Motor control chip needs no sensor
The Toshiba TB6575FNG is a PWM sensorless controller for three-phase full wave brushless DC motors.
Available now from Marktech, the Toshiba TB6575FNG is a PWM sensorless controller for three-phase full wave brushless DC motors.
A brushless DC (BLDC) motor is a synchronous motor, which means the rotor position has to be known to generate the appropriate field.
BLDC motors are popular because of their durability, linear control characteristics, efficiency and torque-to-volume ratio.
Normally sensors (usually Hall-effect devices) are used to determine the rotor position.
These sensors are a disadvantage because they add to the system cost, are a source of failure, require extra wires, and are sensitive to EMI.
The TB6575FNG provides sensorless commutation and PWM current control for three-phase full-wave BLDC motors.
Rotation speed is controlled through a variable PWM duty cycle controlled by an analogue input voltage.
On receiving an analogue voltage command input, the rotor is aligned to a known position in DC excitation mode.
The rotation is started in forced commutation mode by applying a PWM signal to the motor.
As the rotor moves, back-EMF is measured and applied to the position signal input pin.
Subsequently the device switches from forced commutation to natural commutation (based on the back-EMF sensing) to drive the BLDC motor in sensorless mode.
Quantity pricing for the TB6575FNG is $1.40 in 5000-unit lots with free samples currently available.
Not what you're looking for? Search the site.
Categories
- Active Components (11,500)
- Passive Components (3,116)
- Design and Development (9,448)
- Enclosures and Panel Products (3,339)
- Interconnection (2,989)
- Electronics Manufacturing, Production, Packaging (3,162)
- Industry News (1,927)
- Optoelectronics (1,687)
- Power Supplies (2,414)
- Subassemblies (4,783)
- Test and Measurement (5,122)