Applications of DC Motors
The motor in the shaver is driven by a battery to rotate. Its stator is made of permanent magnets. There are winding coils on the rotor. When the battery is connected, the winding coils will generate a fixed direction. The magnetic field, the magnetic field with a fixed direction interacts with the permanent magnetic field in the stator, and the rotor will turn from one stage of the permanent magnet to the other. At the first level, it will turn back in reverse. This is because the magnetic field generated by the winding coil and the permanent magnet is in a fixed direction. If the winding coil is forward rotating at one level, it must be reversed at the other level. One stage is also rotating forward, so the positive and negative stages of the battery must be exchanged, so there is a commutator (also called a commutator) at the end of the rotor for commutating the winding coil. A motor that works in this way is called a DC motor. The pistol drill is also a DC motor. The difference is that the stator is made of winding coils, and then connected in series with the rotor winding coils. When the AC is connected, its positive half cycle works the same as the shaver motor, and its negative half cycle When working, the magnetic fields of the stator and the rotor are exchanged at the same time, which is also the same as the shaver motor. The permanent magnet in the stator is called a permanent magnet DC motor, and the winding in the stator is called a self (excited) excitation DC motor ( Stator windings are called self-excited windings or self-excited coils). By the way, there are no spark motors. Now there are manyA lot of electrical appliances will generate high heat when they work, such as the CPU in the computer and the power components in the induction cooker, all of which are equipped with axial flow fans for heat dissipation. Ordinary DC motors will generate electric sparks when commutating, and the electric sparks will have a strong interference effect on the working electronic circuits and electronic components, and in severe cases, it can make them unable to work normally. A non-sparking motor that uses Hall elements as a commutator appears. Everyone knows that the three-stage tube can not only play the role of amplification, but also can play the role of switch. The same is true for the Hall element. The difference is that it is not controlled by current (the three-stage tube is controlled by current) or voltage (field effect tube is controlled by voltage), but by magnetic field. This kind of motor makes the winding coil on the stator, the Hall element is fixed at the corresponding commutation position, and the permanent magnet is made on the rotor, and the magnetic field of the rotor acts on the Hall, thereby commutating the current effect.
This type of motor has three major characteristics:
1, the greater the current, the greater the power, and the higher the speed, so if you want to get greater power and higher speed, you must increase its current (as long as the winding can withstand its temperature rise without burning out) Just do it). Now there are many pistol drills that use this feature to adjust the speed.
2. The power supply frequency of the motor has no effect on the power and speed of the motor (irrelevant).
3. The direction of rotation of the motor depends on the polarity of the power supply or the connection method of the winding.
