Speed of Torque Motor drops as it is loaded and reaches to zero as seen from the graph. After reaching zero speed if the shaft of Torque Motor is rotated by force in opposite direction of normal rotation then the Torque Motor tries to resist it. (Please see graph below X-axis, which shows T/ N curves at different voltages)

This typical property of Torque Motor is used in unwinding application like cable reeling drums.
Motorised Cable Reeling Drums (C.R.D.) are used to supply electrical power to moving equipment like Stackers, Reclaimers, Trippers etc. in Steel Plants, Cement Plants, Power Stations, Ports/Docks etc.

CRDs are driven by Stall Torque Motors through Gear-Boxes of required ratios. CRDs are rotating in both directions depending upon application ( i.e. whether cable is paid-off or is reeled in).

Mark Elektriks manufactures Torque Motors since 1971 for various applications. Mark Elektriks has been supplying stall Torque motor for CRDs since 1984-85 in Squirrel Cage type design and since 1995 in Slip Ring Type design.

MARK make Stall Torque Motor, No Load Speed 450 RPM (12 Pole), 3 Phase, 50 Hz, 415 Volts, Foot Mounted (B-3 Construction), Class ‘F’ Insulation, suitable for 50°C ambient; Cont.rated, fitted with ‘EMCO’ make A.C. failsafe Electromagnetic Brake, Totally Enclosed Surface Cooled (TESC) Enclosure. (Brake Coil Voltage will be 415 Volts). Protection IP-54. Tolerance for stall torque + 10 % to - 5%.

MARK’ make Stall Torque Motor (Slipring Type) No Load speed 1500 RPM (4 Pole), 3 Phase, 50 Hz, 415 Volts. Foot Mounting ( B3 Construction) Class ‘F’ insulation, suitable for 50°C ambient. Continuous rating S1 (100%) Fitted with EMCO make A.C. failsafe Electro Magnetic Brake (Coil Voltage 415 Volts ). Totally enclosed Surface Cooled. (TESC) enclosure. IP 55 protection.