Texas Instruments DRV8313 Evaluation Module DRV8313EVM DRV8313EVM データシート
製品コード
DRV8313EVM
Phase A
Phase B
Phase C
0
60
120
180
240
300
360
Rotor Electrical Position (Degrees)
V
th
Commutate Instants
BOTTOM Switches
Phase A
Phase B
Phase C
Phase A
Phase B
Phase C
TOP Switches
Unipolar 2-Quad Drive
InstaSPIN
Appendix A InstaSPIN-BLDC Implementation
InstaSPIN-BLDC is TI’s one of the key flagship motor control technology targeted for cost sensitive
sensor-less BLDC applications. This sensor-less technique uses traditional trapezoidal or 120°
commutation and monitors motor flux by integrating back-EMF of non-energized phase to determine the
commutation instances. For certain market, such as fan, pumps, and blowers etc which do not require
high accuracy speed control and fast dynamic torque response, InstaSPIN-BLDC implementation from TI’s
MSP430G2x Value line device is right way to meet low cost requirements.
sensor-less BLDC applications. This sensor-less technique uses traditional trapezoidal or 120°
commutation and monitors motor flux by integrating back-EMF of non-energized phase to determine the
commutation instances. For certain market, such as fan, pumps, and blowers etc which do not require
high accuracy speed control and fast dynamic torque response, InstaSPIN-BLDC implementation from TI’s
MSP430G2x Value line device is right way to meet low cost requirements.
For any trapezoidal control of BLDC Motor, for each 60 electrical degrees, only two inverter legs are active
and deliver the power to motor while third inverter leg is kept in High impedance state by switching off
both high side and low side switches. In case of Uni-polar two quadrant drive, PWM is applied only to high
side switch of one active leg while low side switch of other active leg is kept ON continuously for one 60
electrical degree, we need 3 PWM outputs and 3 active signals.
and deliver the power to motor while third inverter leg is kept in High impedance state by switching off
both high side and low side switches. In case of Uni-polar two quadrant drive, PWM is applied only to high
side switch of one active leg while low side switch of other active leg is kept ON continuously for one 60
electrical degree, we need 3 PWM outputs and 3 active signals.
Figure 15. Implementation of 2-Quardent Uni-Polar PWM
16
InstaSPIN-BLDC Implementation
SLVU815 – November 2012
Copyright © 2012, Texas Instruments Incorporated