Torque control device and torque control method

Abstract

To suppress vibration and noises generated in a low speed rotation zone and secure a wide low speed rotation zone by performing optimum torque control even under a condition that a load of a compressor is low. A speed control part 20, an inverter output part 22 and a drive circuit 14 controls drive voltage applied to a motor driving a compressor. In parallel, a position detection part 16 and a torque control part 18 estimate a load of the compressor. The torque control part 18 and an output voltage synthesis part 21 regulates drive voltage based on the estimated load and controls fluctuation of rotary acceleration of a rotary mechanism of the compressor.

Description

technical field [0001] The present invention relates to a torque control device and a torque control method, and more particularly to a torque control technique for efficiently driving a motor driving a compressor at a low load. Background technique [0002] In conventional air conditioners, there is known a compressor driving device in which a brushless DC motor drives the rotor of the compressor. That is, when the torque changes like a ripple, the compressor itself may vibrate and generate noise. [0003] In order to solve the above-mentioned problems, in the technology described in Patent Document 1, the operation frequency of the compressor and the current value (primary current value) of the drive current supplied to the brushless DC motor are used to control the operation of the compressor. Torque control. [0004] [Patent Document 1] JP-A-2001-119981 [0005] Therefore, in actual control, considering the durability of the machine (the life of the motor parts), the ...

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Problems solved by technology

[0006] Therefore, even when the load on the compressor is small, control is performed in consideration of the maximum load, and from the viewpoint of the secondary current value, even if there is a margin, the primary current value is set low. , resulting in the problem of not being able to adequately control the torque

[0007] In particular, in the case of a 1-cylinder (sylinder) type compressor, since sufficient torque control cannot be performed, there is a problem that the low rotation speed range cannot be secured reliably.

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