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參數(shù)資料
| 型號(hào)： | TDA5144 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Brushless DC motor drive circuit |
| 中文描述： | 無刷直流電動(dòng)機(jī)驅(qū)動(dòng)電路 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TDA5144 |
June 1994
11
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5144
The oscillation of the motor is given by:
I
p
J
where:
K
t
= torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m
2
)
Example: J = 72
×
10
6
kg.m
2
, K = 25
×
10
3
N.m/A, p = 6
and I = 0.5 A; this gives f
osc
= 5 Hz. If the damping is high
then a start frequency of 2 Hz can be chosen or
t = 500 ms, thus C = 0.5/2 = 0.25
μ
F (choose 220 nF).
T
HE ADAPTIVE COMMUTATION DELAY
(CAP-CD
AND
CAP-DC)
In this circuit capacitor CAP-CD is charged during one
commutation period, with an interruption of the charging
current during the diode pulse. During the next
commutation period this capacitor (CAP-CD) is discharged
at twice the charging current. The charging current is
8.1
μ
A and the discharging current 16.2
μ
A; the voltage
range is from 0.9 to 2.2 V. The voltage must stay within
this range at the lowest commutation frequency of
interest, f
C1
:
6
–
×
f
1.3
×
f
C1
(C in nF)
If the frequency is lower, then a constant commutation
delay after the zero-crossing is generated by the discharge
from 2.2 to 0.9 V at 16.2
μ
A;
maximum delay = (0.076
×
C) ms (with C in nF).
Example: nominal commutation frequency = 900 Hz and
the lowest usable frequency = 400 Hz; so:
400
(choose 18 nF)
The other capacitor, CAP-DC, is used to repeat the same
delay by charging and discharging with 15.5
μ
A. The same
value can be chosen as for CAP-CD. Figure 9 illustrates
typical voltage waveforms.
f
osc
2
π
----------------------
------------K
=
C
8.1
10
6231
------------
=
=
CAP-CD
6231
15.6
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
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| TDA5144AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit |
| TDA5144ATD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC Motor Controller/Driver |
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| TDA5145 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit |
| TDA5145T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Brushless DC motor drive circuit |
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