Search found 253 matches

by francisco.shi
Yesterday, 17:51
Forum: The Lounge
Topic: hello, new here
Replies: 4
Views: 108

Re: hello, new here

I have an old engine for my dirt bike and the other day I saw some 30kw RC airplane brushless motor and started thinking of doing the same. I just didn't have the courage to do all that.
by francisco.shi
Thu, 16 Jan 2020, 11:17
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 235
Views: 41773

Re: 4Springs' Brumby

I think you are being too aggressive. I think I used some 600 sand paper and did it by hand. Only a few strokes and then quickly applied the contact grease. Then they could sit for a few min while I did the other tabs. From memory I think I folded the sandpaper and did both sides of the tab at the s...
by francisco.shi
Thu, 16 Jan 2020, 09:20
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 235
Views: 41773

Re: 4Springs' Brumby

Only the copper tabs are nickel plated. I had a lot of trouble with contact overheating on the aluminium tabs until I removed the oxide and applied contact grease.
by francisco.shi
Thu, 16 Jan 2020, 06:30
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 235
Views: 41773

Re: 4Springs' Brumby

You just need to polish them to remoce the oxide layer and quickly apply some electrical contact grease and clamp them. That is what I did and it seemed fine the contact resistance was as low as the contact on the copper side.
by francisco.shi
Wed, 15 Jan 2020, 12:30
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I am not expecting it to be able to spin the wheels. That means that a highlux on low range and 1000kg on the back will pull the Pajero. As much as it looks impressive for a Tesla to drag a Ute it is all about grip. Any old Ute with enough weight on the back and in low range will drag any Tesla any ...
by francisco.shi
Tue, 14 Jan 2020, 07:43
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

Yes. It already does regen. The current processor is too slow to run the motor smoothly at full speed and it doesn't have enough pwm outputs to run the resolver and the 3ph bridge. So I will use a different processor on the final version. This setup is so that I can test the structural strength of t...
by francisco.shi
Sun, 12 Jan 2020, 20:18
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I have been doing some further testing of the power stage. This time driving the motor. I put some wires between the motor and the power stage because I can't get to the components when it is mounted to the back of the motor. I got a friend to lend me a board he has been using to learn about Field O...
by francisco.shi
Fri, 03 Jan 2020, 11:46
Forum: Technical and conversion discussion
Topic: My vision of a low cost electric super car
Replies: 6
Views: 267

Re: My vision of a low cost electric super car

You may be better off using a motor designed for EVs. By the time you rewind the industrial motor you will have spent not much less than buying a motor for an EV. Also the EV motors are water cooled so they will give you better performance.
by francisco.shi
Fri, 03 Jan 2020, 05:00
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I didn't know about the VESC project.
I think it is a good idea to use existing hardware.
Maybe we should start a similar project for EVs.
by francisco.shi
Fri, 03 Jan 2020, 04:40
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

It is mostly my own design. The DC-DC converters (the 3 transformers with associated drivers oscillator and rectifier on the secondaries) is a pretty standard way of doing isolated psu for gate drives. I just used newer parts for the transistors that drive the primary. There are two transistors in o...
by francisco.shi
Fri, 03 Jan 2020, 04:17
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I think they are very good cells. Having the tabs on opposite sides makes it easy to connect them together and reduces the amount of copper you need for busbars.
by francisco.shi
Thu, 02 Jan 2020, 09:43
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I have been a bit busy for a while and didn't really have time to work on the Pajero. I have managed to get back into it and I am now working on the inverter to drive the motor. I got the gate driver board made. 15779286035601025195610.jpg Here is a picture of the power module. 157792875744714568428...
by francisco.shi
Thu, 02 Jan 2020, 09:28
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

I did a group buy a while ago. I still have some left if you are interested. They are about A$65 per cell. Let me know if you want them.
by francisco.shi
Thu, 02 Jan 2020, 09:25
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 118
Views: 11959

Re: Francisco's Electric Pajero

About the motor part number is TZ210XS45H-320.
I got it from some Chinese company but it is a bit difficult to buy from them. They do not want to sell to private buyers.
by francisco.shi
Thu, 02 Jan 2020, 08:19
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 235
Views: 41773

Re: 4Springs' Brumby

The spacing was a bit tight. I didn't want to end up with a weird spacing. The screws are generally less than 5mm so they should just clear. What I found was that getting the tabs to line up perfectly was the problem. What I did to get around that problem was to make a plastic U shape with the insid...
by francisco.shi
Wed, 01 Jan 2020, 05:51
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 235
Views: 41773

Re: 4Springs' Brumby

This is looking good.
Are you making the BMS? I assume you are because it bolts to the end so you would have had to make the board to match the hole spacing.
by francisco.shi
Mon, 16 Dec 2019, 04:18
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

What is the red light on the dash?
by francisco.shi
Thu, 12 Dec 2019, 20:27
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

A mechanical scroll compressor is very quiet you can hardly hear any difference when it comes on. An electric one should be equally quiet.
by francisco.shi
Sat, 30 Nov 2019, 16:18
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

If it is overweight what can you do to make it pass?
by francisco.shi
Sun, 24 Nov 2019, 18:19
Forum: General EV Discussion
Topic: EV-Only "Fuel" Tax On The Govt Agenda
Replies: 20
Views: 893

Re: EV-Only "Fuel" Tax On The Govt Agenda

The tax will be more than the tyres. At 4c per km if a set of tyres lasts 30k km the tax would be $1200. A small car set of tyres is around $400.
by francisco.shi
Sun, 24 Nov 2019, 16:12
Forum: General EV Discussion
Topic: EV-Only "Fuel" Tax On The Govt Agenda
Replies: 20
Views: 893

Re: EV-Only "Fuel" Tax On The Govt Agenda

I think taxing tyres would be the easiest way to get a road use tax. It will be so difficult to ensure every car is done correctly. You can not use GPS unless you can ensure everyone will take the GPS with them at all times. And how about running underground? It would be too easy to block a GPS sign...
by francisco.shi
Mon, 18 Nov 2019, 12:08
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

You mentioned a date with the engineer. Can you drive the car before you get the final inspection?
by francisco.shi
Fri, 15 Nov 2019, 10:28
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

I think if you put a TX valve then a small evaporator that cools the battery coolant then the cabin evaporator it will work as long as you dont freeze the battery coolant and you do not have so much load from the battery coolant that the gas comes out warm from the first evaporator. How cold the cab...
by francisco.shi
Fri, 15 Nov 2019, 08:57
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

I am going to face the same problem. I was thinking of using the evaporator to chill water that I can then run thru whatever I need to cool down. So all you need is a pump to pump the water to either the batteries or the evaporator in the cabin. Not sure if it will be better. Having an evaporator to...
by francisco.shi
Mon, 11 Nov 2019, 10:29
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 534
Views: 40396

Re: Prelude conversion project - some questions

I think there must be some capacitor that needs to be precharged. The master contactor should only switch under load in a fault condition.
Have you tried to put a precharge resistor and checked that it is not trying to switched into a discharged capacitor?