PURPOSE: To perform temperature compensation or low speed setting of a DC motor easily without deteriorating maximum torque, by a method wherein voltage by dividing voltage generated in a reference voltage source is generated in a resistor connected between collectors of first and second transistors through a buffer circuit.

CONSTITUTION: In an electronic governor, a DC motor 6, a first transistor 10, a resistor 12 corresponding to internal resistance of the DC motor 6 and a second transistor 14 are installed between a power source terminal 2 and a ground side terminal 8, and a resistor 16 is installed between collectors of the transistors 10 and 14. A comparator 20 compares reference voltage Vref of a reference voltage source 24 with back electromotive force generated in the DC motor 6, and controls the base currents of the transistors 10 and 14. The reference voltage Vref is divided by a voltage dividing circuit 32, and the divided voltage Vs is applied to the resistor 16 through a buffer circuit 26. Temperature compensation is performed by the resistor 16.