Who knows the main difference between dc motor and ac motor
The biggest difference is that the power supply is different: one is the dc power source and one is the ac power supply. Ac motors, with 220 volts or 380 volts alternating current. Household appliances such as fans and washing machines are used for ac motors. Dc motor, which USES a 24 volt or 12 volt dc power supply, which requires a stabilized power supply or a battery for alternating current. Commonly used in computer cooling fan, etc.
As the name suggests, dc motors use direct current as a power source. Ac motor is used as an ac power supply. According to the structure, the principle of dc motor is relatively simple, but the structure is complex and not easy to maintain. Ac motor is complex but relatively simple, and is easier to maintain than dc motor. The dc motor introduces the current to the rotor armature through the brush and the commutator, so that the rotor can force the force in the stator field. Ac motor (commonly used ac asynchronous motor, for example) is to put the ac electric flux into the stator winding, thus in the rotor creates a rotating magnetic field in air gap, rotating magnetic field in the rotor winding induced current, which make the rotor spinning force produced in the stator magnetic field. Dc motor speed regulation is simple, but use case is limited. Ac motor speed regulation is relatively complicated, but it is widely used because of ac power supply.
External power supply is different, one is direct current, one is alternating current. The dc feature: (1) the speed of regulation is good. The so-called "speed regulating performance" means that the motor changes the speed of the motor under certain load conditions. Direct current electromotor can achieve uniform, smooth stepless speed adjustment under heavy load conditions, and the speed adjustment is wider. The starting torque is large. The speed adjustment can be achieved evenly and economically. As a result, people who are under the heavy load starting or require uniform adjusting the rotational speed of machinery, such as large reversible rolling mill, hoist, electric locomotive, trams, etc., all with dc dc motor motor drive. Communication features: The ac motor is more efficient, no smoke, no smell, no pollution and less noise. Due to its series of advantages, it is widely used in industrial and agricultural production, transportation, national defense, commercial and household electrical appliances, medical equipment and so on.
The reason that the stator magnetic field is rotated is the three-phase symmetric alternating current, which is 120 degrees behind each other, and the stator field rotation is the change of alternating current. By changing the speed of alternating current changes, the speed of the motor can be changed. Dc power supply, 2) dc motor is the same constant voltage, and the coil connected to the actual location change of formation, and connected to the coil of the actual location of the change only associated with the speed of the rotor rotation; As long as the rotor's speed is changed, the rotor's speed is proportional to the voltage, and the change of voltage can change the speed, which is the speed adjustment.
The two point poles 1 and 2 dc motors are forever 1 is positive and 2 is negative and the ac motor is a very shallow sign of positive and negative points
