You are also encouraged to look at the Drive Motor Sizing Tutorial, where you will find all the equations used in this tool complete with explanations. The Mountz torque calculator allows you to convert torque measurement from one type of unit measurement to another. The radius of tyre as r and then calculate the relation between the torque available at the wheel shaft and the force applied on the road. Example: A gear reducer with 1000 in/lbs of input torque, an input. Calculation of motor torque when it is rated in kilowatts: Calculation of motor torque when it is rated in horsepower: Where, Torque N.m: Torque in Newton-meter. Output Speed Input Speed / Ratio of Gear Reduction. gear ratio formulas: Ouput Torque Input Torque x Ratio of Gear Reduction. Click each link for more explanation about the effect of each input value. To find the output torque and speed of a gear reducer, use these. Kv is the motor velocity constant, measured in RPM per volt (not to be confused with kV, the abbreviation for kilovolt). If you are not certain about what value to enter, try to make a good "educated" guess. The constant Kv (motor velocity constant, or the back EMF constant) is a value used to describe characteristics of electrical motors. The motor will now be able to move significantly more weight at a more reasonable speed. A 225:1 geardown is added to proportionally reduce the speed and increase the torque: 12000 rpm / 225 = 53.3 rpm and 0.1 x 225 = 22.5 kg-cm. For example, an unloaded DC motor might spin at 12000 rpm and provide 0.1 kg-cm of torque. Adding a geardown both reduces the speed and increases the torque. Gear motors are essentially DC motors with an added geardown. For example, an unloaded motor of Kv, 5,700 rpm/V, supplied with 11.1 V, will run at a nominal 63,270 rpm (5,700 rpm/V × 11.1 V). To get feedback of the angle or the speed of the motor, consider a motor with an encoder option. The Kv rating of a brushless motor is the ratio of the motor’s unloaded RPM to the peak (not RMS) voltage on the wires connected to the coils (the back EMF ). Without a geardown, DC motors turn very fast (thousands of revolutions per minute (rpm)), but have little torque. The Amount of Torque Needed to Drive a Load with and with out Preload. They come in an almost infinite variety of speeds and torques to suite any need. DC motors are generally used for continuous rotation drive systems, though can be used for partial (angle to angle) rotation as well. The Drive Motor Sizing Tool is intended to give an idea of the type of drive motor required for your specific robot by taking known values and calculating values required when searching for a motor.
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