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How do you measure the size of a DC motor?
Key criteria for selecting a DC motor includes first finding out what voltage is readily available for the application and what physical size the motor needs to be. Speed and torque can then be considered once these first two parameters are determined. 1. Voltage availability is a critical element in motor selection.
What parameter controls the speed of a DC motor?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
How to size and select a DC motor?
Key criteria for selecting a DC motor includes first finding out what voltage is readily available for the application and what physical size the motor needs to be. Speed and torque can then be considered once these first two parameters are determined. 1. Voltage availability is a critical element in motor selection.
How do you calculate the torque of a DC motor?
Measuring RPM, then Measuring Torque to create a torque/speed curve for the motor. DC motors are pretty much linear , the faster they turn, the less torque they have. Max torque occurs at stall (as does maximum current) Drawing the torque-speed curve can be done by measuring the no-load top speed and then measuring the stall torque.
How is the winding resistance of a DC motor measured?
For the winding resistance use an ohmmeter. For a dc motor measure the resistance between the 2 armature wires. If it is a WYE connected BLDC motor, the resistance is the line-to-line resistance. Thus divide the resistance(l-l) by 2 to get the phase resistance. MOTOR VOLTAGE CONSTANT Ke
How to measure the Ke of a motor?
To measure the Ke of the motor, put the motor shaft in a lathe and rotate the shaft at some speed [rpm] such as 1000rpm. With a dc motor, use a dc voltmeter to measure the armature voltage. The Ke is then the voltage you read divided by the speed in rad/sec. Convert rpm to rad/sec as- rev 2πradiansminrad x=minrev60secsec