The reason of bad ventilation cooling overheat the motor

A the environment temperature is too high,the inlet air temperature is high.rotor cutting machine B,inlet have sundry block,make the poor into the wind,wholesalemotor.blogspot.com causing little into the wind C,the motor internal dust too much,the impact of heat dissipation D,fan damage or installed backwards,cause there is no wind or air generator stator volume is small E,not installed wind cover or inside the motor end cover not installed wind deflector,motor without 220v ac electric motors a certain wind path.