buying DC motor

[tipipliou]

hi
i need a DC motor for my robot; actually 2 Dc motors; i don't know what to choose
i heard about Maxon motors;is there a better manufacturer? should i buy Brushless motor? are the encoder and speed reducer provided with the motor?
i know;lot of questions
note: the robot could reach 6 Kg and i can afford about 200$ for each motor (sorry for english mistakes)
thanks

[futmacl]

i need a DC motor for my robot; actually 2 Dc motors; i don't know what to choose
i heard about Maxon motors;is there a better manufacturer? should i buy Brushless motor? are the encoder and speed reducer provided with the motor?
note: the robot could reach 6 Kg and i can afford about 200$ for each motor (sorry for english mistakes)

Motors that can move 6 kg around (wheeled? or some other motion system?) easily start around $5. Unless you have a specific need for top-of-the-shelf motors, you do not need to spend much more; but maybe you do have a need. Unless you are particularly concerned about electrical noise or weight-to-power ratios, you don't need brushless; but maybe you are concerned about this. Unless you don't care about running the motors efficiently, you will also need a gearbox in most applications; but maybe you can also make one on your own. You didn't really provide any data that would help people answer this question.

[waltr]

I assume that you are going to drive the wheels with these motors. Therefore you will need to gear down the motor speed. So you will need to determine the output RPM of the motor/gear box. Also, will the output shaft be carrying the weight of the Bot or will the wheels be on a supporting axial?

Many motors are available with a gear box attached, many more do not. Some have built-in encoders, many don't.
DC Brushed and brushless motors require a different drive and control circuit, be sure to consider the Motor driver before buying the motors.

For a 6kg Bot there are a number of suppliers in the USA.
Here are some links to motors/gearing that may fit your needs:
http://www.robotshop.ca/motors-actuators.html
http://banebots.com/c/SPUR
https://www.zagrosrobotics.com/Index.asp?gclid=CLW07aXp0Z8CFRE55QodmjUO3A
http://www.battlekits.com/robot_motors.htm
http://www.robotmarketplace.com/products/motors_geared.html
http://www.trossenrobotics.com/c/robot-dc-motors.aspx

There are more if you do additional searches.

[tipipliou]

thanks a lot for your answers (sorry for not being very clear)
thanks

[blackbeard]

why not just use hobby servos? they're stronger then they look