(*1) It indicates what percentage of the electric energy
¡@¡@applied to the motor is used effectively as the ¡@¡@¡@¡@mechanical energy.
(*2) It means "revolutions per minute".

1. If silicon materials, which contain low molecular silicon compounds, adhere to the motor's commutator,brush or other parts, then upon rectification of the electric energy the silicon breaks down into SiO2, SiC and other constituents which produce a rapid increase in the contact resistance between the commutator and brush. Therefore great care should be taken when silicon material is used in a unit and check well at the same time that such binding agents or sealing materials are not generating gases of detrimental nature, whether used for motor mounting or applied during your product assembles. Care must be taken for an optimum selection, especially when using those of cyanicadhesive and sulfur gas.
2. When mounting your motors by means of binding agents, DON'T allow any adherence to the bearings nor intrusion into the motors.
3. Axial thrust on the output shaft could have an adverse effect on the motor life. i. e. As is produced by worm gears, fans, etc., Check the service life expected under the actual operating conditions by testing the motors installed in your application products. For heavy thrust loads, consider using something mechanical to retain the shaft end.
4. There are occasions when the internal resistance of the motor driving power source (Which contains an electrical circuit) can influence the life span of the motor. In instances where there is a low input of voltage to the motor,the internal resistance of the power source is large which may well result in an inferior motor after a short time, conversely in instances where high cyclic voltages are applied, this internal resistance is small and the motor life span is shortened. When the temperature deviates from the normal room temperature as is the case in low and high temperature situations, please note the conditions.
5. Motor life may be affected adversely by heavy radial load such as produced by rotating eccentric cams, etc., and also by vibration given from outside. DO check over such negative factors by testing the motors to the actual operating conditions in your application products.
6. If when mounting the motor and assembling the unit, equipment which emits ultrasonic waves is used there is a danger that some of the internal parts of the motor might be damaged so please take care.
7. DON'T store motors under environmental conditions of high temperature and extreme humidity. DON'T keep them also in an atmosphere where corrosive gas may be present, as it may result in malfunction.
8. Ambient and operating temperatures exert an affect more or less on motor performance and life. DO pay particular attention to the surroundings when it is hot and damp.
9. When press fitting a pulley, gear etc., onto the motor output shaft, always support the shaft at the other end or its retaining metal pad in a proper and correct way.
10. When soldering, BE SURE to finish your work quickly so as not to develop plastic deformation around the motor terminals nor to give them any forced bend or inward depression. In doing so, special care must be taken not to allow solder debris and flux to spatter into motors and precautionary measures should be taken if necessary, by covering up all the nearby holes and apertures. Any motors having snap-in terminals must also be attended carefully so as not to get flux in along the terminals, as it may cause failure in electrical conduction.
11. DON'T leave motor shaft locked while power is applied, as even a short-time lock-up may cause excess heat build up resulting in burning damage to the motor depending on its specifications.

2000

• The relationship between torque vs speed and current is inear as showed left ;as the load on a motor in reases,Speed will decrease.
• The graph pictured here represents the characteristics of a typical motor.
• As long as the motor is used in the area of high efficiency (as repres- ented by the shaded area) long life and good performance can be expected. However, using the motor outside this range will result in high temperature rises and deterioration of motor parts.

• As shown left, if the applied voltage is changed, no load peed and starting torque also change in proportion to the voltage.
• Speed characteristics at a given voltage are parallel to those at other voltages.
• Thus, a DC motor can be used at a voltage lower than the rated voltage. But, below 1000 rpm, the speed becomes unstable, and the motor will not run smoothly.

• Speed reduction by means of a gear box results in increased torque.The reduction/increase is determined by the gear ratio and efficiency of the gear box.

Over-all efficiency depends on the number of reduction stages : one average is 90% per stage. Therefore: a two stage reduction gives 90 90=80%;3 stages will be 72.9% and a 4-stage reduction 66%.The above mechanical loss effects the stall torque as shown left.Stall torque of a geared motor can be calculated using the following formula: -Motor stall torque gear ratio efficiency.

The output loading on a gear box must never exceed the manufactures "specified rated torque" as this will cause premature gear failure.
It is particularly important to observe this at slow output speeds when the calculated output torque exceeds the specified rated torque.

STANDARD GEAR MECHANISM
Other than the output gear, the gears rotate around
a shaft that is fixed to the plate.

NON-LUBRICATED METAL BEARING GEAR MECHANISM
All gears, including the output gear, are attached to the shaft and supported by non-lubricated metal bearings. This type of mech-anism is suitable for medium load applications and continuous duty cycle operation

PLANETARY GEAR MECHANISM
A heavy duty type gear mechanism using 3 mating gears to transmit torque to the output shaft. This type of mechanism is suitable for limited space applications

1. When the rotor is locked and voltage is applied to the motor terminals, the temperature of the motor windings will rise and eventually short-circuit.
2. The time until a short-circuit condition appears differs per motor type.
   It is recommended that the motor is protected against such an overload by means of a fuse, current limiter or mechanical protection.
   

1. An internally installed suppressor reduces electrical commutation noise caused by the brushes. Depending on the requirements, extra precautions sometimes are recommended such as an external capacitor, or filter circuit.
2. When driven in PWM at certain Frequencies it may occur that a motor does not start due to the combination of driving frequency and internally fitted capacitive noise suppressor.

1. When the power supply to the motor is switched off, it is advisable to allow the motor to stop rotating before reversing the supply polarity. Failure to do this will result in a very high instantaneous current.
2. It is possible to stop the motor within a few revolutions by applying a short-circuit across the motor terminals immediately after the motor is switched off. This method is very effective but may shorten brush life.

1. In some cases when a motor-gear is mounted in this position, traces of lubrication oil can contaminate the brushes and commutator thus shortening brush life or causing a short-circuit. Please contact us when vertical mounting is required.

1. A number of models can be provided with a magnetic or optical encoder.
2. Please contact us for detailed information and assistance.

FEATURE :

• Compact Size (£X22~50 mm )
• High Moto-Technology Design.
• LOW-COG brush-commutated motors provide high performance at an excellent value.
• Servo Motor feature with 7 or 11 slot armature with 4 standard windings for each item.
• Skewed armatures that reduce cogging and resinimpregnated windings for greater reliability.
• All the specification In accord with JIS & CE standard.