Method for controlling motor

Patent metadata

Field	Value
Publication number	US-10003289-B2
Application number	US-201615053516-A
Country	US
Kind code	B2
Filing date	Feb 25, 2016
Priority date	Aug 28, 2015
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A method for controlling a motor is provided. The motor control method includes deriving a motor rotational speed estimate using a speed estimator model and deriving a motor hall sensor frequency estimate based on the derived rotational speed estimate. Additionally, a filter for noise detection is set based on the derived hall sensor frequency estimate and the derived rotational speed estimate. A motor hall sensor frequency derived from the hall sensor is then applied to a predetermined filter to detect a hall sensor noise frequency.

First claim

What is claimed is:

1. A method for controlling a motor, comprising:
deriving, by a controller, a motor rotational speed estimate using a speed estimator model;
deriving, by the controller, a motor hall sensor frequency estimate based on the derived rotational speed estimate;
setting, by the controller, a bandwidth of a filter for noise detection based on the derived hall sensor frequency estimate and the derived rotational speed estimate, wherein the bandwidth is set to allow the frequency estimate derived in the motor hall sensor frequency estimate derivation to pass therethrough;
comparing, by the controller, the motor hall sensor frequency derived by the hall sensor disposed at the motor with the bandwidth of the set filter, to determine whether the derived motor hall sensor frequency is within the bandwidth;
deriving, by the controller, the position of the rotor and the speed of the rotor using the motor hall sensor frequency derived by the hall sensor disposed at the motor when the derived motor hall sensor frequency is within the bandwidth of the filter, and operating the motor based on the derived position and speed;
detecting, by the controller, the motor hall sensor frequency as noise when the derived motor hall sensor frequency is beyond the bandwidth; and
deriving, by the controller a position of the rotor in the motor and a speed of the rotor while excluding the hall sensor frequency detected as noise and operating the motor based on the derived position and speed.

2. The method according to claim 1 , wherein the motor rotational speed estimate derivation includes deriving, by the controller, the motor rotational speed estimate using a q-axis voltage equation as to a motor rotating magnetic field.

3. The method according to claim 2 , wherein the q-axis voltage equation satisfies the following Expression:
V q =R s ×I q −L q ×( dI q /dt )+ω e ×L d ×I d +ω e ×Ψ f

wherein, V q is a q-axis voltage of a rotating magnetic field, R s is an armature coil resistance, I q is a q-axis current of the rotating magnetic field, L q is a q-axis inductance of the rotating magnetic field, ω e is the motor rotational speed estimate, I d is a d-axis current of the rotating magnetic field, and Ψ f is an armature magnetic flux linkage generated by permanent magnets.

4. The method according to claim 1 , wherein the motor rotational speed estimate derivation includes deriving, by the controller, the motor rotational speed estimate using an equation based on a relationship between torque and load in the motor.

5. The method according to claim 4 , wherein the equation based on the relationship between torque and load in the motor satisfies the following Expression:
T q =J×θ″+B×ω e +K×ω e 2
wherein, T q is a rotational torque of the motor, J is a rotational inertial momentum of the motor, θ″ is a rotational acceleration of the motor, B is a rotational frictional coefficient of the motor, ω e is the motor rotational speed estimate, and K is a line resistance coefficient.

6. The method according to claim 1 , wherein the motor hall sensor frequency estimate derivation includes deriving, by the controller, the motor hall sensor frequency estimate using the following Expression:
f=ω e /2π

wherein, f is the hall sensor frequency estimate, and ω e is the motor rotational speed estimate.

7. The method according to claim 1 , wherein the filter has the bandwidth derived by multiplying a motor rotational speed estimate variation by a safety factor.

8. The method according to claim 1 , wherein the filter has the bandwidth derived using the following Expression:
B=α×Δω e /π

wherein, B is the bandwidth, α is a safety factor, and Δω e is a motor rotational speed estimate variation.

9. The method according to claim 1 , wherein the filter has the bandwidth derived using map data to provide the bandwidth as an output based on the motor rotational speed estimate as an input.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee Dong Hun
• Ryu Chang Seok
• Kang Min Su
• Kim Sung Do

Classifications

• H02P6/17 Primary

  and for generating speed information · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title

• H02P23/14

  Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage · CPC title

• H02P21/18

  Estimation of position or speed · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title