Training machine with automatic control of a gravitational load

A process for controlling an electric motor of a training machine, comprising an automatic control of a gravitational load, wherein the training machine includes a gravitational load coupled to force transmission means, by means of which the gravitational load is movable by a user exerting a force on said force transmission means, the training machine further comprising a first shaft, rotatably coupled to said transmission means and to a first end of a torsion spring, the electric motor having a rotatable second shaft coupled to a second end of the torsion spring, the training machine also comprising a first rotation angle sensing means sensing a rotation angle B of the first shaft and a second rotation angle sensing means sensing a rotation angle A of the second shaft, wherein the process comprises the following steps:

• A. setting a target value of angular difference between the second and first shafts;
• B. receiving first and second rotation angles B and A respectively from said first and second rotation angle sensing means;
• C. checking whether a difference (A-B) of the sensed rotation angles A and B from said second and first rotation angle sensing means is larger than the target value;
• D. if the outcome of checking step C is positive, decreasing power to the electric motor;
• E. if the outcome of checking step C is negative, increasing power to the electric motor;
• F repeating steps from A to E until control of the the electric motor is disabled.

A computer-readable memory medium, having a program stored therein, wherein the program is a computer program comprising code means adapted to perform, when operating on a processing means of a training machine, a process for controlling an electric motor of a training machine comprising automatic control of a gravitational load, wherein the training machine includes a gravitational load coupled to a force transmission means, by means of which the gravitational load is movable by a user exerting a force on said force transmission means, the training machine further comprising a first shaft, rotatably coupled to said transmission means and to a first end of a torsion spring, the electric motor having a rotatable second shaft coupled to a second end of the torsion spring, the training machine also comprising a first rotation angle sensing means sensing a rotation angle B of the first shaft and a second rotation angle sensing means sensing a rotation angle A of the second shaft, wherein the process comprises the following steps:

• A. setting a target value of angular difference between the second and first shafts;
• B. receiving first and second rotation angles B and A, respectively, from said first and second rotation angle sensing means;
• C. checking whether a difference (A-B) of the sensed rotation angles A and B from said second and first rotation angle sensing means is larger than the target value;
• D. if the outcome of the checking step C is positive, decreasing power to the electric motor;
• E. if the outcome of the checking step C is negative, increasing power to the electric motor;
• F. repeating steps from A to E until control of the the electric motor is disabled.