Choosing the correct design of motor for the final application is of paramount importance. A mistake at this stage will jeopardise the life expectancy of the final product and the motor used. Micro-Motors Sales and Engineering Department are always at hand to help guide the customer to achieve the most cost effective solution for their drive requirement.
The deciding factor for the choice of motor is an operating performance determined by the torque speed curve. Please note the following points in relation to diagram 1.

Point 1- Starting torque, the required starting torque when starting the system should not exceed this value.

Point 2 - Pull out torque, this torque is the maximum torque available.

Point 3 - Operating point, the motor should be designed in such a way that this operating point automatically is reached when the motor runs in the required operation. It is defined on the torque-speed curve by the nominal speed and nominal torque.

Point 4 - No load speed - This is the speed at which the motor will run when it is connected to voltage with no load.

Changes in the operating voltage over the designed nominal voltage at the same frequency will affect the operating speed and torque. This is illustrated in diagram 1.
Motors which have been designed for 50 cycle operation can also be operated at 60 cycle. With the same voltage applied and changing the frequency input, this will affect the operating speed and torque. This is illustrated in diagram 3.
Finally, changing the resistance of the die-cast rotor with the same voltage and frequency applied will affect the operating speed and torque characteristics. Please note the following points in relation to diagram 4.

Point 1 - Low resistance die-cast rotor, particularly useful for maximum speed application (2400rpm+) where the start-up torque requirement is low.

Point 2 - Standard resistance die-cast rotor, particularly useful for mid-speed applications (2000rpm+) where start-up torque requirement is moderate.

Point 3 - High resistance die-cast rotor, particularly useful for low speed applications (2000rpm-) where start-up torque requirement is high.