Motor control apparatus

Patent metadata

Field	Value
Publication number	US-9985570-B2
Application number	US-201514926351-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Nov 4, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A motor control apparatus that estimates a temperature of a temperature estimation target element at a time of energizing the motor and drives a motor by controlling an electric power is provided. The motor control apparatus includes a primary delay arithmetic unit that outputs a primary delay response as an amount of temperature change, a sensor value adder that adds a sensor value of a temperature sensor to the amount of temperature change, an offset adder that adds an offset temperature to an output of the sensor value adder, a response constant determination portion that determines the gain and the time constant, and an offset temperature determination portion. At least one of the response constant and the offset temperature is changed according to a supply voltage or an input voltage.

First claim

What is claimed is:

1. A motor control apparatus that estimates a temperature of a predetermined temperature estimation target element at a time of energizing a motor and drives the motor by controlling an electric power supplied by an electric power converter, the motor control apparatus comprising:
a primary delay arithmetic unit that
receives a current square value of a current supplied to the motor or a time average of an integrated value of the current square value, and
outputs, as an amount of temperature change, a primary delay response calculated using a gain and a time constant;

a sensor value adder that adds a sensor value of a temperature sensor to the amount of temperature change;
an offset adder that adds an offset temperature to an output of the sensor value adder;
a response constant determination portion that determines the gain and the time constant of the primary delay arithmetic unit, the gain and the time constant being a response constant; and
an offset temperature determination portion that determines the offset temperature,
wherein:
at least one of the response constant and the offset temperature is changed according to a supply voltage that is supplied to the temperature estimation target element, or an input voltage that is supplied to the electric power converter, and
the offset temperature determination portion sets the offset temperature to be larger from a lower limit value to an upper limit value, as the supply voltage inputted to the offset temperature determination portion is greater.

2. The motor control apparatus according to claim 1 , wherein:
the temperature estimation target element is a voltage dependent element in which power consumption changes according to the supply voltage;
the temperature of the voltage dependent element is estimated; and
the offset temperature determination portion changes the offset temperature according to the supply voltage supplied to the voltage dependent element.

3. The motor control apparatus according to claim 1 , wherein:
the temperature estimation target element is
a switching element of the electric power converter, or
a voltage dependent element in which a power consumption changes according to the supply voltage;

the temperature of the temperature estimation target element is estimated; and
the response constant determination portion changes the response constant according to the input voltage supplied to the electric power converter.

Assignees

• Denso Corp

Inventors

• Endoh Go

Classifications

• H02P29/64 Primary

  Controlling or determining the temperature of the winding · CPC title

• H02P21/22

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

• B62D5/0409

  Electric motor acting on the steering column · CPC title

• H02P1/26 Primary

  for starting an individual polyphase induction motor · CPC title