Abstract: A control for brushless motors having polyphase moving coil armatures, sinusoidal commutation, and integral linear hall effect commutation sensors providing a correction signal such that the sum of the squares of the commutation signals is maintained at a predetermined constant. A sum squared correction means is used to provide an error correction signal feedback to magnetic field sensors or hall effect commutation sensors used to provide a sinusoidal commutation signal for each phase of a three phase moving coil armature such that the sum of the squares of each signal representative of the commutation signal is forced to be a predetermined constant. This has the effect of substantially reducing the motor force or torque variations typically occurring with such brushless electric motors having sinusoidal commutation. The motor force or torque variations are due in part to the hall effect sensor or magnetic field sensor gain and offset errors.