MTD6502B-L 데이터 시트보기 (PDF) - Microchip Technology

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MTD6502B-L

5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver

Microchip Technology 

MTD6502B

3.8 BEMF Coefficient Setting

Km is the electro-mechanical coupling coefficient of the

motor (also referred to as “motor constant” or “BEMF

constant”). Depending on the conventions in use, there

may be some inconsistency in the exact definition of

Km and its measurement criteria among different motor

manufacturers. In order to work with various motor

applications, the MTD6502B offers various options to

adopt a wide range of BEMF coefficient. The BEMF

coefficient (Km) is defined as the peak value of the

phase-to-phase BEMF voltage, normalized to the

electrical speed of the motor.

TABLE 3-2: KM OPTIONS

Km (mV/Hz) Range

Phase-to-Phase

Min

Max

3.25

6.5

6.5

13

13

26

Option

0

1

2

DS25003A-page 10

 2011 Microchip Technology Inc.

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