Cooking hob with rotary driving means and cooking vessel usable with said hob

A cooking hob (1) with rotary driving means, comprising:

• a support plate (2) which has a treatment area (3) capable of supporting a cooking vessel (50) provided with rotary blades or paddles (53) connected to an upper magnetic coupling member (54);
• a lower magnetic coupling member (4) rotatably assembled on a moving support (5) below the support plate (2);
• a drive actuator (6) operatively connected for rotating said lower magnetic coupling member (4) and magnetically transmitting torque to said upper magnetic coupling member (54) of said cooking vessel (50), and
• a position change actuator (7) operatively connected to move said moving support (5) between an operative position, in which the lower magnetic coupling member (4) is close enough to the support plate (2) to magnetically transmit said torque to the upper magnetic coupling member (54) when the cooking vessel (50) is located on the treatment area (3), and an inoperative position, in which the lower magnetic coupling member (4) is far enough from the support plate (2) so as to be free from transmitting the torque;
• wherein at least one lower magnetic element (8) is installed on the moving support (5) below the support plate (2) at a predetermined distance from a lower rotating shaft (E1) of the lower magnetic coupling member (4) and at a constant predetermined angular position about said lower rotating shaft (E1) to create a magnetic attractive force on an upper magnetic element (58) installed in the cooking vessel (50) at said predetermined distance from an upper rotating shaft (E2) of the upper magnetic coupling member (54) when the cooking vessel (50) is located in a predetermined angular position on the treatment area (3) and when the moving support (5) is in said operative position.