Control circuit of an electric motor with a measure delay compensation and motor system comprising the circuit

A motor system comprising:

• a tri-phase electric motor having terminals for receiving phase currents;
• and
• a control circuit configured to control the tri-phase motor, the control circuit including:
• a measuring device configured to measure a first phase current of the motor and provide a corresponding analog signal with a time delay;
• an analog-to-digital converter structured to convert the first analog signal into a first digital signal;
• a conversion module configured to generate a first converted digital signal representative of the first digital signal expressed in a rotating reference system;
• a comparison node structured to compare the first converted digital signal to a first reference signal and generate a first error signal;
• and
• a measure control circuit structured to provide to the analog-to-digital converter a timing signal that depends on the first error signal and the time delay.

A control method for controlling an electric motor comprising:

• measuring a first phase current of the motor and providing a corresponding analog signal with a time delay;
• converting, using an analog-to-digital converter, the first analog signal into a first digital signal;
• generating a first converted digital signal representative of the first digital signal expressed in a rotating reference system;
• comparing the first converted digital signal to a first reference signal and generating a first error signal based on the comparing;
• and
• providing to the analog-to-digital converter a timing signal that depends on the first error signal and the time delay.