Question 1

Locking

Accepted Answer

As a special outer rotor is used for the Power Moller’s motor, the coil will not burn out when the POWER MOLLER is locked under conductance for a short period of time. But repeated locking will raise the temperature of the motor coil and result in gradual deterioration of the insulation and eventually cause the motor to burn out.

It’s unnecessary to turn off the power when the POWER MOLLER is locked under conductance for a few seconds. However, if locking longer than 10 seconds is required, it is necessary to turn off the power or use the accumulation type.

Question 2

Contact Time/Cycle Time/Duty Cycle

Accepted Answer

Due to temperature rise of the coil winding, the minimum contact time during intermittent operation is approximately as specified below:

Example: DUTY CYCLE = TIME ON / TIME ON + TIME OFF

DUTY CYCLE = 20 SECONDS ON / 20 SECONDS ON + 20 SECONDS OFF DUTY CYCLE = 0.5 OR 50%

Question 3

Temperature Rise

Accepted Answer

The POWER MOLLER is designed to operate within an ambient temperature of -10°C (14°F) to 40°C (104°F). The temperature of the roller tube rises about 20°C (68°F) above the ambient during normal usage.

Please contact your Itoh Denki representative for information on additional POWER MOLLER models.

Question 4

Inertia and Intermittent Operation

Accepted Answer

As a result of motor inertia, the POWER MOLLER will not instantly stop rotating after the power is disconnected.
Inertia values differ in accordance with motor type, speed, operation time as well as weight of the load.
Inertia can be eliminated by using the POWER MOLLER with a built-in brake

Question 5

Brake Information

Accepted Answer

In automated conveyor lines, it is sometimes necessary to precisely stop or position the article being transferred. In these cases, the optional built-in electromagnetic brake should be used.

When not powered, the built-in electro-magnet uses spring force to lock the motor and prevent the tube rotation. The motor is released when the brake is powered (energized). Ordinarily, the power to the brake and motor is controlled simultaneously.
In most cases, an external mechanical stop can be eliminated by using the POWER MOLLER with the built-in brake. However, the stopping distance may vary slightly depending on the load, speed, etc.

In gravity lines, it is often necessary to control the descent of the load to prevent damage to the articles accumulated at the end of the line. In this case, the standard POWER MOLLER can act as a brake roller.

When the rotation speed of the POWER MOLLER is increased by 10-20% from its nominal speed, it functions as an induction generator and braking torque is applied to the load.
By incorporating POWER MOLLERS at several points in a self-traveling gravity line, speeding or congestion of the loads will be prevented.

Braking characteristics vary by POWER MOLLER model and weight transferred.

Please contact your Itoh Denki representative for additional information.

Question 6

Level of Conveying Surface

Accepted Answer

If the bottom surface of the load is not flat or the conveyor rollers are not level, then the POWER MOLLER may rotate freely and the load may not be transferred or may tend to drift. It is especially important when transferring relatively heavy loads that the static load limit of the POWER MOLLER is not exceeded.
Transferring light loads (less than 5kg) may be impeded by the resistance of idler rollers. Check to be sure that the idlers spin freely.
Due to packing (binding) bands, bulging of the bottom of the load, etc., the load may lean to one side during transfer. The use of rubber lagging on each end of the POWER MOLLER would facilitate a straight transfer of the load.

When the diameters of the roller tube and the shafts of the POWER MOLLER are the same as that of idler rollers, the existing shaft holes in the conveyor frame can be used without any modification.

If these dimensions are not the same, the level of the POWER MOLLER must be adjusted by hanging the height of the shaft holes in the frame so that the load will be evenly applied to all the rollers.

Question 7

Static Load Table

Question 8

Impact Loading

Accepted Answer

In applications where the article being transferred is dropped onto the Power Moller, reduce static load limits in the above table by 50% to compensate for the increased forces generated from impact.  As the load limit will vary considerably in accordance with the intensity of impact, allow a substantial margin of safety.

Question 9

Change in Transportation Speed

Accepted Answer

The peripheral velocity (transportation speed) of the Power Moller is dependent upon the weight and material composition of the load as well as the ambient temperature.  Please contact your Itoh Denki representative for additional technical information.

Care should be taken to avoid exposing the Power Moller too excessive shock as a result of drastic load speed changes with-in a line or between adjoining lines.  Although depending on the weight and speed of the load, typically no harm is done by load speed changes within 50% of nominal Power Moller speed.  Also slave driving idlers and load weights can have an effect on the speed of the Power Moller.

Technical Information