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种子包衣3.4Rated Low Application Speed, n L—Alternator rotational speed, in rpm, which corresponds approximately to
the idling speed of the engine. This rotational speed is t at 1500 rpm for the purpo of this specification. 3.5Low Speed Rated Current, I L—Current, in amperes, which is delivered by the alternator at test voltage, V t,
and at rated low application speed, n L.
3.6Rated Speed, n R—Alternator rotational speed, in rpm, at which it supplies its rated current, I R, The rated
speed is specified as n R = 6000 rpm for the purpo of this specification.
工作报告格式
滇青3.7Rated Current I R—Minimum current, in amperes, which the alternator shall supply at test voltage, V t, and
rated speed, n R.
3.8Maximum Rated Speed, n max—Maximum continuous rotational speed for generating electric power, in rpm,
as specified by the alternator manufacturer.
3.9Current at Maximum Rated Speed, I n(max)—Current, in amperes, which the alternator supplies at test
voltage, V t and maximum rated speed, n max.
3.10Shaft Input Power, P i—Power, in watts, required to turn alternator at required speed to generate measured
current at specified V t.
3.11Maximum Drive Torque, T max—Maximum torque required to drive alternator, at a constant speed, under
specified operating conditions. (Reference Only)
4.Test Conditions
4.1The tests shall be carried out at an ambient temperature of 23 °C ± 5 °C. The actual test temperature shall be
recorded on all published performance reports.
4.2The direction of alternator rotation shall be as indicated by the manufacturer.
4.3 A battery and an adjustable resistor, R, shunted to the battery, are ud in the measuring circuit, as shown in
Figure 1.
4.4The tests shall be conducted using a fully charged lead-acid battery of the correct nominal voltage having a
nominal capacity, expresd in ampere-hours, of not less than 50% of the rated alternator current, I R (i.e., 100-A alternator will have at least a 50 A-h battery in the test circuit.)
4.5The overall capability of the test equipment shall allow parameter measurements within the following
tolerances:
a.Voltage: ±0.3%
b.Current: ±0.5%
c.Torque: ±2.0%
d.Rotational Speed: ±1.0%
e.Temperature: ±1.0 °C
4.6All measurements of current shall be carried out by adjusting the load resistor, R, to maintain a constant test
voltage, V t. Test voltages shall be recorded on all published performance reports.
4.7The measurements shall be carried out with the regulator operating normally, with its power comi
ng from the
output of the machine being tested.
4.8Measurements shall be made at the following test voltages:
a.13.5 V ± 0.1 V for 12-V nominal systems
b.27.0 V ± 0.2 V for 24-V nominal systems
If test voltages other than 13.5/27.0 are ud, they must be recorded on all published performance reports.
NOTE—Existing ISO and JIS specifications u 13.5 and 27.0 V.
5.Test Equipment Connection Diagram—For alternator tests, connections shall be made in accordance with
Figure 1.
FIGURE 1—TEST CONNECTION DIAGRAM
The voltmeter shall be connected directly to the alternator power output terminals.
The voltage drop shall be 0.5 V or less for all test conditions. The voltage drop as shown in Figure 1, is defined as V1 + V2 which is the voltage from the alternator B+ to alternator ground, minus the load voltage drop.
6.Measurement Procedure
6.1Current/Rotational Speed Characteristics
6.1.1S TABILIZED P ERFORMANCE T ESTS (R EQUIRED FOR R ATING)—Current measurement shall be taken at least at
the following rotational speeds, in rpm. The current shall be allowed to reach equilibrium (within 2% of reading for 5 min) at each individual speed before current and torque values are recorded:
a.2-A speed, 1500, 1800, 2000, 2500, 3000, 3500, 4000, 5000, 6000, n max
b.Cut-Out Speed, n0, (Indirect Measurement)—Reduce the alternator rotational speed until an alternator
output current between 5% of I R and 2 A, but not less than 2 A, is reached. Record speed and current
for graphic determination of the Cut-Out Speed: i.e., the Cut-Out Speed is determined by extension of
the current/rotational speed characteristic until the abscissa is intercted. The graphic extrapolation
shall be made after completing the measurements.
The shaft input power shall be determined for each measurement point.
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6.1.2S WEPT S PEED, T EMPERATURE S TABILIZED T EST—The alternator under test shall be warmed up for 30 min at
3000 rpm. It is, however, permissible to reduce this time if it can be shown that the temperature which would be reached after 30 min has been attained in a shorter period. The voltage and load shall be constant and equal to the test voltage, V t, and load during the warm up and measuring period.
After the warm up period, the rotational speed shall be reduced until the current is between 2 A and 0.05 I R.
Record the current and rotational speed.
Current measurements shall be taken while the speed is swept from n0 to no less than n R.
The test time shall not exceed 30 s, with constant rate of change of speed.
终将是什么意思6.1.3S WEPT S PEED, N ON-T EMPERATURE S TABILIZED T EST—Same procedure as 6.1.2, except that temperature
stabilization is not required.
6.2Cold Temperature Stabilized Performance Test (Optional)—Same procedure as 6.1.1, except at 0 °C
ambient. Recording torque data during this procedure is optional.
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6.3High Temperature Stabilized Performance Test (Optional)—Same procedure as 6.1.1, except at 100 °C
ambient. Recording torque data during this procedure is optional.
6.4Testing of Functional Ability of Regulator—The alternator shall be run at rated rotational speed and rated
current until the temperature of the regulator becomes stable. The load shall then be reduced to 10% of I R, but not less than 5 A, and a check made to determine that the voltage does not ri above the alternator voltage specified by the alternator manufacturer.
NOTE—The tting of the regulator is specific to the vehicle manufacturer.
7.Prentation of Results—Measurements of current, rotational speed, and torque characteristics shall be
prented in accordance with Figure 2. Calculations of power and efficiency are optional on Figure 2.
The tests described in 6.1.1 and 6.1.2 will produce different characteristic curves and therefore different maximum current values. The manufacturer shall indicate which test method has been ud.
7.1Displayed Rating Format—Any references to performance marked on an alternator shall follow this format:
“I L / I R A V T V”
where:家长对老师的感谢语
I L=Low Speed Rated Current
I R=High Speed Rated Current
中考宣誓V T=Test Voltage
For example: “50/120A 13.5V”
The sample size ud to generate the curves in Figure 2 shall be reported on the curve.
FIGURE 2—PRESENTATION OF RESULTS
