Method for controlling a motor
AssigneeReel
InventorsEzio Bertotto, Federico Di Santo, Enrico Marodin
Life of this patent
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Abstract
A method for controlling a motor by an inverter and by a vectorial technique, comprising the following steps: determining the value of a quadrature current Iq necessary for said motor to generate the desired torque; calculating the value of a direct current to be supplied to the motor by an equation as a function of the phase of the current vector on which the torque constant of the motor depends; calculating the power current of said motor from the direct current and the quadrature current; supplying the power current to the motor through the inverter.
Claims14
A method for controlling a motor by an inverter and by a vectorial technique, comprising the following steps:
- fixing a value of a quadrature current Iq necessary for said motor to generate a desired torque;
- calculating a value of a direct current Id to be supplied to said motor by equation:
- I
- d
- =
- I
- q
- tan
-
- (
- k
- t
- )
- where kt is a phase of a current vector from which a torque constant of said motor depends;
- calculating a power current of said motor by said direct current Id and said quadrature current Iq;
- supplying said power current to said motor by said inverter;
- and
- fixing rotation speed and position of a rotor of said motor without position and speed sensors,
- wherein said step of fixing rotation speed and position of said rotor comprises a sum of an additional substantially sinusoidal power voltage to a voltage power of said motor, and
- wherein said additional power voltage has a module variable with one or more of the rotation speed of said rotor or with a torque needed by said motor with a load thereof.
A method of controlling a motor by an inverter and by a vectorial technique, comprising the following steps:
- fixing a value of a quadrature current Iq necessary for said motor to generate a desired torque;
- calculating a value of a direct current Id to be supplied to said motor by equation:
- I
- d
- =
- I
- q
- tan
-
- (
- k
- t
- )
- where kt is a phase of a current vector from which a torque constant of said motor depends;
- calculating a power current of said motor by said direct current Id and said quadrature current Iq;
- supplying said power current to said motor by said inverter;
- and
- fixing rotation speed and position of a rotor of said motor without position and speed sensors,
- wherein said step of fixing rotation speed and position of said rotor comprises a sum of an additional substantially sinusoidal power voltage to a voltage power of said motor, and
- wherein said additional power voltage has a module variable with a torque needed by said motor with a load thereof and a variable frequency fixed by a casual or pseudo casual calculating technique.
Dependencies are inferred from the claim text.