Brushless Motor No-Load Current - Understand / Efficiency / Measure скачать в хорошем качестве

Brushless Motor No-Load Current - Understand / Efficiency / Measure

The Brushless motor Current is also known as the no load constant. There are three motor constants on a brushless motor. 1) Kv, 2) Io, and 3) Rm. The no load current is the current that the motor draws with no load applied at a specific voltage. Motor manufactures typical standard for Io is measured with 10 volts applied. This Io motor constant represent the Iron losses in the motor. The power being consumed is partially due to losses caused from hysteresis, eddy current in the iron core as well as mechanical losses found in the bearings. It is extremely easy to measure no load constant of a motor. SImply connect your system as it would apply in a typical radio controlled application. Next, remove anything that is connected to the motors output shaft. Then connect an ammeter up to the battery side terminal to the ESC. Completing the measurement this way does include the ESC as part of the losses. However, in today's age, ESC's are quite efficient and any losses are considered negligible. If you are concerned with losses from the ESC, use a high current rated ESC.