Method and device for controlling polyphase synchronous rotary electrical machine, and corresponding reversible electrical machine for motor vehicle

A method for controlling a polyphase synchronous rotary electrical machine (1), said method comprising a step of controlling phase currents of said electrical machine (1) by a full-wave control (C),

• wherein said full-wave control (C, C2, C1) is generated by a pulse width modulated (PWM) signal (16) with a signal frequency (F) higher than an electrical frequency of said electrical machine,
• wherein rising or descending fronts (24, 25) of said pulse width modulated signal (16) are synchronised with first and second crossings of first and second angular switching thresholds (S1, S2) by an electrical position (θ) of said machine (1),
• wherein a duty cycle (α) of said pulse width modulated signal (16) is refreshed periodically to said signal frequency (F),
• wherein, with said electrical position (θ) being evaluated periodically at said signal frequency (F) and a current position of said electrical position (θ) being determined at a first instant, a future position of said electrical position (θ) at a second instant, consecutive to said first instant, is estimated to be equal to said current position augmented by the quotient of an electrical speed of said machine (1) at said first instant by said signal frequency (F), and
• wherein said duty cycle (α) is refreshed to said first instant according to said future position and said first and second angular switching thresholds (S1, S2).

A method for controlling a polyphase synchronous rotary electrical machine (1), said method comprising a step of controlling phase currents of said electrical machine (1) by a full-wave control (C),

• wherein said full-wave control (C, C2, C1) is generated by a pulse width modulated (PWM) signal (16) with a signal frequency (F) higher than an electrical frequency of said electrical machine,
• wherein rising or descending fronts (24, 25) of said pulse width modulated signal (16) are synchronised with first and second crossings of first and second angular switching thresholds (S1, S2) by an electrical position (0) of said machine (1),
• wherein a duty cycle (α) of said pulse width modulated signal (16) is refreshed periodically to said signal frequency (F),
• wherein said full-wave control (C, C1, C2) is a first control (17, 18) or a second control (19, 20, 21) different from said first control (17,18), and wherein said first and second angular switching thresholds (S1, S2) are respectively 0° and 180° for said first control (17, 18), or 30° and 150° for said second control (19, 20, 21).

A control device (12) of a polyphase synchronous rotary electrical machine (1) adapted to implement a method for controlling a polyphase synchronous rotary electrical machine (1), said method comprising a step of controlling phase currents of said electrical machine (1) by a full-wave control (C, C2, C1) generated by a pulse width modulated (PWM) signal (16) with a signal frequency (F) higher than an electrical frequency of said electrical machine, said control device (12) comprising an electronic control unit (7) controlling an inverter (3) connected to an on-board electrical network (2) supplied by a battery (B+), and configured to be connected to phase windings (u, v, w) of said polyphase synchronous rotary electrical machine (1), said electronic control unit (7) comprising:

• acquisition means (26) for acquisition of a speed of rotation (S2) of said polyphase synchronous rotary electrical machine (1);
• a peripheral (8) for generation of pulse width modulated signals at a predetermined signal frequency (F) comprising at least one programming register of a duty cycle (α) and alignment (24, 25) of said pulse width modulated signal (16);
• means for comparison of said speed of rotation (S2) with a predetermined nominal speed of rotation;
• a central processing unit (9) executing a first subroutine or a second subroutine periodically charging said programming register in order to generate said pulse width modulated signals (16) to control said inverter such as to produce first, pulse width modulated phase voltages (U1, V1, W1) or second, full-wave phase voltages (U2, V2, W2) according to a state of said means for comparison;
• a memory (10) for storing said first and second subroutines.