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Brushless Motor Drivers

Leveraging sensorless drive and sine-wave drive technologies, Toshiba has been developing a broad array of brushless DC motor drivers ideal for applications that require low power consumption and silent operation.

Product Lines

Product Lines: Brushless Motor Drivers

Brushless Motor Drivers

Brushless Motor Drivers Product Lineup

Description of Intelligent Phase Control (InPAC), an Auto Lead Angle Control Technology

Description of an Auto Lead Angle Control Technology

Comparisons between auto lead angle technology and the conventional technology

Drawbacks of conventional technology

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.

Advantages of InPAC

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.

Auto lead control technology realizing high efficiency with a simple configuration
Example: At 3,000 rpm, InPAC reduces supply current by approx. 10%, compared with the conventional fixed lead angle control (benchmarked by Toshiba).

InPAC reduces supply current compared with the conventional

Simply configurable auto lead angle control

Reduces the number of external components necessary for lead angle control and eliminates the need for any programming according to the changing operating states of a motor

Motor Efficiency Ease of Programming Support for Various Types of Motors Part Count Drawback
Fixed lead angle control Poor Poor Poor Moderate Changes in the rpm of a motor make the adjustment point shift, making it impossible to achieve optimal efficiency.
Lead angle must be adjusted for each type of motor.
Auto lead angle control using conventional technology Moderate Moderate Moderate Poor
InPAC Excellent Excellent Excellent Excellent


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