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參數(shù)資料
| 型號： | TA7713P |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.025 A, PDIP20 |
| 封裝： | 0.300 INCH, 2.54 MM PITCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 505K |
| 代理商： | TA7713P |
TA7713P
2003-08-04
5
(2) Stopping function
For stopping the motor, it is the simplest way to stop the inertia through the friction after turning off the
motor driving power supply.
However, since too much time is required for stopping the motor having a large inertia, this method is not
suitable to the video disk or audio disk player which requires the disk changed in a short time.
In this case, the motor is changed over to the reverse torque state at the same with the input of the stop signal,
and the brake is applied keeping the state of normal rotation with reverse torque as an usual method.
In this method, however, reverse runaway is liable to occur unless the reduction of rotation is detected through
a certain measure to stop the reverse torque state at an appropriate time.
(For example, PLL motor controller TC9142AP is provided with the circuit by which the reverse rotation signal
is output at the same time with the stop signal input, and the reduction of rotation speed in this reverse torque
state is detected by FG signal to disconnect the reverse rotation signal when the rotation speed reduced down
to 1 / 8 the initial speed.)
In case of the motor of high rotation speed and large inertia like the motor for video disk, to perform the quick
braking operation, it is necessary to keep this condition of the forward rotation with reverse torque until just
before the motor stops in order to reduce the inertia stopping time to the minimum through the friction force.
For this purpose, in TA7713P, the state of forward rotation with reverse torque is kept continued until the
motor stops and either of three position sensing signals detects the reverse rotation with the builtin reverse
sensing circuit.
(In case of application of TA7713P, there is no problem in the optical system, however, it is of course necessary
to put the sensor apart from the disk at the same time with the stop signal input or before the reverse rotation
start in VHD CED system.)
At this time, the state of the reverse rotation is max. 60
° in electrical angle.
Furthermore, in order to remove the inertia due to this reverse rotation, the inside monostable multivibrator
generates the time normal torque determined by the state of C2, R2 and pin (10) to turn out the
inertiastopped state afterwards.
By means of these functions, the motor can be stopped in 5~8 seconde with the optical system of high rotation
speed and in 2~3 seconds with VHD CED system.
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