Low voltage Roller table motors

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Low voltage Roller table motors Sizes 180 to 450 Roller table drives Frequency converters Roller table motors Rating plates Ordering information Technical data Variant codes Dimension drawings Motor construction Motors in brief Total product offering ABB’s portfolio of drives

Roller table drives — 01 A single frequency converter consists of 1) rectifier, 2) DC link, 3) inverter unit, and 4) electric supply. 02 A Multidrives system, which has 1) separate supply section, 2) common DC bus, 3) drive sections, and 4) electric supply (normally from transformer). Roller tables incorporate a number of motors, the speed of which can be steplessly controlled by one or more frequency converters. The rolling mill environment places severe stress on roller table drives. As plates and billets travel along the roller table at high speeds, the motors driving the rollers are subjected...

— 03 Principle diagram for a common DC bus 03 ACS880 multidrives are based on a common DC bus arrangement, with a single power entry and common braking resources for several drives. There are a number of alternatives on the supply side, ranging from simple diode supply units up to highly sophisticated IGBT supply units. The construction of a multidrive simplifies the total installation and provides many advantages. In multimotor applications, the common DC bus and single power line connection for a number of drives represents a very efficient solution when compared with separate, single small...

— 05 Parallel connected modules a constant DC voltage, the motor has to be over dimensioned to allow for the lower output voltage. The following formula gives an approximate calculation of rectifier power: 06 Line current in a contant torque application A regenerative supply enables the roller table motors to quickly reverse direction. This is essential to accommodate the reversing duty cycle of the table, which involves repetitive motor braking. Regenerative braking of the whole system may also be needed during controlled or emergency stops. Srectifier = SPmotoring / 0,96 - SPgenerating x 0,96...

Roller table motors General The roller table motors supplied by ABB are squirrel cage motors which are specially designed for use with frequency converters. Robust in construction, the motors are fully sealed to withstand the tough conditions in rolling mills. The motors are low speed units intended for direct connection to rollers. The pole number and frequency can be selected, avoiding the need for gearboxes and therefore saving on maintenance costs and increasing the overall efficiency of the drive. The motors are totally enclosed, frame cooled motors, with no external cooling fan, in accordance...

Roller table motors Terminal box — 01 Terminal box M3RP 180 to 250 02 Terminal box M3RP 280 to 450 The terminal box is located on the top of the motor at the N-end. In frame sizes 180 to 250 the terminal box is integrated with the stator frame. In larger motors the terminal box can be rotated 4 x 90°, with the cable direction from the N-end as standard. Terminal boxes positioned either on the left or right side of the motor are available on request. The terminal board has three terminals for the power leads and one terminal for earthing. All the motors are equipped with an external earthing stud...

Roller table motors Bearings Lubrication intervals Roller table motors are fitted with 63-series single row deep groove ball bearings. Alternatively, a cylindrical roller bearing can be used at the D-end of the motor, if required. The bearings are axially spring loaded, thus eliminating the bearing clearance. This improves bearing resistance to vibrations while allowing for normal thermal expansion. The D-end of the motor is equipped with a fixed bearing. The motors are provided with regreasable bearings. Motor sizes 315 to 450 have insulated bearings at N-end as standard. ABB follows the L1-principle...

Lubrication intervals in duty hours Motor size Bearing seals Roller table motors are equipped with labyrinth sealing at D-end. N–end is totally enclosed. This construction gives a proper protection in demanding environment against water and dust. Stator winding The stator winding is designed for use with frequency converters in the rolling mill environment. The motors are electrically designed for a certain speed range in order to minimize the current and enable use of the smallest possible frequency converter. Roller table motors typically run at low speeds and have high peak torque demands,...

Rating plates — 01 Rating plate 02 Regreasing instructions

Ordering information Explanation of the product code Motor type Motor size Product code Mounting arrangement code, Voltage and frequency code, Generation code Example Motor type Positions 8 to 10 Serial number Variant codes if needed Product code Rated output Totally enclosed fan cooled motor with cast iron frame squirrel cage Mounting arrangement (IM-code) Pole number The product code of the motor is composed in accordance with the following example. When placing an order, please state the following minimum data in the order, as in the example. Variant codes - (Dash) Position 12 Mounting arrangement...

Technical data Roller table motors, 1000 - 750 r/min IP 55 - IC 411 - Insulation class F, temperature rise class B Torque Output kW Motor type Product code Speed r/min Power factor Technical data on request. The two bullets in the product code indicate the choice of mounting arrangement, voltage and frequency (see the orderin

Technical data Roller table motors, 345 r/min IP 55 - IC 411 - Insulation class F, temperature rise class B Output kW Motor type Product code Speed r/min Power factor Technical data on request. The two bullets in the product code indicate the choice of mounting arrangement, voltage and frequency (see the ordering inform