Three Phase Induction Motors Electric Motors

Safe Area Motors (Motors for General Application CGA1/D)

Conformance to Standards
All motors comply with the following Indian and international standards:

Salient features of TEFC Standard Motors:

• BBL motors can be continuously overloaded by 10% or can be used up to ambient temperature of 55°C. Temperature rise will be as per Class F limits
• All motors are with degree of protection IP55
• All motors up to 280M frame are designed for 50°C ambient
• 2Z Bearings are standard up to 180L frame which are filled with high temperature grease suitable up to 140°C
• On line re greasing provided from frame 225 onwards
• SKF or equivalent make bearings are used and directly procured from the bearing manufacturers
• Terminal boxes are large and can be rotated in steps of 90
• Terminal Box location can be changed from RHS to LHS at site
• Rotors are dynamically balanced with half key
• All foot mounted motors are with integral cast feet
• Outer bearing covers are integral with end shield / flange
• V Rings are used in IP55 motors and no reduction in efficiencies as compared to IP44 motors
• Additional anti tracking protective coating of air drying varnish is applied on the winding overhangs
• Cooling fans are of aerodynamic design resulting in low noise and are bi-directional
• Standard Motors are suitable for mounting with any shaft orientation

Performance chart for type MA motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors
• 8 Pole Motors

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Use of these motors can lead to substantial reduction in energy costs. The payback periods are in the order of 3 to 6 months depending upon the usage. Replacing existing motors with High Efficiency IE2 Motors even in power intensive industries gives a payback within 1 to 2 years.

Salient features of Energy Efficient Motors:

• Near uniform efficiency from 50% to 100% of full load
• Insulation class F. Temperature rise limited to 70°C over ambient of 50°C
• Voltage variation: ±10%
• Frequency variation: ±5%
• Combined variation: ± 10%
• Enclosure: IP55

*** -Ratings above 355kW up to 1250kW are available in frame 400 and 450. Please contact our Marketing / Sales Office for more details.

Performance chart for IE2 motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors

Hazardous Area Motors

Hazardous areas are defined as locations where explosive Gas-Air Mixture may occur in dangerous concentrations. IS:5572:2009 & IS:5571:2009 classify the hazardous areas into three zones depending on the frequency and duration for which dangerous concentrations are likely to be present. Classification of these zones and selection of electrical equipment is as under:

Conformance to Standards:

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These motors can be used in Zone 1 and Zone 2 areas as per IS:5572 and IS:15142. Flame proof motors are offered suitable for Gas Gr.I, IIA and IIB only. BBL flame proof motors are certified and approved for use in Zone 21 & Zone 22 ( Presence of combustible and ignitable dust) as per IS : 15142. Motors are also offered in multi speed and non standard outputs / voltages / frequencies.

Salient features of TEFC Standard Motors:

Type of constructions:

• Standard Motors are designed for foot mounting (B3). These are also suitable for B6, B7, B8, V5and V6 mounting without any change.
• Motors can be supplied in flange mounting (B5). These motors will also be suitable for V1 and V3 mounting without any change.
• The flame proof motors manufactured by BBL are suitable for Temperature Class T1 to T4 as per IS 6381.

Main Characteristics:

• Sturdy housing which prevents an internal explosion from spreading to the outside and resists the explosion pressure
• Robust bearing shields and caps bolted to the frame in such a manner that the gaps remain unaffected in the event of an internal explosion
• Screen on air intake with a mesh size not exceeding 8 mm
• External earth terminals
• Protective earth conductor terminal in the terminal box
• "Ex 'd'" mark on the motor
• CIMFR certificate No., PESO and DGFASLI certificate No. and ISI Licence mark on the name plate
• Special varnishing and painting treatment to resist highly corrosive atmosphere

Enclosure Design:

• The frame, end shields, terminal boxes and bearing covers of all motors are made of grey cast iron. The motors are so designed that the frame temperature will remain below the ignition temperature of the gas-air mixture

Insulation:

• All motors of standard design are provided with Class F insulation with temperature rise limited to Class`B'
• All motors of standard design are provided with Class F insulation with temperature rise limited to Class`B'

Cooling:

• All motors have bi-directional cast iron or fabricated fans

Terminal Box:

• Flame Proof Motors have terminal box on the top as standard. Side terminal box can be offered on request for frame sizes 132M and above

Cable Entries :

• Motors for Coal mining application (Gas Group I ) are provided with cable entries with compound filling sealing boxes suitable for paper insulated lead covered double wired armoured (PILCDWA) PVC cables. Cable entries with flameproof cable glands can also be provided to suit PVC armoured cables. (For application in hazardous area Gas groups IIA and IIB only). Motors in all frame sizes can be supplied with termination suitable for plug and socket arrangement, against enquiry A cable sealing box is mandatory for all motors for use for Gas Group I (Coal Mines) and Gas Group II A & II B(Oil Mines)

Performance chart for type MD Flame Proof Motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors
• 8 Pole Motors

Performance chart for type MJ Flame Proof Motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors
• 8 Pole Motors

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Salient features of TEFC Standard Motors:

Terminals and Connection:

• External connections of client's power cable to the motor terminals in terminal box must be rigidly gripped and secured against loosening and twisting. This is achieved with the help of a specially designed Terminal Plate provided in the Terminal Box.

Terminal Box:

• The motors in frame size 63 to 80, 180, 250 to -355 are provided with terminal box on top. Side T Box can be provided on request in frame sizes 180 and above. The terminal box for frame size 90S to 160L is fitted on the right hand side, seen from the driving end. Terminal box on left-hand side can also be provided in frame size 90S to 160Lon request. An earthing terminal is provided in the Terminal Box.
• Terminal Boxes in frame sizes 63 to 355L can be rotated through 360° in steps to 90° to suit the cable location.

Air-gap:

• Radial air-gap of the motors is such that the minimum air gap values specified in IS: 6381 are fully satisfied

Enclosure:

• AIncreased Safety Motors have a degree of protection IP55 in accordance with IS: 4691 as a standard feature. In addition, all flange motors (B5 and B14) have Oil Tight Shaft (OTS) protection.
• Motors with V1, V5 and V18 mountings are provided with a canopy fitted on the top of the fan cowl

Winding and Rotor Cage:

• The stator winding and rotor cage are so designed that the limiting temperature specified in IS: 6381 are not exceeded even at the end of time tE.

Name Plate:

• Stainless steel name plate is provided with each motor. Over and above the normal name plate details, other data such as time tE, starting current, temperature-Class, type of protection, approval certification etc. are also provided.

Paint:

• Acid Alkali Proof epoxy paint is provided on all motors.

Certification:

• ME motors are approved by PESO, Nagpur. A declaration to this effect is incorporated on the name plate.

Performance chart for type ME Increased Safety Motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors
• 8 Pole Motors

Performance chart for type MI Increased Safety Motors:

• 2 Pole Motors
• 4 Pole Motors
• 6 Pole Motors
• 8 Pole Motors

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Motors are also offered in multi speed and non standard outputs / voltages / frequencies. These motors can be used in Zone 2 areas as per IS 5572/ IEC60079-15 : 2005.

Salient features of Energy Efficient Motors:

• Ex 'n' Motors, provides protection against auto-ignition of surrounding gases/ vapours. These motors conform to IS: 8289 and IS: 9628 and can be used in zone 2 areas.
• The surface temperature does not exceed 200°C i.e. Temperature class T3
• The Terminal Box has degree of protection IP55
• A drain plug is provided on the end shields to remove condensed water
• The terminal plate is of a special design such that the terminals are protected against loosening under vibrations
• The radial air gap of the motors is such that the minimum air gap values specified in IS: 6381 are fully satisfied

Performance chart for Non Sparking Motors:

• Type MN
• Type MS

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Crane Duty and Brake Motors

BBL manufactures Squirrel Cage Crane and Hoist Duty Motors with Type 'MC'. These motors are generally one frame size smaller than normal. These motors are not limited to cranes and hoists, but can also be used in applications requiring frequent switching.

Standard 'MC' motors are designed for use for S3, S4 or S5 duty with various Cyclic Duration Factors (CDF). These motors can be offered in various types of mountings and are made with standard 'MA' components. i.e. body, end shields etc.

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BBL manufactures TEFC crane duty three phase Slip ring motors with Type 'MP'. These motors are used for cranes requiring frequent start /stops and for speed control. Standard 'MP' motors are designed for use for S3, S4 or S5 duty with various cyclic duration factors. These motors can be offered in various types of mounting.

Performance chart for Slip Ring Motors:

• 2 Pole Motors
• 4 Pole Motors

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BBL manufactures TEFC three phase DC Brake Motors with Type 'MB'. These motors are used for applications requiring positive and instantaneous braking. These motors are 'fail safe', which means that the brake will be applied immediately in case the power supply fails or is switched off.

These motors have a built in rectifier along with a varistor for protecting the rectifier as well as the brake coil from voltage surges. The special brake liner used assures consistent braking torque with minimum wear. This leads to almost maintenance free operation. These motors can be offered in various types of mounting. BBL manufactures these motors in frame sizes from 71 to 132M in 2, 4, 6 and 8 pole.

Multi speed brake motors can also be supplied. Motors from 90S to 132M can also be supplied with a manual release arrangement to manually release the brake.