1. Apparatus for accelerating unsticking of stationary and moving electromagnet armatures in an electromagnetic injector, comprising: an injector control signal generator; an electromagnet having a main winding for receiving signals from said signal generator, and an auxiliary winding for receiving opposing signals; a computer connected to said signal generator for outputting square or rectangular signals to the main winding; an amplifier connected between said computer and said main winding; means for supplying the auxiliary winding with an opposing signal immediately upon cessation of a control signal from said signal generator, said means comprising: means for shunting the trailing edge of a control signal from said computer, a first monostable connected to said shunting means for producing a square or rectangular signal of a required length, a second monostable in series with said first monostable for adjusting the start of the square or rectangular signal produced by said first monostable, and an amplifier connected between said monostables and the auxiliary winding for transmitting a square or rectangular signal to said auxiliary winding.