What is the difference between ac motor and dc motor?
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. Therefore, all machines that start or demand uniform speed of rotation under heavy load. 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 difference between ac motor and dc motor: 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.
The difference is that the ac is connected by alternating current, while the dc motor is connected to direct current.
We know that the three-phase power supply phase phase difference is the voltage on the phase between 120 degrees, three of the three-phase asynchronous motor stator winding on the spatial orientation also sent 120 degrees, so that when zhongtong into the three-phase power supply in the stator winding, stator windings creates a rotating magnetic field, the stator windings creates a rotating magnetic field, rotor conductors (cage) will cut the lines of magnetic force of a rotating magnetic field and induced current, the current in the rotor conducting bar and interact with a rotating magnetic field to produce electromagnetic force, electromagnetic force produced by electromagnetic torque drive rotor rotating magnetic field along the direction of rotation. In general, the actual speed of the motor is below the rotational speed of the rotating field.
The dc motor is the magnetic field, which is moving in the field. Ac motor is magnetic rotation motion, and conductor motionless. Dc motor are divided into stator winding and rotor winding. The stator winding magnetic field is produced. When general dc. The stator winding is fixed polarity of the magnetic field generated. The rotor flux direct current in the magnetic field force. The rotor in the magnetic field force then spin. Direct current institutions to build complex. Cost is high. Ac motor stator winding and rotor conductors. Shaped like a squirrel cage rotor conductors between conductors and conductors with silicon steel sheet. Also have some ac motor rotor windings. The spinning principle of three-phase asynchronous motor Three-phase asynchronous motor to spin the prerequisite is to have a rotating magnetic field, three-phase asynchronous motor stator winding is used to produce a rotating magnetic field
