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--- projects:crazyflie:hardware:explained [2012-12-03 23:04]
tobias [Motor drivers]
+++ projects:crazyflie:hardware:explained [2013-01-12 15:54]
tobias [Specification]
@@ Line 66: / Line 66: @@
 Header pin description
-|| Pin nr || Name || Description ||
+^^ Pin nr ^^ Name ^^ Description ^^
 || 1  || VCC || Digital supply voltage ||
 || 2  || TMS || Test Mode Select ||
@@ Line 91: / Line 91: @@
 ===== Motor drivers =====
-{{:projects:crazyflie:hardware:motor_driver_wiki.png?300 |}}
+{{:projects:crazyflie:hardware:motor_driver_wiki.png?200 |}}
 The motor driver, as we use brushed motors, is a simple pull down mosfet as shown in the schematics. There is also a free-wheel diode to take the Back-EMF spikes generated by the motor during PWM-ing.
-The mosfet we choose is the PMV31XN in a SOT-23 package. It can handle a lot of power and should be good for at least 3A each. The most important property of the mosfet though might be the on resistance (Rdson) since it effects the amount of power the motors can make use of. We measured the PMV31XN Rdson at 2.8V and 0.8A to be ~40 mOhm
+The mosfet we choose is the PMV31XN in a SOT-23 package. It can handle a lot of power and should be good for at least 3A each. The most important property of the mosfet though might be the on resistance (Rdson) since it effects the amount of power the motors can make use of. We measured the PMV31XN Rdson at 2.8V G-D voltage and 0.8A D-S current to be ~40 mOhm.
 ===== Motors =====
+We use a coreless brushed DC motor 6x15mm.
+==== Specification ====
+**Electrical**
+|| Description || Value ||
+|| Rated voltage || 4.2 V Max ||
+|| Nominal voltage || 3.7 V ||
+|| No load speed || 45000 ±15% RPM ||
+|| No load current || 80 mA Max ||
+|| Starting voltage || 0.8 V Max ||
+|| Rated load speed || 21000 ±15% RPM ||
+|| Rated load current || 810 mA Max ||
+|| Resistance || 2.3 ±20% Ω ||
+**Mechanical**
+|| Description || Value ||
+|| Shaft diameter|| 0.8 mm ||
+|| Motor diameter || 6 ± 0.05 mm ||
+|| Motor length || 15 mm ||
+|| Weight || 1.6g approx.||

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