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.