astra_conv:conversion:drivetrain:drivetrain
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astra_conv:conversion:drivetrain:drivetrain [2014/04/21 18:44] richard |
astra_conv:conversion:drivetrain:drivetrain [2014/05/09 16:00] (current) richard |
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| ====== drivetrain ====== | ====== drivetrain ====== | ||
| - | I hope that "drivetrain" is the correct term - "motor mount, motor, clutch, adaptor plate and gearbox" would have been too long for the index to the left. | + | I hope that "drivetrain" is the correct term - it actually stands for "motor mount, motor, clutch, adaptor plate and gearbox". |
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| ==== motor ==== | ==== motor ==== | ||
| - | The motor is a brushless three-phase AC variant with nominal 24kW peak power. Depending on the controller settings, it can temporarily be "overboosted" by some 50 per cent. | + | The motor is a surprisingly heavy, brushless three-phase AC squirrel cage variant with nominal 24kW peak power. Depending on the controller settings and the squirrel's physical constitution, it can temporarily be "overboosted" by some 50 per cent. |
| The diagram shows torque (grey line) and power (violet line) vs. rotational speed. As you see, the full torque near 120Nm is available between 0 (!) and 2000 rpm, while the power peaks between 2000 and 4000 rpm. | The diagram shows torque (grey line) and power (violet line) vs. rotational speed. As you see, the full torque near 120Nm is available between 0 (!) and 2000 rpm, while the power peaks between 2000 and 4000 rpm. | ||
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| {{:astra_conv:conversion:drivetrain:motor_diagram.jpg|}} | {{:astra_conv:conversion:drivetrain:motor_diagram.jpg|}} | ||
| - | In practice these characteristics widely depend on the controller settings. At low RPMs, the secondary current (i.e. the current between controller and motor) becomes very high. If the controller settings are not carefully optimized, the controller tends to either go into "current limiting" mode and reduce the power, or to hysterically switch off completely. | + | In practice these characteristics widely depend on the controller settings. Please see chapter [[astra_conv:conversion:controller_box:controller_box#motor_controller_setup|"motor controller setup"]]! |
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| - | Driving experience is therefore a bit different from what the diagram would suggest - the motor needs quite some RPMs to make you happy. The power is however sufficient for accelating with ease and without feeling the constant need to "apologize" to the drivers behind you. | + | |
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| - | The motor is fitted for liquid cooling. Initially, it even worked without (at moderate ambient temperatures), but meanwhile liquid cooling is installed, together with forced air cooling of the motor controller. Please see chapter [[astra_conv:conversion:cooling_system:cooling_system|"cooling system"]] below. | + | |
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| - | Please note that the fittings used in below foto turned out not to be tight - I have changed them later. The new fittings have a flange to press a rubber gasket against the motor's case. | + | |
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| - | {{:astra_conv:conversion:drivetrain:P1100856.jpg?600|}} | + | |
| + | Forced cooling of motor and controller is described in chapter [[astra_conv:conversion:cooling_system:cooling_system|"cooling system"]] below. | ||
| + | \\ | ||
| ==== why do we still need a gearbox? ==== | ==== why do we still need a gearbox? ==== | ||
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| {{:astra_conv:conversion:drivetrain:P1080802.JPG?600|}} {{:astra_conv:conversion:drivetrain:P1080801.JPG?600|}} | {{:astra_conv:conversion:drivetrain:P1080802.JPG?600|}} {{:astra_conv:conversion:drivetrain:P1080801.JPG?600|}} | ||
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| + | The clutch initially tended to slip at moderate torque already. After some forced "grinding in", this slowly improved and after a few kilometers of driving the clutch now behaves as it should. I cannot tell whether the slipping was caused by improper contact between the surfaces of flywheel respectively pressure plate and clutch disk, or by contaminants such as e.g. coolant liquid (washing with water anyhow had not helped). | ||
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astra_conv/conversion/drivetrain/drivetrain.1398105852.txt · Last modified: 2014/04/21 18:44 by richard
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