With its own advantages of rugged construction, high efficiency, reliable performance and favorable price, 7.5 hp (5.5kW) 3-phase 2-pole induction motor or asynchronous motor can be widely used in various kinds of general purpose machineries like fans, pumps, compressors, machine tools, transportation and so on.
7.5hp Induction Motor Specification
||Horizontal Foot Mounting (B3)
||Output≤4hp (3kW), Y connection
Output≥5.5hp (4kW), Delta connection
|Degree of protection
||TEFC (compliance to IC 411 code of IEC 60034-6)
||7.5hp or 5.5kW
|Nominal Current (full load)
|Power Factor( cosφ)
|Nominal Torque (Tn)
|Locked Rotor Torque/Nominal Torque (TST/Tn)
|Maximum Torque/Nominal Torque (Tmax/Tn)
|Locked Rotor Current/Nominal Current (IST/In)
||Less than 1000m above sea level
Three-phase Induction Motor Dimensions
||Mounting Dimensions (mm)
Wiring Diagrams (Three-phase squirrel-cage induction motor)
Tips: Three-phase induction motor’s starting mode
1. Direct starting
This kind of starting mode is the most basic and simplest in the motor starting. First, the knife switch is used to connect the motor to the power grid and the motor starts to run under the rated voltage, which is characterized by less investment, simple equipment and small quantity. Although the starting time is short, the torque is smaller at starting and the current is large, which is suitable for starting small capacity motors.
2. Reduced-voltage starting
The reduced-voltage starting method can be introduced into medium and large size asynchronous motors to restraint the starting current. When the motor finishes the starting, it will resume to full pressure working. However, the result of reduced-voltage starting will lower down the starting torque. Therefore, the reduced-voltage starting is only suitable for starting the motor under no-load or lightly loaded condition.
3. Soft starting
Soft starter is a new type control device whose main advantages include soft starting, light load and energy saving, and quickness. One of the most important features is that the electronic circuit is conducted in the silicon controlled rectifier of motor under the tandem connection of power supply. When starting in this way, the torque of motor will gradually increase with enhancive speed.