etard wrote: I wonder what controller he is using.
The HPD 10 motor is a notably lightweight, slowly running drive, coming with a very high specific performance and paramount efficiency. The drive is designed for the relatively low operational speed of directly driven 2-blade air screws of 1.3 to 1.5 m diameter, providing the highest possible efficiency along with only slight noise level.
It is in fact a PPS device (polyphase permanently energised solenoid synchronal machine), which is operated by a tri-phase output stage DST as brushless direct current motor. The motor has a current consumption of 190A at rated power of 10kW and electric continuous operation at 52 V battery voltage. It achieves herewith a rated speed of 2100 min-1 and a torque of 42 Nm. The threshold values are approx. 220 to 230 A, according to the output stage cooling, or 50 Nm torque accelerated during take-off phase.
The motor can also be supplied for a lower specific rotation speed/voltage upon request.
Brushless direct current motors need an electronic controller which enables the rotary motion. The three components SDC, SDI and DST constitute a unit:
the motor management system.
The setpoint for the motor voltage, as well as the enabling of the motor are effected by the operating unit SDI (Smart Drive Interface). The central control SDC (Smart Drive Control) monitors all functions and transmits the preprocessed setpoint signal to the output stage DST (frequency converter). The output stage DST is directly powered by the battery. The DST converts the direct current into a three-phase alternating current which constitutes in the stator the rotary field for the motor.
The SDC constitutes the central element of the entire motor management. The SDC monitors the motor, the battery, the electric power, the enabling signals and the system monitoring. When developing the device, the highest possible safety for motor and the user was an essential aspect. All process conditions are monitored by two independent processors. As soon as an unsafe condition appears, either caused by failure, or by incorrect operating conditions, the SDC cuts off the system. The motor is safely decelerated and then switched to currentless mode. Due to the functional principle of the brushless direct current motor it is impossible that the motor just starts to rotate.
Lock wrote:Two flavours, 10kW (about $2,700US) and 13.5kW ($3,350US)... Then they want you to buy their controllers (10kw $1,680, 13.5kW $2,300US) and they have a separate controller "graphical interface" unit for about $670US
gestalt wrote:someone with some aeronautical expertise tell me why you couldn't take something like this...
gestalt wrote:some other interesting prop design, changes the pitch of the prop while in use...
This results in substantial savings in fuel, engine wear and noise.
gestalt wrote:I just found the specs on the electraflyer and it says the thrust generated is 140lbs. So you would have to upgrade the power of the fan design to five times greater output but doesn't seem out of the realm of possibility.
etard wrote:...how much does something like that trike go for? Is it a special wing, or is a hang gliding wing retrofitted?
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