progressively slower motor speed region 3 of the curve is a severe overload region of operation wherein high increases in torque and current occur while motor speed drops to zero characterized as a 34 stall 34 condition the fold back characteristic of this portion of the curve is due to the torque ripple of the motor and the motor stalls where the rotor delivers a minimum torque with a constant current fig1 b shows a motor speed torque characteristic which is achieved with the present invention wherein region 1 is still dependent upon the motor design characteristics region 2 is a nearly idealized vertical line indicating the motor will deliver substantially constant torque over a wide operating range of speed conditions region 3 of the conventional drive characteristics is virtually eliminated with the present invention fig2 shows an overall block diagram of the present invention this figure may be referred to throughout the following specification to properly reference the particular circuits of the invention which are described in greater detail herein fig2 illustrates in block diagram form the interconnection of the various circuits to be described herein and shows the overall layout of the apparatus form of the invention certain of the boxes shown in fig2 are not described in detail herein as they are represented by conventional commercially.