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stepper motor

i want to increase stepper motor speed up to 1000 rpm, i am using atmega32 microcontroller so,it's Mimimum delay is 5ms.means 60 rpm,when i decrease the delay, stepper motor should be not work properly,so plz tell me how to increase stepper motor speed, can i use drive(optocoupler)??,then plz tell me how???

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