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參數(shù)資料
| 型號： | TB6520PG |
| 廠商： | Toshiba Corporation |
| 英文描述： | PWM TYPE 3−PHASE FULL−WAVE SENSORLESS MOTOR CONTROLLER |
| 文件頁數(shù)： | 11/19頁 |
| 文件大小： | 391K |
| 代理商： | TB6520PG |
TB6520P/PG
2006-3-6
11
FUNCTION DESCRIPTION OF TB6520P/PG + TA8483CP
z
Three
phase sensorless drive
The TB6520P/PG detects the motor’s induced voltage (motor’s terminal voltage), compares it with VM (motor’s
power supply voltage) divided by 2, and generates a commutation signal based on the comparison result.
Therefore, the TB6520P/PG eliminates the need for the Hall elements and Hall ICs that have conventionally
been used to detect the motor’s rotor position.
z
PWM drive
The TB6520P/PG allows output duty cycles to be controlled by using its DUTY input voltage.
PWM operation is chopped by the upper
side output on / off operation.
Position detection is accomplished by monitoring the motor’s terminal voltage at falling edges of PWM and
comparing the detected voltage with the reference voltage. In this way, avoid effects of the terminal voltage on
PWM are avoided. But this causes a position detection error associated with the PWM signal frequency.
Therefore, care must be taken when using the controller for high
speed motors.
z
Startup method
At startup, no induced voltage develops because the motor is not turning yet. For this reason, the TB6520P/PG
forcibly applies a predetermined commutation pattern to the motor as it starts.
In this case, a problem occurs that the motor cannot be started smoothly depending on its rotor position.
To solve this problem, the TB6520P/PG uses single
phase excitation (by setting the IP pin high to fix the phase
and allow current to conduct in only one phase) for a predetermined period. This helps to move the rotor
position at startup forcibly to a ready to start position.
However, since the duration of single
phase excitation and the power applied for it (DUTY input voltage)
varies with each motor, adjustment is required.
About the duration of single
phase excitation
The duration of single
phase excitation (DC excitation) can be changed by adjusting the RC constant in the
application circuit shown below.
Setup example : C = 4.7 μF, R = 220 k
TB6520P/PG
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