mcb.getSISystemParameters

Compute base values for SI system for selected motor

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    Syntax

    SI_System = mcb.getSISystemParameters(pmsm)

    Description

    SI_System = mcb.getSISystemParameters(pmsm) computes the base SI system values for voltage, current, speed, torque, and power for a permanent magnet synchronous motor (PMSM) with parameters pmsm.

    example

    Examples

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    Get parameters for your motor. This example uses a BLY171D PMSM.

    pmsm = mcb.getPMSMParameters("BLY171D");

    Get SI system base values for these parameters.

    mcb.getSISystemParameters(pmsm)
    ans = 

  struct with fields:

    V_base: 1
    I_base: 1
    N_base: 9.5493
    T_base: 0.0314
    P_base: 1.5000

    Input Arguments

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    PMSM parameters, specified as a struct.

    Specify lumped linear parameters with the following required fields:

    • Ld — d-axis stator winding inductance (in henries), specified as a scalar

    • Lq — q-axis stator winding inductance (in henries), specified as a scalar

    • FluxPM — Permanent magnet flux linkage (in webers), specified as a scalar

    • p — Number of pole pairs, specified as a scalar

    • Rs — Stator resistance (in ohms), specified as a scalar

    • B — Viscous damping coefficient (in kg-m2/ sec), specified as a scalar

    • I_rated — Rated current (in amperes), specified as a scalar

    You can create a structure with lumped linear parameters using mcb.getPMSMParameters.

    Alternatively, specify nonlinear lookup table data with the following required fields:

    • PMSMLUT.idvec — d-axis current breakpoints (in amperes) of lookup tables, specified as a vector

    • PMSMLUT.iqvec — q-axis current breakpoints (in amperes) of lookup tables, specified as a vector

    • PMSMLUT.LdTable — d-axis inductance (in henries) lookup table, specified as matrix

    • PMSMLUT.LqTable — q-axis inductance (in henries) lookup table, specified as a matrix

    • PMSMLUT.FluxPMTable — Permanent magnet flux linkage (in weber) lookup table, specified as a matrix

    or the following required fields:

    • PMSMLUT.idvec — d-axis current breakpoints (in amperes) of lookup tables, specified as a vector

    • PMSMLUT.iqvec — q-axis current breakpoints (in amperes) of lookup tables, specified as a vector

    • PMSMLUT.FluxDTable — d-axis flux linkage lookup table, specified as a matrix

    • PMSMLUT.FluxQTable — q-axis flux linkage lookup table, specified as a matrix

    Whether you specify lumped parameters or lookup tables, the structure can also contain the following optional fields:

    • model — Manufacturer's model number, specified as a character vector

    • sn — Manufacturer's serial number, specified as a character vector

    • J — Motor inertia coefficient (in kg-m2), specified as a scalar

    • Ke — Back EMF constant (in volts/krpm), specified as a scalar

    • Kt — Torque constant (in Nm/amperes), specified as a scalar

    • N_max — Maximum rotor speed (in rpm), specified as a scalar

    • PositionOffset — Rotor position offset (in PU), specified as a scalar

    • QEPSlits — Number of quadrature encoder pulse (QEP) slits, specified as a scalar

    • T_rated — Rated torque (in Nm), specified as a scalar

    Data Types: struct

    Output Arguments

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    Base values for SI system, returned as a struct with the following fields:

    • V_base — Base voltage (in volts)

    • I_base — Base current (in amperes)

    • N_base — Base speed (in rpm)

    • P_base — Base power (in watts)

    • T_base — Base torque (in newton-meters)

    Version History

    Introduced in R2020a

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    See Also

    Topics