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Sensorless Motor Control

A technology of electric motor and control system, which is applied in the direction of motor control, motor generator control, electronic commutation motor control, etc., and can solve the problem of low efficiency of stator current

Inactive Publication Date: 2017-03-29
NIDEC MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manipulating the stator current using field oriented control at high motor speeds is inefficient because the motor operates at or near the maximum voltage level, eliminating or reducing one input variable (voltage magnitude)

Method used

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Embodiment Construction

[0019] The following detailed description of embodiments of the invention refers to the accompanying drawings. These embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments may be used and changes may be made without departing from the scope of the claims. Accordingly, the following detailed description should not be viewed as limiting. The scope of the invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.

[0020] In this specification, a reference to "one embodiment", "an embodiment" or "a plurality of embodiments" means that the referenced feature or features are included in at least one technical embodiment. In this description, individual references to "one embodiment," "an embodiment," or "embodiments" are not necessarily indicative of the same embodiment, nor are they mutually exclusive, unle...

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Abstract

The present invention relates to sensorless motor control. A motor control system includes a power inverter and a control circuit configured to control the power inverter according to a target voltage in a voltage-based control mode or according to a target current in a current-based control mode. The controller is operable to switch operation of the control circuit between the voltage-based control mode and the current-based control mode. The controller may be configured to operate the control circuit in the current based control mode at lower motor operating speeds where stator current margin is more important, and may be configured to operate at higher motor speeds Speed ​​operates the control circuit in the voltage based control mode where stator voltage headroom is more important.

Description

technical field [0001] Embodiments of the invention relate to systems and methods for controlling electric motors. Background technique [0002] Electric motors generally include a stationary part called a stator and a rotating part called a rotor. When the motor is excited with a drive waveform, the rotor rotates within (or around) the stator. An induction motor (also sometimes called an asynchronous motor) is a type of electric motor in which power is supplied to the rotor by electromagnetic induction rather than a direct electrical connection to the rotor. [0003] For a synchronous motor, the drive waveform supplied to the stator of the induction motor produces a magnetic field that rotates in time with the AC oscillations of the drive waveform. The rotor of an induction motor rotates at a slower speed compared to the stator field. This difference in rotational speed, also known as "slip", "slip frequency" or "slip speed", results in a changing magnetic flux in the ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18
CPCH02P21/18H02P21/0089H02P21/0021H02P2205/07H02P21/26H02P6/181
Inventor M·波兹克D·马塞提克
Owner NIDEC MOTOR CORP