If current greater than the range setting of an ammeter passes through the meter, it blows the fuse of the meter and can damage the meter. The power supply displays current, but a multimeter should be used for accuracy. No-load = No-load speed = _ rotations/second This is the fastest that the motor will spin at this voltage. Using the fact that 2 radians = 1rotation, convert the noload speed to radians per second. Unwind the thread, counting revolutions as you go.Ĭalculate the no-load speed = rotations/time. Stop the timer when the end of the thread reaches the motor. Since you want to know the motors speed with no load, do not slow the motor down by hanging onto the thread more than necessary. It does not matter if the thread winds with slack in it you are only counting revolutions.
You will minimize tangles if you keep the thread relatively straight. Start the timer as you release the thread. Hold the motor in a stalled position with the thread wrapped one to three times around the motor shaftĠ. Attach a hub to the motor axle when the power is removed, and use the hub to anchor the end of a thread that is approximately 5 ft long. Mount the motor to the table top using a clamp and fischertechnik parts.Ġ. Measure the no-load speed of the motor by counting the motors revolutions using a thread.Ġ. Alternatively, provide power with one AA battery (not two as shown here.)Ĭonnect the power source to the motor using alligator jumper cables. Then use the voltage knob to set the voltage to 1.0 V.
This is accomplished by turning the current knob all the way clockwise. Set the DC power supply to deliver constant voltage. Vernier force sensor or other device able to measure ~200 mN Timing device for timing to 0.01 s precision
#SERATO DJ INTRO 1.2.6 DOWNLOAD HOW TO#
You will also learn how to choose a gear ratio to make a motor deliver maximum power or maximum efficiency for a given task.ĭC power supply or one AA battery and holder In this activity you will learn how to make those four measurements. These four measurements describe the most important properties of a particular motor at a given voltage. These design decisions can be made by making only four measurements of a motor. A vibrating cell phone uses a motor with an off-center load, and it needs to be designed with a gear train that delivers the most power or the highest efficiency. When designing a laptop or mobile phone, for example, an engineering team works to make the battery last as long as possible, for example. Activity 1.2.6 Maximizing Motor Power fischertechnikĪn engineer often must design a system to get the most out of limited resources.
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