Meaning of basic technical parameters of Y-series motors
1. Standard number JB/T9616-1996
2. Type of outer casing protection structure
The Y-series small three-phase asynchronous motors have two basic enclosure protection ratings: IP23 and IP44. The meanings of IP23 and IP44 are as follows: IP – a symbol indicating the protection rating. The requirements for the last two digits are as follows: IP23: The first digit protects against finger contact and contact with live or rotating parts inside the enclosure, and prevents the entry of small solid foreign objects larger than 12mm in diameter. The second digit should have no harmful effect on the motor from water splashed at or less than 60 degrees to the vertical. IP44: The first digit protects against contact with tools, metal wires, or similar objects thicker than 1mm from live or rotating parts inside the enclosure, and prevents the entry of small solid foreign objects larger than 1mm in diameter, excluding vents from external fans and drain holes in enclosed motors; these parts should have Level 2 protection. The second digit should have no harmful effect on the motor from water splashed from any direction.
3. Installation structure and type
The mounting structures of Y-series motors are divided into three types: foot mounting, mounting with a foot and flange end cover, and mounting with a single flange end cover. Based on these three basic mounting structures, the motor mounting types are further divided into horizontal mounting or vertical mounting, and shaft extension upward or downward, namely mounting methods such as B3, B35, B5, V1, and V15. For specific models, please refer to the standard.
4. Cooling method
Y-series motors are primarily cooled by circulating ambient air.
The IP23 motor uses the fan blades on the rotor end ring as the driving element. The surrounding cold air enters from the end cover, is pressurized by the fan blades, carries some of the rotor heat, and then cools the stator winding ends and the back of the iron core. The heated air is discharged from the middle of the casing.
In an IP44 motor, all the heat generated by internal losses (iron losses, copper losses, and mechanical losses) during operation is transferred to the motor surface. A fan installed at the non-shaft extension end drives the surrounding air to continuously blow on the motor surface, carrying away the heat and achieving the purpose of cooling the motor.
5. Refer to the table for power rating and installation dimensions.
6. Main performance indicators: Compared with other manufacturers, some motors may have shorter iron cores and thinner enameled wires, but all performance indicators such as motor power meet the standard requirements.
7. Winding Temperature Rise: Y-series motors use Class B insulation, allowing a winding temperature rise of 80K. Class F insulation allows a winding temperature rise of 115K. 8. Operating Conditions: (1) Altitude is not allowed to exceed 1000 meters, ambient temperature is not more than 40℃ and not more than -15℃. The average maximum humidity of the wettest month at the operating location is 90%, and the average minimum temperature of that month is not higher than 25℃. (2) Power supply voltage is 380V±5%, frequency is 50HZ with a variation not exceeding ±1%, and the three-phase current imbalance is not more than 10% under no-load and not more than 5% under medium load. The no-load current is generally 30-55% of the load current.
