US 7,548,038 B2 · Controller for motor

Abstract

A controller for a motor is capable of reducing the amount of energization required to operate a motor under a predetermined condition, the motor having two rotors disposed around a rotating shaft. The controller includes an induced voltage constant command value determiner which determines an induced voltage constant command value (Ke_c) of a motor such that a difference (ΔVp) between a target voltage circle radius (Vp_target) and a magnitude (Vp) of the vector sum of a d-axis voltage command value and a q-axis voltage command value of the motor decreases, a rotor phase difference acquirer and a rotor phase difference command value determiner which change a rotor phase difference on the basis of the Ke_c, and a field weakening current correction value calculator which determines a field weakening correction current ΔId_vol on the basis of ΔVp and adds the determined ΔId_vol to the d-axis current command value in the case where Vp cannot be reduced to Vp_target or less by reducing Ke_c to a lower limit of a rotor phase difference changing range.

Claims14

Dependent claims

A controller for a motor adapted to control an operation of a permanent magnet field type rotary motor having a first rotor and a second rotor, which have a plurality of fields made of permanent magnets and which are disposed around a rotating shaft, by field control carried out by changing a rotor phase difference as a phase difference between the first rotor and the second rotor, the controller comprising:

an inverter circuit for converting DC power supplied from a DC power source into multiphase AC power to be supplied to an armature of the motor;
a rotor phase difference command value determining means for determining a command value of the rotor phase difference in a direction in which a magnetic flux of a field of the motor increases in the case where the magnitude of a resultant vector of the voltages between the terminals of armatures of individual phases of the motor is smaller than a predetermined voltage that has been set to be not more than an output voltage of the DC power source;
and
a rotor phase difference changing means for changing the rotor phase difference on the basis of a command value of the rotor phase difference.

1 more element

A controller for a motor adapted to control an operation of a permanent magnet field type rotary motor having a first rotor and a second rotor, which have a plurality of fields made of permanent magnets and which are concentrically disposed around a rotating shaft, by field control carried out by changing a rotor phase difference as a phase difference between the first rotor and the second rotor, the controller comprising:

an inverter circuit for converting DC power supplied from a DC power source into multiphase AC power to be supplied to an armature of the motor;
a rotor phase difference command value determining means for determining a command value of the rotor phase difference in a direction in which a magnetic flux of a field of the motor decreases in the case where the magnitude of a resultant vector of voltages between the terminals of armatures of individual phases of the motor is larger than a target voltage that has been set to be not more than an output voltage of the DC power source;
and
a rotor phase difference changing means for changing the rotor phase difference on the basis of a command value of the rotor phase difference.

1 more element

Dependencies are inferred from the claim text.

Controller for motor

Life of this patent

Controller for motor

Life of this patent

Abstract

Claims14