A method for phase-voltage based motor period measurement includes generating a commanded phase voltage and applying the commanded phase voltage to a first phase voltage input of an electric motor, a second phase voltage input of the electric motor, and a third phase voltage input of the electric motor, measuring a first period of a phase voltage associated with the first phase voltage input and the second phase voltage input and comparing the measured first period to a frequency of the commanded phase voltage, and, in response to a determination that the measured first period of the phase voltage associated with the first phase voltage input and the second phase voltage input is outside of a range of the frequency associated with the commanded phase voltage, identifying a fault associated with the first integrated circuit or signal path.

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.

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.

A method for synchronizing an MDPS motor and a motor position sensor may include: sequentially aligning, by a controller, a rotor of the MDPS motor by sequentially applying preset three-phase current pulses to the MDPS motor, the three-phase current pulses corresponding to one electrical-angle cycle of the rotor of the MDPS motor, and detecting an actual rotational position of the aligned rotor through the motor position sensor; determining a zero point rotational position of the rotor based on the actual rotational position; determining a reference rotational position of the rotor based on the actual rotational position and the number of pole pairs in the MDPS motor, and determining an offset rotational position of the rotor based on the actual rotational position and the reference rotational position; and correcting the zero point rotational position by adding the offset rotational position to the zero point rotational position.

A motor controller that controls a motor in a first control method based on a first current command value and a second control method based on a second current command value. The motor controller includes an analog-to-digital converter to generate the second current command value based on a reference signal externally input to the motor controller and a current limit generator to generate an upper limit value of the first current command value based on the second current command value.

One or more examples relate, generally, to reducing error in estimated angular position of a rotor of a motor.

The semiconductor device includes: a current detection circuit configured to detect a current flowing through a three-phase motor by driving of a drive circuit; and a controller configured to control the drive circuit, based on the detected current. The controller is configured to control, when the three-phase motor is stationary, an energization pattern in such a way that a wave detection current sequentially flows from the drive circuit to each phase of the three-phase motor, to obtain, from the wave detection current detected by the current detection circuit, a first, a second and a third interphase current differences, each of which is a difference among wave detection currents flowing in directions opposite to one another, to determine the energization pattern based on a magnitude relationship among the first, the second and the third interphase current differences.

The present disclosure provides a system and method for detecting a resolver signal of a motor allowing accurate detection of a peak magnitude, a peak time, a peak point, etc. of a resolver output signal. A bandpass filter and a moving average processor are configured to remove noise introduced into the resolver output signal and maintain a magnitude of the resolver output signal at original magnitude without change. A phase compensation process performed by a lead phase compensator can compensate a phase delay time for the resolver output signal.

A process for controlling an electric motor includes providing a functional relationship, which associates a first and a second quantity , indicative of a torque delivered by the electric motor and of the supply voltage respectively, with a speed parameter of the electric motor, determining a pair of values of the first and of the second quantity , determining a value of a third quantity indicative of an output speed of the electric motor, determining a value of the speed parameter corresponding to the pair of values determined through the functional relationship, determining a value of a fourth quantity indicative of a difference between the value of the speed parameter and the value of the third quantity, determining a target value for the first quantity as a function of the value of the fourth quantity, and controlling the electric motor according to the determined target value.

A process for controlling an electric motor includes providing a functional relationship, which associates a first and a second quantity , indicative of a torque delivered by the electric motor and of the supply voltage respectively, with a speed parameter of the electric motor, determining a pair of values of the first and of the second quantity , determining a value of a third quantity indicative of an output speed of the electric motor, determining a value of the speed parameter corresponding to the pair of values determined through the functional relationship, determining a value of a fourth quantity indicative of a difference between the value of the speed parameter and the value of the third quantity, determining a target value for the first quantity as a function of the value of the fourth quantity, and controlling the electric motor according to the determined target value.