For the sake of this discussion, assume that the coupling adds no load to the motor and that the load from the brake does not include unknown frictional components. At stall, measure the torque from the brake and the motor current. Now increase the torque to the motor just to the point where stall occurs. Using an adjustable torque load such as a small particle brake or an adjustable hysteresis dynamometer, a load can be coupled to the motor shaft.
#Fast calc ltd series#
A current probe is ideal for this measurement since it does not add resistance in series with the operating motor. Also, measure the motor current under this no-load condition. Using a voltage supply set to 24 V, run the 2668W024CR unloaded and measure the rotational speed using a non-contacting tachometer (a strobe, for instance). If a controller with trace recording capability is not available, then we can also use some basic lab equipment to characterize a motor under stall, nominal and no load conditions. This is probably the quickest method for obtaining the data to plot a torque-speed curve, but it is not the only method. For example, the MC3 family of motion controllers (the MC 5004, MC 5005 and MC 5010) all can measure a plethora of motion parameters. They can also provide an accurate snapshot of motor operation in great detail. Most controller manufacturers offer software, such as the FAULHABER Motion Manager, which includes a trace recording function that plots voltage, current, position, speed, etc. Many parameters can be obtained directly by using a motion controller, such as one of the FAULHABER MC3 motion controllers. If you have a few fundamental pieces of laboratory equipment, you can measure the torque-speed curves for a 2668 CR series coreless dc motor at a specified operating point. The 2668W024CR has a nominal voltage of 24 V. The following discussion will describe the construction of a set of torque-speed curves for a typical DC motor from a series of raw data measurements. Normally, torque-speed curves are generated by plotting motor speed, motor current, mechanical output power, and efficiency as functions of the motor torque. While the use of torque-speed curves is much more common in technical literature for larger DC machines than it is for small, ironless core devices, the technique is applicable in either case. One commonly used method of plotting motor characteristics graphically is the use of torque-speed curves. First we’ll explain a more empirical approach, then we’ll perform a theoretical calculation. We’ve provided a method below to determine the motor parameters using the 2668W024CR coreless DC motor as an example.
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