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### Author Topic: Need Help With Circuit Diagram  (Read 850 times)

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#### roylimyk

• Jr. Member
• Posts: 8
##### Need Help With Circuit Diagram
« on: August 06, 2012, 08:13:16 AM »
Hi,
I need a Circuit Diagram to Drive the following DC Motor.

3 Pole DC Motor
Operating Voltage : 6V ~ 72V
Speed RPM: 7500 ~8900
Current 0.7 ~ 7.5A

I need a circuit diagram to get the maximum juice out of this motor, by using 12V Batteries Source.

Or can you tell me how to get extra juice from a motor.

Thank You.

#### Mr. Ninja

• Jr. Member
• Posts: 35
##### Re: Need Help With Circuit Diagram
« Reply #1 on: August 06, 2012, 02:08:06 PM »
One circuit diagram (h-bridge) here.
http://www.instructables.com/id/Arduino-RC-Lawnmower/step2/The-Motor-Driver/

Or, drawing my own(please forgive me if I get this wrong):

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: Need Help With Circuit Diagram
« Reply #2 on: August 06, 2012, 03:30:14 PM »
Hi,

Operating Voltage : 6V ~ 72V
I bet you missed a decimal point here

I need a circuit diagram to get the maximum juice out of this motor, by using 12V Batteries Source.

Or can you tell me how to get extra juice from a motor.
You don't get "juice" out of a motor. "Juice" is slang for current and the motor takes it, rather than give it (unless you use it as a generator).

Driving a 7.2V motor from 12V, either use PWM and/or diodes or similar to drop the voltage - you can usually go around 25% above nominal voltage, provided you monitor the temperature (40°C max), so up to 9V might work. Temperature rise limits the lifetime of a DC motor.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### waltr

• Supreme Robot
• Posts: 1,905
##### Re: Need Help With Circuit Diagram
« Reply #3 on: August 06, 2012, 06:20:33 PM »
3 Pole DC motor?
Is this a Brushless motor?

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: Need Help With Circuit Diagram
« Reply #4 on: August 07, 2012, 05:41:11 PM »
Hi,

Good catch waltr
That would be a bit more of a circuit then, but luckily there's quite a number of brushless controller chips to do the grunt work.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### roylimyk

• Jr. Member
• Posts: 8
##### Re: Need Help With Circuit Diagram
« Reply #5 on: August 07, 2012, 08:44:26 PM »
actually its a brushed motor...and like i said..its a 6v~72v..not a 7.2v...
http://www.genetron.com.sg/files/Motor%20Catalog%20050908.pdf

#### roylimyk

• Jr. Member
• Posts: 8
##### Re: Need Help With Circuit Diagram
« Reply #6 on: August 07, 2012, 08:46:07 PM »

#### roylimyk

• Jr. Member
• Posts: 8
##### Re: Need Help With Circuit Diagram
« Reply #7 on: August 08, 2012, 08:40:04 AM »
the size of the car is abut 1 to 10 scale of a normal car..

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: Need Help With Circuit Diagram
« Reply #8 on: August 08, 2012, 05:25:12 PM »
Hi,

From your photo, it looks like there's a gear box, but if you changed the motor...
Did you keep the gear box and if so, did you fit it correctly?

Where did you get this motor?
The pdf file is placed on a server where they sell refrigeration stuff, so itøs probably an employee or a family member that sells the motors privately. Have you got a link to where you got it?
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### roylimyk

• Jr. Member
• Posts: 8
##### Re: Need Help With Circuit Diagram
« Reply #9 on: August 11, 2012, 02:14:17 AM »
Hi,