Project Information
Overview
Crane and Hoist duty motors from Bharat Bijlee are ideal for frequent starts/stops and reversing. They are also used for applications such as material handling, weirs and sluices, lifts of all types and auxiliary motors in rolling-mills or wherever intermittent drives are required. They conform to IS : 325 for Three-phase Induction Motors and IS 4722 for Rotating Electrical Machines. The size of the motor is governed by the mechanical effects of starting and braking functions, the type of control and the number of switching’s per hour. The rated output, the number of starts/hour and the inertia (i.e. load GD2 + rotor GD2) are interdependent.
BBL Crane Duty Motor Brochure
Technical Specification
Features
Technical Specification
- Frames : 71 to 225
- Mounting : B3 Construction
- Insulation : class ‘F’ insulation suitable 415 V ± 10%
- Frequency : 50 Hz ± 5%
- Ambient temperature: 45°C
- Degree of Protection: IP 55
- All motors Conform to IS 325
- All motors are suitable for Inverter Duty applications
Features
Salient Features are as follows:
- Very high no. of switching: These motors are suitable for very high no. of switching ie. 900 starts/stop per hour which includes inching and plugging
- Special winding & impregnation: The stators are wound with Dual Coated(DC) winding wires as per IS 13730 part 13 and winding is impregnated with VPI process. This improves the thermal withstand capacity of the motor
- Robust construction: Shaft material is given special heat treatment to withstand high intermittent load. These motors have special squirrel cage die cast rotors which ensure minimum maintenance and trouble free operation
- Forced cooling: This ensures continuous cooling of the motor
- Built in thermal protection : Built in thermal protection is provided by embedding thermostats in the winding. This ensures protection of the motor against failure due to excessive heating caused by severe starting duty, single phasing, overloading, low voltage etc.
- Compact design : Compact in size as the auxiliary fan motor used for forced cooling is an integral part of the main motor