Week 9 Flow Chart and UCAP Update

The next stages in our design is to integrate motor properties (Torque and EMF constant) as well as a rough moment of inertia from Solidworks (including the passenger, drive and slave bogies, and the approx location and weight of the UCAPs) into an LT Spice simulation which will calculate things like what the four motors current draw will be, what the "load" (motors and bogie) equivalent resistance in the circuit will be (This will give us the R_equivalent in the RC calculations for the UCAPs)  as well as the power captured from regenerative braking.

 

 

This Flow Chart helps integrate controls team with wayside power team. It also makes sure everyone is on the same page. This system is Ultra Caps only. Some model numbers are referenced in blue boxes next to the actual part. Controls will be doing the programming here, this is just a preliminary flow chart to show controls what we will need from them.

 

Our On Board UCAPs will have these properties: (This will change when we calculate the current draw from the load including motor specs and Moment of inertia from bogie)(2UCAPs total)

UCAP Model # Discharging	BMOD0165 P048 BXX,CXX*
Datasheet	http://www.maxwell.com/products/ultracapacitors/48v-modules/documents
Mod Voltage	48	V
Mod Capacitance	165	F
Mod ABS MAX Current	1900	A
Mod in series	2
Mod in parallel	1
Terminal Resistance	0.00015	Ohm
ESR Ageing Factor	2	(+100%)
ESR Ageing Factor	0.8	(-20%)
ESR_dc from datasheet	0.008	Ohm
RC Resistor for Charging on board UCAPS	0.648	Ohm
Number of Resistors in series	2
Total ESR Resistance	0.032	Ohm
Total Resistance for RC Circuit	1.33	Ohm
Voltage of On Board Bank	96	V
UCAP Min V	48	V
Total Capacitance	66	F
Q_max	6336	F*V
Total Energy Stored in Bank	304	KJ

For now, our Solar Power Bank will have these properties: (This will change when we calculate the current draw from the load including motor specs and Moment of inertia from bogie) (3UCAPs total) We are planning to store enough energy here to charge the bogie (30sec) and create acceleration from stop. This power will be transferred through the wayside power rail.

UCAP Model # Discharging	BMOD0165 P048 BXX,CXX*
Datasheet	http://www.maxwell.com/products/ultracapacitors/48v-modules/documents
Mod Voltage	48	V
Mod Capacitance	165	F
Mod ABS MAX Current	1900	A
Mod in series	3.0
Mod in parallel	1.0
Terminal Resistance	0.00015	Ohm
ESR Ageing Factor	2	(+100%)
ESR Ageing Factor	0.8	(-20%)
ESR_dc from datasheet	0.006	Ohm
RC Resistor for Charging on board UCAPS	0.324	Ohm
Number of Resistors in series	3
Equivilant Resistance	0.972	Ohm
Total ESR Resistance	0.036	Ohm
Total Resistance for RC Circuit	1.008	Ohm
Voltage of Solar Bank	144	V
UCAP Min V	72	V
Total Capacitance	44	F
Q_max	6336	F*V
MAXIMUM Current each Resistor Sees	140	A
Total Power Delivered to ON BOARD BANK (30 seconds worth):	331	KJ
Total Energy Stored @Full	456	KJ		awrfgwrWFEw	IOur