參數(shù)資料
型號： LM621
廠商： National Semiconductor Corporation
英文描述： LM621 Brushless Motor Commutator
中文描述： LM621無刷電機換向器
文件頁數(shù)： 6/12頁
文件大?。?/td> 224K
代理商： LM621
Three-Phase Motor Commutation
(Continued)
TABLE I. LM621 Commutation Decoder Truth Table
Sensor
Phasing
Position
Range
Sensor Inputs
Sink Outputs
Source Outputs
HS1
HS2
HS3
1
2
3
1
2
3
0–60
60–120
120–180
180–240
240–300
300–360
0
0
0
1
1
1
0
0
1
1
1
0
0
1
1
1
0
0
ON
ON
off
off
off
off
off
off
ON
ON
off
off
off
off
off
off
ON
ON
off
off
off
ON
ON
off
ON
off
off
off
off
ON
off
ON
ON
off
off
off
30 deg
0–60
60–120
120–180
180–240
240–300
300–360
1
1
1
0
0
0
0
0
1
1
1
0
1
0
0
0
1
1
ON
ON
off
off
off
off
off
off
ON
ON
off
off
off
off
off
off
ON
ON
off
off
off
ON
ON
off
ON
off
off
off
off
ON
off
ON
ON
off
off
off
60 deg
0–90
90–180
180–270
270–360
0
0
1
1
1
0
0
1
HS2
HS2
HS2
HS2
off
ON
off
off
na
na
na
na
off
off
ON
off
off
off
off
ON
na
na
na
na
ON
off
off
off
90 deg
Pin Numbers:
5
6
7
16
15
14
13
12
11
Note 1:
The above outputs are generated when the Direction input, pin 2, is logic high. For reverse rotation (pin 2 logic low), the above sink and source output
states become exchanged.
Note 2:
For four-phase motors sink and source outputs number two (pins 15 and 12) are not used; hense the ‘‘na’’ (not applicable) in the appropriate columns
above. Figure 6 shows how the required sink and source outputs for four-phase motors are derived.
TABLE II. Alternative Sensor-Phasing Names
Alternate
Phasing
Position
Range
Sensor Inputs
Corresponding LM621 Position
Range and/or Comments
HS1
HS2
HS3
0–60
60–120
120–180
180–240
240–300
300–360
0
1
1
1
0
0
0
0
1
1
1
0
0
0
0
1
1
1
Same as 30-degree phasing, but in reverse
order; i.e., only change is relative direction.
‘‘60 deg’’
0–60
60–120
120–180
180–240
240–300
300–360
0
1
1
1
0
0
0
0
0
1
1
1
1
1
0
0
0
1
Same as 60-degree phasing, but with shifted
order of position ranges; i.e., only change is
relative phasing of sensor signals.
‘‘120 deg’’
0–60
60–120
120–180
180–240
240–300
300–360
0
1
1
1
0
0
1
1
0
0
0
1
0
0
0
1
1
1
Same comment as above for ‘‘120 deg’’
phasing.
‘‘240 deg’’
0–60
60–120
120–180
180–240
240–300
300–360
0
1
1
1
0
0
1
1
1
0
0
0
1
1
0
0
0
1
Same as 30-degree phasing, but with shifted
order of position ranges, i.e., only change is
relative phasing of sensor signals.
‘‘300 deg’’
Four-Phase Motor Commutation
Four-phase motors use a 90-degree (quadrature) rotor-posi-
tion sensor phasing. This phasing scheme is also shown in
Table I. LM621 Commutation Decoder Truth Table. As
shown in Table I, the 90-degree phasing has only two rotor-
position-sensor signals, HS1 and HS2. When using the
LM621 to run a four-phase motor the HS2 signal is connect-
ed to both the HS2 and HS3 chip inputs.
6
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