Motor & Gearbox The mirrors are required to rotate specific angles. To be able to achieve specific angles we need a stepper motor. The stepper motor is known to divide one revolution into equal steps which is our main requirements for the rotation of the mirrors.
Figure 2-13: The Stepper Motor
The following table shows the stepper motor specifications:
Table 2-1: Stepper Motor Specifications
Current 4.2 A
Angle 1.8°
Torque 8.34 N.m The desired torque calculated to withstand the mirror weight, friction and air resistance is 69.75Nm. This torque cannot be satisfied by the stepper motor on its own since the torque the stepper motor can carry is 8.34 N.m. A worm gearbox is thus required in this situation to help raise the torque and withstand the mirror weight, friction and air resistance.
Figure 2-14: Worm Gearbox The gearbox has reduction ratio of 16. The motor and gearbox rotation angle and torque are given in the following table.
Table 2-2; Motor and Gearbox Rotation Specification Motor Gearbox
Step Angle (Degrees) 1.8 0.11
Torque (Nm) 8.34 133
4.2.2 Motor and Gearbox Assembly
The stepper motor is connect with the worm gearbox along with the driver board and power supply.
Figure 4-5: Motor and Gearbox used
Below is the assembly of the motor connected …show more content…
The driver needs to be able to satisfy the power requirements of the motor it is sending the signal to. For example it must be able to carry a load current higher than the motor’s requirements to be able to operate it. There are several types of drivers with different ratings. The driver of the motor is chosen according to certain specifications such as the current rating, type of motor and the torque needed to drive the
Figure 2-13: The Stepper Motor
The following table shows the stepper motor specifications:
Table 2-1: Stepper Motor Specifications
Current 4.2 A
Angle 1.8°
Torque 8.34 N.m The desired torque calculated to withstand the mirror weight, friction and air resistance is 69.75Nm. This torque cannot be satisfied by the stepper motor on its own since the torque the stepper motor can carry is 8.34 N.m. A worm gearbox is thus required in this situation to help raise the torque and withstand the mirror weight, friction and air resistance.
Figure 2-14: Worm Gearbox The gearbox has reduction ratio of 16. The motor and gearbox rotation angle and torque are given in the following table.
Table 2-2; Motor and Gearbox Rotation Specification Motor Gearbox
Step Angle (Degrees) 1.8 0.11
Torque (Nm) 8.34 133
4.2.2 Motor and Gearbox Assembly
The stepper motor is connect with the worm gearbox along with the driver board and power supply.
Figure 4-5: Motor and Gearbox used
Below is the assembly of the motor connected …show more content…
The driver needs to be able to satisfy the power requirements of the motor it is sending the signal to. For example it must be able to carry a load current higher than the motor’s requirements to be able to operate it. There are several types of drivers with different ratings. The driver of the motor is chosen according to certain specifications such as the current rating, type of motor and the torque needed to drive the