Washing machine fitting multiple motors and tub thereof

A washing machine, comprising:

• a tub storing washing water and including a first motor mounting portion and a second motor mounting portion;
• a rotary drum installed in the tub;
• a rotation shaft rotatably supporting the rotary drum;
• and
• a motor to drive the rotary drum,
• wherein the first motor mounting portion is provided on a rear wall of the tub to mount the motor coaxially with the rotation shaft and the second motor mounting portion is provided on an outer peripheral surface of the tub to mount the motor at a lower side of the tub.

A washing machine, comprising:

• a tub;
• a rotary drum capable of receiving laundry to be washed installed in the tub;
• a rotation shaft connected to the rotary drum to rotate the rotary drum;
• a first motor mounting portion affixed to the tub and the rotation shaft;
• a second motor mounting portion affixed to the tub;
• and
• a motor of a first type of motor and a second type of motor selectively attached to the washing machine at one of the first motor mounting portion or the second motor mounting portion.

A washing machine, comprising:

• a tub;
• a rotary drum capable of receiving laundry to be washed installed in the tub;
• and
• a motor selectively attached to a rear of the tub or a bottom of the tub.