astra_conv:conversion:drivetrain:drivetrain
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astra_conv:conversion:drivetrain:drivetrain [2013/12/30 19:23] 127.0.0.1 external edit |
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. As I was told, it can be "overboosted" by some 50 per cent for a few seconds. This is configurable on the controller. | + | 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|}} | ||
| - | You may doubt that 24kW is sufficent for a car this size - well, we will see! Anyhow, as long as it is operated in the lower rpm range, the motor can for sure take up with an engine of much higher peak power. If you spin it up to higher rpms, the low peak power will of course become obvious. | + | 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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| - | The motor is fitted for water cooling. I got the recommendation to first try without - the motor generates only very little heat. Anyhow I have already prepared the components required for a later upgrade to water cooling (including forced air cooling of the motor controller). Please see chapter [[astra_conv:conversion:motor_cooler:motor_cooler|"cooling system"]] below. | + | |
| - | + | ||
| - | 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. | + | |
| - | + | ||
| - | {{: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.1388431418.txt · Last modified: 2014/04/21 18:23 (external edit)
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