by applying the power to motor in what is full step mode, then the magnetic fields cause the motor to step full step (in your case 1.8 degrees). if you however power up the magnets differently, you can get 1/2 step mode ie in your case, .9 degrees.
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ffice:word" /><w:wrap type="topAndBottom"></w:wrap></v:shape>hopefully the controller lets you excites the stators separately so you can control full step modes and 1/2 step modes. ask the guys who made it "will it do full step and 1/2 step or even micro stepping?"
micro stepping is where you send sine and cosine waves and get smaller fractions of your full step.