A gyro-house automatic and precise rising-lowering orientation measurement structure based on micro-rotation stepper motor is designed

which applies optimized acceleration & deceleration principal and controls well.This control method is effective and has many advantages rather than traditional manual operation.The experience result shows that stepper motor plan rising-lowering gyro can control its valid pendular range 53′～139′ and make the gyro theodolite represent fine north-seeking feature with repetition precision of 8″.