium (bounded by equipotential surfaces) to the difference in magnetomotive force between the two surfaces.
The ratio of flux density in a given medium to the magnetic field intensity.