Three‐phase BLDC motors are used for a wide range of applications, including electric fans, refrigerators, air conditioners, printers and multi-function peripherals (MFPs). However, conventional motor controllers and drivers have the following drawbacks:
To resolve these issues, Toshiba has developed Intelligent Phase Control (InPAC), an auto lead angle control technology, based on its outstanding motor driver IC. InPAC achieves optimized phase control by detecting the motor current phase.
|Operating supply voltage range||6 to 30 V|
|Operating output current||3 A|
|Drive method||Sine-wave drive|
|Other features||Auto lead angle: InPAC function (Voltage/current: optimized phase control)|
|Support for Hall devices and Hall ICs|
|Speed control inputs: PWM inputs or analog voltage input|
|Abnormal detection functions: Thermal shutdown, overcurrent detection, motor lock detection|
|Output on-resistance (upper + lower): 0.23 Ω typ.|
|Soft start function, settings of acceleration and deceleration rates|
|Rotation direction select pin, brake pin|
|Prevention of supply voltage overshoot|
|Package||WQFN36(5 mm × 5 mm × 0.8 mm)|
To optimize motor efficiency, the lead angle must be adjusted using actual equipment although it is controlled based on the information on rotor positions from Hall sensors.
The lead angle must also be adjusted according to the motor constants, rpm and other factors even when a motor controller/driver has an auto lead angle control function. Therefore, there has been a need for an improved control method that reduces burdens on users.
InPAC detects the motor current phase and feeds back the information for auto lead angle control. When a motor application has a sensor, the phase of the Hall signal is automatically adjusted to match that of the motor drive current.
High efficiency is achieved regardless of the rpm, load torque and power supply voltage of a motor. InPAC also helps reduce the number of external parts necessary for lead angle adjustment.
High efficiency: InPAC can achieve maximum efficiency regardless of motor rpm
Example: At 3000 rpm, InPAC reduces supply current by approx. 10% compared with the conventional fixed lead angle control.
(as benchmarked by Toshiba)