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參數(shù)資料
| 型號(hào)： | TB6520PG |
| 廠商： | Toshiba Corporation |
| 英文描述： | PWM TYPE 3−PHASE FULL−WAVE SENSORLESS MOTOR CONTROLLER |
| 文件頁(yè)數(shù)： | 12/19頁(yè) |
| 文件大?。?/td> | 391K |
| 代理商： | TB6520PG |
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TB6520P/PG
2006-3-6
12
z
Changing and stopping revolutions
(1)
The motor speed or revolutions can be changed by adjusting the V
DUTY
voltage (TB6520P/PG input
voltage).
(2)
To stop the motor, drop V
DUTY
to 0 V.
z
About stepping
out
Monitor the TB6520P/PG’s speed detection signal (FG output) to see if a FG signal of the designated frequency
is returned. If not, the motor has stepped out of synchronization, so restart it.
z
About overcurrent limiting operation
The TA8483CP’s overcurrent detection function works in such a way that the motor current is detected using
an external resistor and when the voltage that develops in the resistor exceeds the reference voltage V
RF
, the
ISD signal is driven high. The TB6520P/PG limits the ON
time of the PWM signal (output by the
TB6520P/PG) at a rising edge of the ISD signal. The ON
time of the upper
side power transistor in the
TA8483CP is thereby limited.
z
Lead angle control
The TB6520P/PG determines the commutation timing based on the changeover point (zero
cross point) of the
induced voltage and reference voltage Vn (= VM (motor’s power supply voltage) divided by 2).
During forced starting commutation, the motor operates with a lead angle of 0 degrees. After the motor
switches over to normal
speed operation, the lead angle is automatically changes to 15 degrees.
(Lead angle of 0 degrees : For 120
degree switch
on, current starts conducting 30 degrees behind the
zero
cross point. Lead angle of 15 degrees : Current starts conducting 15 degrees behind the zero
cross point.)
Note that depending on motor characteristics, the waveform of the induced voltage may be distorted, causing
the zero
cross point to slip out of place. The commutation timing also is thereby made to drift.
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