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How does a Hair Dryer Work?
time2021/06/23
- How does a Hair Dryer Work?
Like most home appliances, the hair dryer runs on a motor.
A motor driven by electricity spins the fan.This mechanism allows room temperature air to be drawn through the vents of the hair dryer and then blown through the heating coil.The air is heated and forced from the head of the hair dryer into the hair.
The hot air emitted from a hair dryer increases the temperature of the air surrounding each strand of hair. Since warm air can contain more moisture than air at room temperature, more water can move from your hair into the air. The increase in temperature also makes it easier for the individual molecules in a water droplet to overcome their attraction to one another and move from a liquid to
a gas state.
What about the internal structure？
This is a filter cage, it should be user detachable, it should be washable.Air enters the motor through holes in the mesh filter.
By removing some of the screws that hold the strainer in place, you can clearly find the components of the handle.
The heat and fan speed control buttons are coated with a thin layer of silicone rubber to provide springback for these buttons.
There are two power module chips on the board. They are the Infineon IRSM808-204MH Half-Bridge Module, designed for home appliance motor drive applications, such as energy-saving fans.
The microprocessor responsible for "intelligent thermal control" is Microchip PIC16F1939-I/mV MCU.
The black cylinder welded to the circuit board by black and white wires is an anion (negative ion) generator.The anions combine with positively charged particles such as dust to purify the air.This component is often found in indoor fans.Many manufacturers of fancy hair dryers claim to use "ion" technology, which reduces static electricity and makes hair less frizzy, but the effect is temporary and lasts as long as the dryer is turned on.Interestingly, Dyson did not explicitly refer to its hair dryers as having "ion" technology, using only standard electronic components as a key word.
The motor is enclosed by a sleeve similar to the silicone rubber sleeve to reduce vibration of the handle.The impeller mounted on the motor shaft is machined by a five-axis milling machine.This is probably one of the most expensive parts of the entire assembly.By contrast, the impellers found in Dyson vacuums are molded with fiberglass.
Heating element
The physical components of the hairdryer that help to get rid of water from your hair are the electric fan and the heating component. Both of which are located inside the hairdryer. Room temperature air comes into the hairdryer through the vents. The air then passes a nichrome wire which is used as the heating element. Nichrome is an alloy that is combined with both nickel and chromium. The nichrome wire acts as a resistor of the electric energy, which in turn creates the heat that the room temperature air passes through to become hot enough to get the moisture out of your hair. The hot air is then blown out the end of the barrel and onto your hair.
Principle
Since its starting torque is zero, a rotating magnetic field must be generated inside it to turn the motor. In general, a starting winding must be placed along with the working winding. The two windings must be spaced at an Angle in space in the motor.This creates a rotating magnetic field by introducing different phases of current into the motor to turn it around.Generally with capacitance or resistance phase start.According to the principle of electromagnetic induction to work.Current-carrying conductors are subjected to a force in a magnetic field while moving coils are made of enameled wire with a copper or aluminum core.When symmetrical current is passed into the stator coil, a rotating magnetic field is generated. The rotor conductor cuts the rotating magnetic field and generates an induced electric potential. Under the action of the electric potential, the rotor conductor flows through the current. The rotor current interacts with the rotating magnetic field so that the rotor is driven to rotate by the electromagnetic torque generated by the electromagnetic force.