Vacuum cleaner, control method, device and system for brushless direct current motor

A technology of brush DC motor and control method, which is applied in the fields of vacuum cleaners, control devices of brushless DC motors, and control systems of brushless DC motors, and can solve problems such as low reliability, small torque, and out-of-step, and achieve reliability High, improve the starting torque, and realize the effect of accurate commutation

Inactive Publication Date: 2018-10-09
JIANGSU MIDEA CLEANING APPLIANCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the control system, open-loop forced commutation is a control blind zone. During the low-speed operation stage of the brushless DC motor, the rotor position of the brushless DC motor cannot be obtained, and the generated torque is small, which is prone to out-of-step phenomena , less reliable

Method used

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  • Vacuum cleaner, control method, device and system for brushless direct current motor
  • Vacuum cleaner, control method, device and system for brushless direct current motor
  • Vacuum cleaner, control method, device and system for brushless direct current motor

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Embodiment Construction

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] The control method of the brushless DC motor, the non-transitory computer-readable storage medium, the control device of the brushless DC motor, the control system of the brushless DC motor and the vacuum cleaner according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0038] figure 1 is a flow chart of a control method for a brushless DC motor according to an embodiment of the present invention. Such as figure 1 As shown, the control method of the brushless...

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Abstract

The invention discloses a vacuum cleaner, a control method, a control device and a control system for a brushless direct current (DC) motor, wherein the method comprises the following steps: obtaininga temperature-phase resistance meter, a temperature-phase inductance meter and a bus voltage-phase current change rate table offline; in the low-speed operation phase of the brushless DC motor, acquiring a conducting phase positive terminal voltage, a conducting phase negative terminal voltage, a non-conducting phase opposite potential voltage, a bus current instantaneous value, a bus voltage, and a current winding temperature during the high-level period of each PWM control cycle; acquiring a phase current change rate according to the bus voltage and the bus voltage-phase current change ratetable, and acquiring a phase resistance and a phase inductance according to the current winding temperature, the temperature-phase resistance meter and the temperature-phase inductance meter; acquiring a flux linkage value of the brushless DC motor according to the above parameters, and determining whether the flux linkage value is greater than the commutation threshold; and if so, performing commutation. Therefore, the accurate commutation of the motor may be realized in the low speed running phase of the motor, the motor may be prevented from being out of step, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control method of a brushless direct current motor, a control device of a brushless direct current motor, a control system of a brushless direct current motor and a vacuum cleaner. Background technique [0002] At present, in the technical field of sensorless drive control of brushless DC motors, there are many methods for detecting the rotor position of the motor, among which the back EMF zero-crossing method is simple, effective and widely used. The basic principle of the back EMF zero crossing method is that when the back EMF of a certain phase winding of a brushless DC motor crosses zero, the direct axis of the rotor coincides with the axis of the phase winding, so as long as the back EMF zero crossing point of each phase winding is judged, it can be Know the rotor position of the motor. However, when the brushless DC motor is running at low speed, the back EMF of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
Inventor 吴偏偏万德康王浩东
Owner JIANGSU MIDEA CLEANING APPLIANCES
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