R&M Materials Handling ELECTRIC CHAIN HOISTS LoadMate Chain Hoist TMU Motorized Trolley - Manual (Page 17)

LM TMU I&M MANUAL/EN/06.15.2009
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Copyright © (2009) R&M Materials Handling, Inc. All rights reserved.
3.1 Motor
The motor insulation is class F and the degree of protection is IP55.
3.2 Description of the Gear Reducer
3.2.1 TMU VFD Gear Reducer
A single reduction gear reducer is used together with the 100/120 Hz inverter motor. Generally, this gear
motor reducer is used when the capacity of the hoist is greater than 1 ton [1000 kg]. The output pinion is cut
into the output shaft of the gearbox. Gears are lubricated with semi-fluid grease.
The 35 Hz inverter motor is used without a gear reducer. Generally, this gearless motor is used when the
capacity of the hoist is 1 ton [1000 kg] or less. The trolley wheels are directly driven from the motor.
3.2.2 TMU Two-speed Motor Gear Reducer
A single reduction gear reducer is always used together with the two-speed motor regardless of load
capacity. The output pinion is cut into the output shaft of the gearbox. Gears are lubricated with semi-fluid
grease.
3.3 Description of the Brakes
3.3.1 Compact Brake
The Compact brake is integrated into the design of the MF06 inverter motor and is AC operated - without a
separate coil for the brake. An electromagnetic force produced from the energized motor stator winding
releases the brake. Since the MF06 inverter motor is always operated with a TMU VFD that provides
dynamic braking, the compact brake is essentially a holding brake. The brake sets when the motor
decelerates to zero and a spring applies a clamping force.
3.3.2 D.C. Disc Brake
The D.C. Disc brake is mounted to the two-speed motor and utilizes a D.C. coil. The coil releases the brake
disc. Several springs apply the clamping force.