08. MOTOR SEIZING AND ADAPTER SEIZING - Q-Div-2022-2023-Odd/Repo-9 GitHub Wiki
Motor sizing for Threshing Machine.
DC Motor
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Mass of the body to hold(m)= 0.372kg
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Diameter = 2.7
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Acceleration due to gravity(g) = 9.81
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Coefficient of friction (COF) = 0.3
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F = m*g
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F = 0.372*9.81
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F = 3.658N
Now considering friction
- f=(COF)mg
- f=0.3*3.658
- f=1.09N
Now torque : f*(D/2)
- T=1.09*2.7
- T=2.96kg-cm
Now considering Factor of safety i.e., FOS=1.5
- Final Torque = T*FOS
- Final Torque=2.96*1.5
- Final Torque=4.5 The torque gets divided among 4 pully system so the Final Torque is divided by 3 Hence,
- Final Torque = 4.5/3
- Final Torque = 1.15 By comparing with the table of specification for 1.15 Kg-cm==1.2 Rated Torque ,we need DC Motor of [email protected]
Adapter SEIZING
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There are total 4 dc motors
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DC motor-12kg-cm torque --> Motor is of 300RPM
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Load current of the DC motor = V/R
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Voltage used for DC motor=12V
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Maximum Load current of DC motor is 300mA
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No Load current of DC motor is 60mA
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As we are using total of 4 DC motors
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So total Load current is 4*300=1200mA
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AS factor of safety is = 1.2
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Total load current is 1200*1.2=1440mA at 12V