Made for students, by students Motor Selection Guide
Figure 14: Torque curve change with example 5:1 gear ratio
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| Figure 14: Torque curve change with example 5:1 gear ratio
The first step in choosing a gearing system is to determine the desired gear ratio (i). The gear ratio is the ratio between what the motor is able to continuously spin on its own compared to the desired operating point speed. As described before,12 the operating point for the ModBot is 865 mNm and 189.86 rpm and the motor selected requires an operating speed above 6000 rpm and below 12000 rpm (motor limiting speed) to achieve 17.2 W continuously, as shown in Figure 6. Many times when looking up gearing information, the desired operating point is called the load. From this point on, the operating point of the ModBot will be considered the load. Likewise, the operating point rpm will be called the load speed (nL) and operating point torque will be called the load torque (ML), as shown in Figure 15. In order to differentiate between the desired speed and torque of the gearing system’s output shaft and the speed and torque the actual motor is running at, the speed and torque of the motor will be called motor speed (nmot) and motor torque (Mmot). Using those terms, the maximum and minimum gear ratios (i) can be calculated using equation below.
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