Three-dimensional survey device, three-dimensional survey device driving method, and three-dimensional survey device driving program

A three-dimensional survey device driving method for acquiring three-dimensional data of a measurement target, the three-dimensional survey device driving method comprising:

• a first step of calculating as an initial phase a phase relationship of a phase of the motor at a zero position of a rotary encoder that detects a rotation angle of a rotation target;
• a second step of storing the initial phase calculated in the first step as a driving parameter in a storage unit in advance;
• a third step of driving the motor by open loop control during an initial operation after power-on, and applying the driving parameter stored in the storage unit as a phase angle upon detecting the zero position of the rotary encoder;
• and
• a fourth step of driving the motor by closed loop control that uses a value of the rotary encoder.

A three-dimensional survey device driving program executed by a computer of a three-dimensional survey device that acquires three-dimensional data of a measurement target, the three-dimensional survey device driving program causing the computer to execute:

• a first step of calculating as an initial phase a phase relationship of a phase of the motor at a zero position of a rotary encoder that detects a rotation angle of a rotation target;
• a second step of storing the initial phase calculated in the first step as a driving parameter in a storage unit in advance;
• a third step of driving the motor by open loop control during an initial operation after power-on, and applying the driving parameter stored in the storage unit as a phase angle upon detecting the zero position of the rotary encoder;
• and
• a fourth step of driving the motor by closed loop control that uses a value of the rotary encoder.