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JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Motors Introduction Brushed vs. Brushless VEXpro Motors 775pro BAG Motor CIM Motor Mini CIM Motor Falcon 500 Other Motors AndyMark 9015 AndyMark RS775-125 Banebots RS-550 BaneBots RS775 18V AndyMark NeveRest NEO Motor Cart 0 Recently added item(s) × You have no items in your shopping cart. Select Store: United States Canada United Kingdom Europe Australia Asia / Pacific China My Account My Wishlist My Cart Checkout Quick Order Register Log In $USD $ Login Contact Us STEM Labs STEM Labs Certifications Forum Online Help STEM Labs STEM Labs STEM Labs Certifications Forum Online Help Search Contact Us VEX Robotics DC Motor Testing DC motors are an integral part of hobbyist and competition robotics, and proper motor selection is essential to successful robot design. To help understand this key relationship, VEX has developed an educational guide that explains the four key characteristics of DC motors and how they can be used to select the ideal motor for your application. Learn more ing DC motors and motor curves to design robots How we test: Why VEX provides the most accurate motor data possible Brushed vs. Brushless motors: What it is, what it means, and why it matters Furthermore, to ensure that users have the data needed to make such a selection, VEX will also be testing popular motors using industry-standard methods and publishing the results. Click on any of the motors below to view more details, including a complete motor curve. If you have any questions, feel free to contact prosupport@vex.com . Free Speed (RPM) Free Current (A) Maximum Power (W) Stall Torque (N · m) Stall Current (A) Falcon 500 6380 1.5 783 4.69 257 NEO Motor 5880 1.3 516 3.36 166 CIM Motor 5330 2.7 337 2.41 131 Mini CIM Motor 5840 3 215 1.41 89 BAG Motor 13180 1.8 149 0.43 53 775pro 18730 0.7 347 0.71 134 AndyMark 9015 14270 3.7 134 0.36 71 AndyMark NeveRest 5480 0.4 25 0.17 10 AndyMark RS775-125 5800 1.6 43 0.28 18 BaneBots RS-775 18V 13050 2.7 246 0.72 97 BaneBots RS-550 19000 0.4 190 0.38 84 VEX Testing Methods Motor Curves: The "Down-Up" Dyno Test VEX Robotics motor curves were developed experimentally using a down-up” dyno test. 1. A motor is spun at free speed 2. A brake is slowly applied (linearly increasing in torque over time), bringing the motor down to a predetermined RPM 3. The brake is slowly released and the motor is allowed to return to its free speed A variety of data, such as output speed, output torque, current draw, and power input/output, is taken throughout this test. The down” (brake applied) side is then averaged with the up” (brake released) side. Why "Down-Up"? The mechanics of a dyno test are crucial to developing and publishing accurate motor specifications. When a motor is spinning at free speed while attached to a dyno drum, the system contains a high amount of rotational inertia. This inertia complements the motor’s own output, creating a false reading for peak output power that can be higher than the motor’s actual performance. However, manufacturers do not always adjust for inertia cancellation when measuring their motor’s performance, and spec sheets rarely detail the circumstances under which their information was derived. By testing and averaging both the down” (inertia helping the motor) and up” (inertia resisting the motor) sides, this method is the best way to represent a motor’s true capacity. 3 Minute Peak Power Test Peak power data was acquired experimentally using the following test: 1. A motor is spun at free speed 2. A brake is quickly applied to bring the motor to 1/2 free speed (theoretical max power) 3. The motor is held at this RPM for 3 minutes and power output is recorded Note: If you know the efficiency of the motor, you can also determine how much heat is being absorbed by the motor during this test. This is also useful for learning how fast a motor conducts heat to the exterior. Locked Rotor Stall Test The locked rotor curves were created by running the following test at multiple voltages: 1. A motor is spun at free speed 2. A brake is quickly applied to stall the motor (0 RPM) 3. The motor is held locked for 5min or until the motor fails, and torque data is recorded This test helps to gauge the "durability" of the motor, experimentally determine stall torque, and observe how it handles rapid heat buildup. 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