Construction:

Brake Motors are used for various applications where instantaneous stopping of the driven load is required. The operation of the brake is “FAIL SAFE TYPE” i.e. normally ON. When the electrical power to the motor is cut–off or the power fails, the brake is applied.

Brake motor is a combination of an A.C. induction motor and an electromagnetic AC or DC brake. The electromagnetic brake is mounted on the non–driving end of the motor.

DC brake motors are provided with a rectifier which provides the required DC voltage to the brake coil which in turn operates the brake. The supply to the rectifier is fed from any two terminals (between any two phases) in the main terminal box of the motor.

General applications of Brake motors are printing machinery, textile machinery, rolling mills, cranes & hoists, material handling equipments, machine tools etc.

Working:

When the power to the motor is switched off, a braking torque is generated which presses the armature plate of the brake against the mounting flange. When the supply resumes, a magnetic field is produced in the brake coil and this pulls the armature plate against the spring force and the shaft is now free to rotate.

Range of Hindustan Brand Brake Motors:

KW                             : 0.18 to 55.0 kW

Pole                            : 2P, 4P, 6P & 8P

Mounting                    : B3, B5, B14 & combinations

Frame                        : 63 to 250MX

Motor Voltage            : 415V±10% or as required

Frequency                  : 50Hz±5% or as required

Braking torque           : Up to 800Nm

Brake coil voltage       : 190V DC (Other voltages on request)

Protection                   : IP54

Duty cycle                   : S1 – S8

SPECIAL FEATURES:

• The brake motors are simple & rugged & so easy for maintenance.
• No separate DC supply is required as the rectifier is provided which gives the required DC voltage for energisation of the brake.
• The rectifier is mounted inside the main terminal box so no separate terminal box required.

General guidelines for selection of suitable Brake Model:

The Brakes are rated by torque & selection of suitable model can be made by calculating the required torque, rating of the brake & then matching it with static torque.

Torque (Nm) = 9550 x (KW / RPM) x Safety Factor (SF)

where kW-Kilowatts of motor,

RPM-Speed of motor,

SF-Safety Factor depending on type of prime mover & load.

For electric motor, SF = 2 to 3

For diesel engine, SF = 4 to 5

For compressor, SF = 5 to 6.

INTRODUCTION

Cooling tower motors are specially designed flange mounted motors in totally enclosed construction to suit air conditioning & refrigeration industries. They are provided with special long shaft construction with external threaded end to directly mount the fan blades. This also helps in the better cooling of the motor. Motors are compact in design & less in weight to facilitate easy maintenance. They are available as standard catalogue designs or as custom built.

RANGE

 

Power            : 0.37 to 37.0 kW

Polarity          : 4P, 6P, 8P, 10P & 12P

Mounting       : B5 flange mounted

Frame size    : 71 to 315

Voltage          : 415V ± 10% or as required

Frequency     : 50Hz ± 5% or as required

Ambient         : 45°C.

Altitude          : up to 1000m above msl

Enclosure      : Totally Enclosed Non Ventilated (TENV) / TEFC

Protection      : IP55

Ins. class       : Class F with temp. rise limited to class B.

Duty               : S1

INTRODUCTION:

Crane duty motors are specially designed for frequent starts/stops & reversing required in cranes & lifts of all types. They can also be used in applications such as material handling, weirs & sluices, auxiliary motors in rolling mills or wherever intermittent drives are required.

Range:

KW                       : 0.18 to 200.0 kW

Pole                     : 4P, 6P & 8P

Mounting              : B3, B5, B14 & combinations

Frame                  : 71 to 315LX

Voltage                : 415V ± 10% or as required

Frequency            : 50Hz ± 5% or as required

Ambient               : 50°C. (Refer Table 1)

Altitude                : up to 1000m above msl (Refer Table 2)

Rotor type            : Squirrel cage aluminium die cast

Enclosure             : Totally enclosed fan cooled (TEFC)

Protection            : IP55

Ins. class              : Class F with temp. rise limited to class B

Duty cycle            : S3, S4 & S5

Standards            : IS/IEC 60034-1, IS 325, IS 1231, IS 2223 & IS 4722

Table 1			Table 2
Ambient temp.   (°C)	Deration factor   for Power		Altitude above   msl (m)	Deration factor   for Power
50°C	1.00		1000	1.00
55°C	0.96		1500	0.97
60°C	0.92		2000	0.94
			2500	0.90
			3000	0.86

 

Construction:

Castings: Crane duty motors’ housings & end shields are made from high quality castings as per IS 210. All components are machined to correct accuracy & alignment.

Stampings: The stampings are made from low loss high permeability steel.

Terminal Box:  Standard location of terminal box is on top. However the terminal box on right or left side can be provided on request. The terminal box can be rotated in steps of 90° in each position. Motors up to 250 frames have aluminium boxes whereas frames 280 & 315 are with cast iron terminal boxes as standard. Cast iron terminal boxes up to frames 250 can also be provided on request.

Winding & Protection: All motors are wound with super enameled dual coat copper wires. This enable motors to be used for inverter applications as well. Features like vacuum pressure impregnation (VPI) & PTC thermisters embedded in stator winding can be provided on request.

Earthing terminals: Two earthing terminals are provided, one in the terminal box & other on the motor body.

Anti-condensation Heater: To avoid moisture accumulation inside the motor, the motor windings can be heated by connecting 4-10% of rated voltage to the motor terminals. This will generate enough heat equivalent to 20-25% of rated current. Alternatively any method as described in IS: 900 can be used. Motor can also be offered with space heaters on request for frames 90 & above.

Motors with integral brakes:

These motors can be supplied with integral electromagnetic DC fail safe brakes with built in rectifiers for frames up to frames 250MX.

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Flameproof motors:   “Hindustan” crane duty motors are also available with flameproof enclosures. Enquiry Details: When placing an enquiry, please furnish the following details; ·      Application details ·      Motor power & speed ·      Voltage & frequency variations ·      Mounting ·      No. of start/stops per hour with duty & CDF ·      Load GD² at motor speed ·      Load torque or torque/speed curve of driven equipment ·      Duty cycle diagram if other than those described herein

Specifications:

• Frames: 63 to 315L
• Rating: 0.18 to 200.0 kW
• Poles: 2, 4, 6 & 8
• Mountings: B3, B5, B14 & combinations
• Protection: IP55
• Enclosure: TEFC

Specifications:

Frames : 56 to 355L
Rating : 0.093 to 315.0 kW
Poles : 2, 4, 6 & 8
Mountings : B3, B5, B14 & combinations
Protection: IP55
Enclosure : TEFC

Specifiations:

• Frames: 90 to 355L
• Rating: 0.37 to 315.0 kW
• Poles: 2, 4, 6 & 8
• Mountings: B3, B5, B14 & combinations
• Protection: IP55
• Enclosure: Totally enclosed force cooled with 3ph fan motor

Specifications:

• Frames: 71 to 315L
• Rating: 0.12 to 120.0 kW
• Poles: 4/2, 8/4, 6/4, 8/6 & others
• Mountings: B3, B5, B14 & combinations
• Protection: IP55
• Enclosure: TEFC

Specifications:

• Frames: 71 to 355L
• Rating: 0.12 to 150.0 kW
• Poles: 4/2, 8/4, 6/4, 8/6 & others
• Mountings: B3, B5, B14 & combinations
• Protection: IP55
• Enclosure: TEFC

Specifications:

• Frames: 112M to 160L
• Rating: 0.75 to 7.5 kW
• Poles: 4, 6 & 8
• Mountings: B5
• Protection: IP55
• Enclosure: TENV, TEFC

Specifications:

• Dual Voltage / Dual Frequency motors
• Low Vibration motors for machine tools
• Motors for Extreme Climatic Conditions
• Motor for Import Substitute

Specifications:

• Frames: 100 to 180L
• Rating: 0.55 to 15.0 kW
• Poles: 4, 6 & 8
• Mountings: B3, B5, B14, Pad & combinations
• Protection: IP55
• Enclosure: TENV, TEFC with clean flow
• Applications: Ring, Loom, Carding, Ginning &  Spinning

Specifications:

• Frames: 63 to 160L
• Rating: 0.037 to 5.5 kW
• Poles: 4, 6 & 8
• Mountings: B3, B5, B14 or special
• Protection: IP55
• Enclosure: Totally enclosed or force cooled
• Torque: 0.048 to 3.57 kg.m