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Sample calculation for a motor with 14-pole anchor and switch position „Car" (bipolar
anchor):
Display value at V = 8.0 and display value at RPM = 42000
42000 rpm / 8.0 V = 5250 rpm per Volt = value in the display at KV
42000 rpm / 14 (number of poles) = 3000 x 2 (switch position „Car" for bipolar)
= 6000 rpm = actual speed of the motor
Display value at KV = 5250
5250 rpm / 14 (number of poles) = 375 x 2 (switch position „Car" for bipolar)
= 750 rpm / Volt = actual speed at KV
Practical tip:
The maximum possible display value for speed (rpm) is 99999, for revolutions per
Volt (KV) 9999. In a few cases it can occur that the maximum possible display values
are not sufficient. In such case measure the motor in switch position „Flight".
However, you will then have to use the multiplier 6 instead of 2 in the formula.
• Connect the motor tester to a suitable rechargeable battery using the universal clamps of the
accumulator connection cable (fig. 1, pos. 12). After connecting, a beep is released and the
display is illuminated. Now the motor tester is activated. In the display (fig. 1, pos. 3) you can
see the current operating voltage (V).
When connecting the motor tester to an accumulator please implicitly observe the
correct polarity: red = plus and black = minus. Avoid short circuits! Non-observance
will damage the motor tester. Warranty will become void!
Practical tip:
We recommend to power the motor tester with a high-quality 2-cell accumulator with
at least 3000 mAh and a current load capacity of 20 C and above.
In practice model-makers have committed themselves to a certain plug system to
connect the accumulator to a model or to a charging set. For a comfortable reverse
polarity protected connection of the motor tester, we recommend equipping the
accumulator connection cable of the motor tester with the same plug system.
• To measure the motor briefly press the button „Mode/Start" (fig. 1, pos. 8). The motor starts.
In the LED display for the speed (fig. 1, pos. 2) the first three LEDs light up. In the display
(fig. 1, pos. 3) the current values of the input voltage (V), idle speed (RPM), idle current (I)
and revolutions per Volt (KV) are displayed.
• You can now change the speed via the buttons „Dec" (fig. 1, pos. 6) and „Inc" (fig. 1, pos. 7).
Pressing „Dec" reduces the speed until standstill of the motor and successively expired
LEDs. Pressing „Inc" increases the speed and further LEDs will be lit. The full speed is
reached with all LEDs lit.
In principle, the speed should only be increased slowly. Otherwise, for example with
very powerful motors, it can happen that the motor tester terminates the test run if
the speed is increased too fast (display: „Motor disconnected"). In this case
disconnect the motor tester shortly from the accumulator and restart the test.
• The button „Stop" (fig. 1, pos. 5) ends the test run. In the display the last measurements are
frozen and can be read comfortably. The displayed values will be overwritten by a new test,
and after disconnecting the accumulator, respectively.
Function 2, checking Hall sensors:
Hall sensors in brushless motors have the task of giving „feedback" to the speed controller,
about where a magnet is positioned in the motor at what point of time. Motors with such
sensors were often used in the early stage brushless motors. This technology has the
advantage that a speed controller could be realised „forcibly controlled" and thus technically
easier. Such motors are rarely offered today due to the technical progression. Mostly special-
purpose motors are equipped with Hall sensors today. In case of failures of the Hall sensors
the motor has at least a loss of performance or does not function anymore at all.
To review the Hall sensors proceed as follows:
• Connection of motors with Hall sensors is made in the same way as described under
„Information about operation - determine motor data". Additionally, you have to plug in the
sensor connection cable into the connectors of the motor and the motor tester (fig. 1, pos.
10).
• The test mode for Hall sensor is activated automatically as soon as the motor tester has been
connected to the accumulator, and after the determination of the motor data with the button
„Stop" has been completed, respectively.
• The LEDs of the Hall sensor display (fig. 1, pos. 4)
now have to be lit in a certain order. For this
observe figure 2.
• Manually revolve the motor shaft slowly until LED „A" is lit. Afterwards turn the motor a little
further (motor „locks in place" at the next magnet). Now both LEDs „A" and „B" have to be
lit.
• Turn the motor a little further in the same direction again and follow the LED displays shown
in figure 2 until the LED „A" is again the only one lit. The Hall sensor of the motor is working,
if the LED displays are shown as depicted in figure 2. If this order is different than depicted
or all LEDs are lit at the same time, and the LEDs are not lit at all, respectively, the Hall
sensors are faulty.
Function 3: „Automatic"
The motor tester is equipped with an „Automatic" regulating a connected motor to a
predetermined speed (up to approx. 7.2 V) as of an idle speed (approx. 2.5 V). At this the
interval speeds can be varied.
This function is very practical, for example, if a motor is to be „run in" or a function check is to
be made. Considering the maximum admissible current of 18A this can even be made for a
motor already built into a model. Thus a direct comparison of the idle current consumption of
the motor dismantled or built-in can be made and thus conclusions can be drawn with regard
to the possible friction losses of the motor.
To activate this function, proceed as follows:
• Connection of motors is made in the same way as described under „Information about
operation - determine motor data".
• To activate the automatic function keep the button „Mode/Start" impressed for approx. 2
seconds. The display now switches to the depiction of the automatic mode. In the display the
following values can be seen: „V=7.2V" (Display flashes = preset of the maximum value =
analogous to the voltage the speed of the motor increases or decreases), „RPM=0, T=5" and
„I=0.0A".
• Via the buttons „Dec" and „Inc" you can now set the maximum value. The lowest value is
2.5V, the highest value is 7.2V.
• Press „Stop" button. Now „T=5" is flashing. Via the buttons „Dec" and „Inc" you can now set
a value between 1 to 10. The higher the value is set, the longer the ramp takes from the lowest
speed to the preset maximum speed (e.g., at 6.0V). If the „Dec" button is impressed long
enough „T=F" appears in the display. In this position the interval is turned off. After using the
start button the motor will start running with the preset voltage (between 2.5V and 7.2V).
• Now the automatic function can be started using the button „Mode/Start". The function can
be terminated again with the button „Stop". If you want to change back to the normal test
mode press and hold the button „Mode/Start" down for approx. 2 seconds.
Caution!
If you use the automatic function with a motor built-in into a model, the risk of
accidents increases due to the variety of moving or rotating parts. For such a test
setup we highly recommend a thorough fixation of the model on a workstand.
Furthermore the maximum admissible parameters (see technical data) must not be
exceeded.
Disposal
Electrical and electronic products do not belong in the household waste!
Please dispose of the device when it is no longer of use, according to the current
statutory requirements.
Technical Data
Operating voltage: .............................. 7.4 to 8.4 Volt
Maximum admissible load current: .... 18A at 8.4V
Speed display: .................................... max. 99999
Display revolutions/Volt: ..................... max. 9999
Display tolerances: ............................. +/- 5%
Turns: .................................................. at least 2.5 or higher
Display: ................................................ 2 lines á 16 characters, illuminated
Fig. 2
These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1,
D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in
technology and equipment reserved.
© Copyright 2010 by Conrad Electronic SE.
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