US 2018/0006588 A1 · Rotor Flux Angle and Torque Trajectory Control Apparatus and Methods

Abstract

Low speed and high speed estimates of rotor angle and speed relative to the stator are received from a low speed estimator and a high speed estimator, respectively. LS_θ_EST and a subset of torque-controlling I_Q trajectory curve (“IQTC”) parameter values appropriate to low speed rotor operation are selected for rotor speeds below a low speed threshold value ω_LOW_THRS. HS_θ_EST and a subset of IQTC curve parameter values appropriate to high speed rotor operation are selected for rotor speeds above a high speed threshold value ω_HIGH_THRS. LS_θ_EST and the low speed subset of IQTC parameter values remain selected for rotor speeds less than ω_HIGH_THRS after accelerating to a rotor speed greater than ω_LOW_THRS. HS_θ_EST and the subset of high speed IQTC parameter values remain selected for rotor speeds greater than ω_LOW_THRS after decelerating to a rotor speed less than ω_HIGH_THRS.

Claims17

Dependent claims

A field-oriented control (“FOC”) motor controller integrated circuit (“IC”), comprising:

a low speed estimator to generate a low speed estimate of a flux angle of a rotor (“LS_θ_EST”) in a motor;
a high speed estimator to generate a high speed estimate of the rotor flux angle (“HS_θ_EST”) in the motor;
and
an acceleration control logic module coupled to the low speed estimator and to the high speed estimator to track LS_ω_EST and HS_ω_EST relative to a low rotor angular velocity threshold value ω_LOW_THRS and a high rotor angular velocity threshold value ω_HIGH_THRS.

1 more element

A field-oriented control (“FOC”) motor controller, comprising:

a low speed estimator to inject an excitation voltage signal (“V_D_EXC”) into a stator current control portion of the FOC controller;
a high speed estimator to calculate variations in a back-EMF induced in the stator windings by rotating magnetic fields associated with permanent magnets embedded in the rotor during a time when the rotor is in a rotating state;
and
an acceleration control logic module coupled to the low speed estimator and to the high speed estimator to track LS_ω_EST and HS_ω_EST.

1 more element

Dependencies are inferred from the claim text.

Rotor Flux Angle and Torque Trajectory Control Apparatus and Methods

Life of this patent

Rotor Flux Angle and Torque Trajectory Control Apparatus and Methods

Life of this patent

Abstract

Claims17