Off-line Identification Method of Motor Phase Resistance
An identification method and phase resistance technology, which are used in the control of generators, motor generators, electronic commutation motor control, etc., to achieve the effect of reducing costs
Active Publication Date: 2019-01-29
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem of using EEPROM to store motor phase resistance parameters in current air conditioners, and provides an off-line identification method for motor phase resistance
Method used
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Embodiment
[0030] The motor phase resistance offline identification method of the embodiment of the present invention includes the following steps:
[0031] Step 1. Select the bridge arm along the way.
[0032] Step 2. Control the inverter to turn on the selected upper bridge arm, and turn off the other upper bridge arms, so that in one PWM cycle, the current flows from the DC bus voltage through the upper bridge arm during the conduction time of the upper bridge arm. The upper bridge arm IGBT flows into the corresponding coil of the motor, and then flows out from the other two phases of the motor and the lower bridge arm IGBT connected to it.
[0033] Step 3. In the remaining time of the current PWM wave cycle, turn off all three upper bridge arm IGBTs, and the current flows into the corresponding motor coil through the freewheeling diode in the lower bridge arm corresponding to the previously turned on upper bridge arm, and from the other side of the motor Two phases and its connected...
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The invention relates to the air-conditioning technique. In order to solve the problem that an EEPROM (Electrically Erasable Programmable Read-Only Memory) storage motor phase resistance parameter is required to be adopted in an existing air conditioner, the invention provides a motor phase resistance off-line identification method, which has the technical scheme comprising the following steps of enabling a selected one-path upper bridge arm to be in a PWM (Pulse-Width Modulation) period; enabling current to flow into a coil corresponding to a motor through the upper bridge arm from direct-current bus voltage, and flow out from other two phases of the motor and connected lower bridge arms within the conducting time of the upper bridge arm; within the remaining time, closing all three-path upper bridge arms, enabling the current to flow into a corresponding motor coil through a fly-wheel diode in a lower bridge arm corresponding to the previously conducted upper bridge arm, and flow out from the other two phases of the motor and the connected lower bridge arms IGBT (Insulated Gate Bipolar Translator); calculating to acquire coil resistance of the phase of the motor through a motor operation equation and IGBT characteristics. The motor phase resistance off-line identification method provided by the invention has the beneficial effects that an EEPROM storage motor phase resistance is not required any more, and the motor phase resistance off-line identification method is suitable for a motor.
Description
technical field [0001] The invention relates to air-conditioning technology, in particular to a technology for off-line identification of phase resistance of an air-conditioning motor. Background technique [0002] The frequency conversion motor control technology in traditional air conditioners requires motor manufacturers to provide parameters such as motor phase resistance, which is determined by the motor control model determined, where r is the phase resistance of the motor, L d , L Q are the motor d-axis inductance and q-axis inductance respectively, K E is the constant of the back electromotive force of the motor, ω is the current running angular velocity of the motor, U d , U q are the d-axis voltage and q-axis voltage of the motor respectively, I d , I q are the d-axis current and q-axis current of the motor, respectively. When a large number of different motors need to be controlled, the motor parameters are often stored in a similar EEPROM, and the control...
Claims
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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 陈跃杜志孝涂小平刘启武唐婷婷程远银任艳华高向军
Owner SICHUAN CHANGHONG ELECTRIC CO LTD