Small electric motors are available in both AC and DC types. DC motors offer certain advantages over AC units. They are typically more compact, have a higher power to weight ratio and speed can be controlled by varying the supply voltage.

Several years ago, Igarashi developed an AC motor program based on the design of a DC motor. These motors have the same compact construction as the DC motors and are sometimes even available with an internal rectifying system.

The final specifications can be adapted to customers needs to produce an ideal solution. An individual characteristic curve is provided for each motor based on the operating voltage.

There are 4 curves shown in the diagram:

• The speed curve (N) that is a straight line and can be shifted parallel to the original curve by increasing or reducing the voltage. The point where the speed curve intersects the x-axis represents the stall torque.
  
• The current consumption curve (I) is also a straight line and gives the current consumption from no load to stall.
  
• The output power curve (W) shows the power over the torque range.
  
• The efficiency curve (%) is a curve that can be calculated as a quotient of the output power and the power consumption over the torque range.