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This series of motors are closed self fan cooled squirrel cage three-phase asynchronous motors. It has extremely high starting torque and good low-frequency operation characteristics. It is especially suitable for occasions with impact load. In this case, it is more energy-saving than ordinary motors. This series of motor is the main motor for water jet loom. It has no junction box and adopts outlet board. It can also be used in occasions similar to the above situation. Delta connection is adopted when the motor is started and Y connection is adopted during operation.