Extended Summary 本文は pp.1531–1538 Study of New Start Method for Position Sensorless Brushless DC Motor Yukio Kawabata Member (Hitachi, Ltd., [email protected]) Tsunehiro Endo Member (Hitachi, Ltd., [email protected]) Takakura Yuhachi Non-member (Hitachi Home & Life Solutions, Inc.) Ishii Makoto Non-member (Hitachi Home & Life Solutions, Inc.) Keywords: brushless DC motors, sensorless, back electromotive force, PWM control A lot of brushless DC motors are adopted in the compressor of the air conditioner and the refrigerator because of the maintenance-free and highly effective. And, sensorless drive using back electromotive force (EMF) is widely used for these motor controls. However, it is very difficult to apply the sensorless drive at the start sequence because the EMF is too low to detect. Therefore, an open loop drive that controlled by fixed switching pattern is used at the start sequence. After acceleration up to the appropriate speed, the drive method switches to the sensorless drive from the open loop drive. This start sequence has some problems. The motor output torque and the rotational speed change greatly when the motor is driven by an open loop control, and it causes the vibration. Furthermore, it is important to adjust the switching patterns of the open loop appropri- ately. If it is not adjusted appropriately, the switch to the sensorless drive may fail. In this paper, we propose new start method suitable for sensorless brushless DC motor drive systems. The proposed method introduces new switching patterns at the start point. The switching patterns are determined by motor parameters. Using this method, the open loop drive sequence can be eliminated. Fig. 1 shows the simulation result of the motor output torque and the rotational speed of conventional open loop start method. The motor output torque and rotational speed change greatly and the vibration occurs after the start. Fig. 2 shows the simulation result of the motor torque output and the rotational speed of new start method. The motor output torque and the rotational speed are smooth from the start. Fig. 3 shows the experimental result that shows applied voltage and the motor current waveform at the start. Fig. 1. Simulation result of conventional open loop start method (Load torque: 50%) The smooth acceleration is obtained using the proposed method. As mentioned above, we has proposed new start method for brushless DC motors. Rapid acceleration and high performance can be achieved. The simulation and experimental results demonstrated the validity of the proposed method. (a) Motor output torque, Rotational speed, Applied voltage (b) Voltage of terminal, Back EMF, Direct current Fig. 2. Simulation result of the proposed method (Load torque: 50%) Fig. 3. Experiment result of new start method (Load torque: 50%) –15–
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Extended Summary 本文は pp.1531–1538
Study of New Start Method for Position Sensorless Brushless DC Motor
Takakura Yuhachi Non-member (Hitachi Home & Life Solutions, Inc.)
Ishii Makoto Non-member (Hitachi Home & Life Solutions, Inc.)
Keywords: brushless DC motors, sensorless, back electromotive force, PWM control
A lot of brushless DC motors are adopted in the compressor of theair conditioner and the refrigerator because of the maintenance-freeand highly effective. And, sensorless drive using back electromotiveforce (EMF) is widely used for these motor controls.
However, it is very difficult to apply the sensorless drive at thestart sequence because the EMF is too low to detect. Therefore, anopen loop drive that controlled by fixed switching pattern is used atthe start sequence. After acceleration up to the appropriate speed,the drive method switches to the sensorless drive from the open loopdrive.
This start sequence has some problems. The motor output torqueand the rotational speed change greatly when the motor is driven byan open loop control, and it causes the vibration. Furthermore, it isimportant to adjust the switching patterns of the open loop appropri-ately. If it is not adjusted appropriately, the switch to the sensorlessdrive may fail.
In this paper, we propose new start method suitable for sensorlessbrushless DC motor drive systems. The proposed method introducesnew switching patterns at the start point. The switching patterns aredetermined by motor parameters. Using this method, the open loopdrive sequence can be eliminated.
Fig. 1 shows the simulation result of the motor output torque andthe rotational speed of conventional open loop start method.
The motor output torque and rotational speed change greatly andthe vibration occurs after the start.
Fig. 2 shows the simulation result of the motor torque output andthe rotational speed of new start method.
The motor output torque and the rotational speed are smooth fromthe start.
Fig. 3 shows the experimental result that shows applied voltageand the motor current waveform at the start.
Fig. 1. Simulation result of conventional open loop start method(Load torque: 50%)
The smooth acceleration is obtained using the proposed method.As mentioned above, we has proposed new start method for
brushless DC motors. Rapid acceleration and high performance canbe achieved. The simulation and experimental results demonstratedthe validity of the proposed method.
(a) Motor output torque, Rotational speed, Applied voltage
(b) Voltage of terminal, Back EMF, Direct current
Fig. 2. Simulation result of the proposed method(Load torque: 50%)
Fig. 3. Experiment result of new start method(Load torque: 50%)
– 15 –
論 文
位置センサレス・ブラシレスDCモータの新起動法に関する検討
正 員 川端 幸雄∗ 正 員 遠藤 常博∗
非会員 高倉 雄八∗∗ 非会員 石井 誠∗∗
Study of New Start Method for Position Sensorless Brushless DC Motor
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