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electric ac motor for crane and metallurgical uses, featured with large overload capacity and adequate mechanical strength, is specially suitable for driving various types of crane and metallurgical machine or other similar equipment.
YZR series electric ac motor is of wound rotor slip ring type, while YZ series electric ac motor is of squirrel cage type.
These series of metallurgical and crane 3-phase motor YZR with wound and squirrel cage rotor are specially used to drive metallurgical crane and other similar machines with better overload capability and mechanical strength, therefore, it is suitable for short time duty or intermittent period duty and equipments with frequent starting and braking or distinct vitration and impact.
The power grade and the installation dimensions of the motor are in accordance with the recommended standard of IEC 72; the correlation between the power grade and the installation dimensions is similar with Japan JEM1202 and Germany DIN42681, most of which can be exchanged. YZR series wound rotor three-phase asynchronous motor for metallurgy and lifting is in accordance with the specification of professional standard JB/T10105-1999 and YZ series squirrel-cage rotor three-phase asynchronous motor for metallurgy and lifting is in accordance with the professional standard.
The motor can work well when the altitude does not exceed 1000m.
There are two classes of F and H insulation, Class F is applicalbe to suit temperature which cool air does not exceed 40 under normal condition, Class H is suitable for metallurgical sites when ambient temperature no exceeding 60 both motors have same data.
The motors possess better enclosure, degree of protection IP44 for normal site condition, and IP54 for metallurgical condition.
Motor's rated voltage and frequency is 380V, 50HZ.
There are seven types of duty type for these series motors, S2, S3, S4, S5, S6, S7, S8 and S9. The basic duty type is S340% (duty type is S3, cyclic duration factor is 40%, each cyclic is 10min). The following duty types are most useful to these series motors.
1. Short-time duty type (S2)
Operation of constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to re-establish machine temperature within 2 deg K of the coolant.
2. Intermittent periodic duty type (S3)
A sequence of identical duty cycles, each including a period of operation at constant load and a rest and de-energized period but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium In this duty type, the cycle is such that the starting current does not significantly affect the temperature rise.
3. Intermittent periodic duty type with starting (S4)
A sequence of identical duty cycles, each including a significant period of starting, a period of operation of constant load and a rest and de-energized period, but the operation period is so short that it is not sufficient for the machine to reach thermal equilibrium.
4. Intermittent periodic duty type with electric braking (S5)
A sequence of identical duty cycles, each consisting of a period of starting, a period of operation at constant load and a rest and de-energized period, but the operation period is so short that it is not sufficient for the machine to reach thermal equilibrium.
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