Medium and small capacity of asynchronous motor is generally what protection is there?

(1),short circuit protection:general fuse is short circuit protection device;(2),loss of pressure protection:magnetic starter solenoid coil in starting motor control circuit loss of pressure protection.Automatic air switch,auto voltage step-down compensator are generally equipped with a pressure loss tripping device,so that in the above two cases plays a role of overload protection of
motor.(3),overload protection,thermal relay is the motor overload protection device.16,in asynchronous motor operation maintenance work should be paid attention to what?

(1),around the motor motor should be kept clean;(2),with the instrument to check the change of the power supply voltage and the current situation,general motors allow voltage fluctuation for the rated voltage of plus or minus 5%,the difference between the three phase voltage shall not be greater than 5%,the phase single phase asynchronous motor current unbalance value should not exceed 10% And attention should be paid to determine whether the lack of phase operation;(3),regularly check the temperature of the motor,commonly used thermometer temperature,temperature rise shall not exceed the maximum allowed should be paid attention to;(4),listening to the 5kw permanent magnet generator bearings with or without abnormal noise,sealing is good,and regularly to replace lubricating oil,the oil change period,general sliding bearing is 1000 hours,500 hours of rolling bearings.(5),pay attention to the motor sound,smell,vibration and transmission device.During normal operation,the motor should be uniform sound,no www.facebook.com/dongfeng.motor noise and special sound.