The difference between induction motor and ordinary motor
A single-phase asynchronous motor is a motor that requires only a single-phase AC power supply, and is composed of a stator, a rotor, a bearing, a casing, and an end cover. The stator consists of a base and a core with windings.
Motor stall:
The torque of the motor running at rated power is called the rated torque. At this time, the speed is the rated speed. Due to the external characteristics of the motor (also known as the output characteristic and the torque characteristic), the speed (n) of the motor is changed with the load on the shaft. TL load torque) changes (TM-TL = algebraic formula with n), as the load increases to a certain degree, the speed will drop sharply. When the load on the shaft causes the motor speed to drop to 0, it is said to be blocked. The torque is the stall torque in units of kg. m, is the physical quantity that measures the ultimate output capability of a motor.
When the motor is blocked, the power factor is extremely low. When the motor is blocked, the current (called the blocking current) can reach 7 times of the rated current. If the time is long, the motor will be burned out. Therefore, the general test of the motor includes the stall test.
Generally, the motor has an overheat protection function. After the motor is blocked, the current increases rapidly, resulting in a large amount of heat. After a certain degree of heat, the motor is automatically disconnected. In the protection mode, the motor will not work until the heat is dissipated. To resume work, to avoid this situation often occurs, generally need an electronic control unit to measure the working current of the motor. Once the current exceeds the normal value, the power supply is cut off immediately, and the buzzer alarms.
Ironless motor vs. iron core motor, brushed vs. brushless and ironless core. Only the plastic film is sealed. The copper coil rotor has a permanent magnet with a core. The rotor has a core or its core has no iron. The power of the core motor is smaller than that of the toy car. The motor design mode has a larger core and a larger output.
The brushless motor is generally a three-phase asynchronous motor that belongs to the brushless AC synchronous motor. It belongs to the brush motor electric tool motor (electric drill cutting machine, etc.). Most of them have brush motor brushless motor speed, simple control, brush motor speed. Good control
