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參數(shù)資料
| 型號(hào)： | LM621 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM621 Brushless Motor Commutator |
| 中文描述： | LM621無(wú)刷電機(jī)換向器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 224K |
| 代理商： | LM621 |
Typical Applications
(Continued)
FOUR-PHASE EXAMPLE
Figure 6 is typical of the circuitry used to commutate a four-
phase motor using the LM621. This application is seen to
differ from the three-phase application example in that the
LM621 outputs are utilized differently. Four-phase motors
require four-phase power switches, which in turn require the
commutator to provide four current-sinking outputs and four
current sourcing outputs. The 18-pin package of the LM621
facilitates only three sinking and three sourcing outputs. The
schematic shows the 30/60 SELECT input in the 30-degree
select state (pin 8 high) and rotor-position sensor inputs
HS2 and HS3 connected together. This connection trun-
cates the number of possible rotor-position input states to
four, which is consistent with the 90-degree quadrature ro-
tor-position signals provided by four-phase motors. With the
LM621 outputs connected as shown, this approach pro-
vides the needed power-switch drive signals for a four-
phase motor. Note that only four of the six LM621 outputs
(SINK
Y
1 and
Y
3, and SOURCE
Y
1 and
Y
3) are used
directly, and that these are also inverted to form the remain-
ing four. SINK
Y
2 and SOURCE
Y
2 outputs are not used.
HALF-WAVE DRIVE EXAMPLE
The previous applications examples involved delta-config-
ured motor windings and full-wave operation of the motor.
The application shown in Figure 7 differs in that it features
half-wave operation of a motor with the windings in a Y-con-
figuration. This approach is suitable for automotive and oth-
er applications where only low-voltage power supplies are
conveniently available. The advantage of this power-switch-
ing scheme is that there is only one switch-voltage drop in
series with the motor winding, thereby conserving more of
the available voltage for application to the motor winding.
Half-wave operation provides only unidirectional current to
the windings; in contrast to the bidirectional currents applied
by the previous full-wave examples.
TL/H/8679–11
FIGURE 6. Commutation of Four-Phase Motor
10
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| LM621N | LM621 Brushless Motor Commutator |
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| LM6211MFX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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