IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0901123
(2004-07-29)
|
우선권정보 |
JP-P2003-317880(2003-09-10) |
발명자
/ 주소 |
- Iimura,Yoshio
- Orikasa,Hiroaki
- Sunaoshi,Mitsuhiro
- Segawa,Kazuhiro
|
출원인 / 주소 |
|
대리인 / 주소 |
McGinn IP Law Group, PLLC
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
8 |
초록
▼
An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion including the motor, a controller po
An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion including the motor, a controller portion controlling the drive portion and a pressure sensor detecting an air pressure of the compressed air in the tank unit, in which the controller portion controls a rotation speed of the motor at multiple levels based on a detection signal P1 of the pressure sensor, a first differential signal which is a differential value d(P 1)/dt of the detection signal P1, and a second differential signal which is a differential value d(P2)/dt of a detection signal P2 obtained by removing a pulsatory element from the detection signal P1.
대표청구항
▼
What is claimed is: 1. An air compressor comprising: a tank unit storing a compressed air used by a pneumatic tool; a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit; a motor driving the compressed air generator; a drive portion includin
What is claimed is: 1. An air compressor comprising: a tank unit storing a compressed air used by a pneumatic tool; a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit; a motor driving the compressed air generator; a drive portion including the motor; a controller portion controlling the drive portion; and a pressure sensor detecting an air pressure of the compressed air in the tank unit, wherein the controller portion controls a rotation speed of the motor at multiple levels based on a detection signal P1 of the pressure sensor, a first differential signal which is a differential value d(P1)/dt of the detection signal P1, and a second differential signal which is a differential value d(P2)/dt of a detection signal P2 obtained by removing a pulsatory element from the detection signal P1. 2. The air compressor according to claim 1, further comprising: a temperature sensor detecting a temperature of the motor, wherein the controller portion controls the rotation speed of the motor at multiple levels in accordance with a detection signal of the temperature sensor, the detection signal P1 of the pressure sensor and the first and the second differential signals. 3. The air compressor according to claim 1, further comprising: a sensor detecting a power voltage and a load current of the drive portion, wherein the controller portion controls the rotation speed of the motor in accordance with a detection signal of the sensor which detects the power voltage and the load current of the drive portion, the detection signal P1 of the pressure sensor and the first and the second differential signals. 4. An air compressor comprising: a tank unit storing a compressed air used by a pneumatic tool; a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit; a motor driving the compressed air generator; a drive portion including the motor; a controller portion controlling the drive portion; and a pressure sensor detecting an air pressure of the compressed air in the tank unit, wherein the controller portion controls a rotation speed of the motor at multiple levels based on a detection signal P1 of the pressure sensor, a first differential signal which is a differential value d(P1)/dt of the detection signal P1, and a second differential signal obtained by supplying the first differential signal to a low-pass filter. 5. The air compressor according to claim 4, further comprising: a temperature sensor detecting a temperature of the motor, wherein the controller portion controls the rotation speed of the motor at multiple levels in accordance with a detection signal of the temperature sensor, the detection signal P1 of the pressure sensor and the first and the second differential signals. 6. The air compressor according to claim 4, further comprising: a sensor detecting a power voltage and a load current of the drive portion, wherein the controller portion controls the rotation speed of the motor in accordance with a detection signal of the sensor which detects the power voltage and the load current of the drive portion, the detection signal P1 of the pressure sensor and the first and the second differential signals. 7. A control method for an air compressor that includes a tank unit storing an compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion including the motor, and a controller portion controlling the drive portion, the control method comprising: detecting a compressed air pressure P1 in the tank unit; detecting a differential signal d(P1)/dt of the pressure P1; detecting a differential signal d(P2)/dt of a pressure change signal P2 from which a pulsatory element of the pressure P1 is removed; and controlling a rotation speed of the motor at multiple levels in accordance with the compressed air pressure P1 and the differential signals d(P1)/dt and d(P2)/dt. 8. The control method according to claim 7, further comprising: counting not less than a predetermined number of pulsations that occur during a predetermined period of time, wherein, the rotation speed of the motor is controlled when a count value is equal to or greater than the predetermined number of pulsations. 9. The control method according to claim 7, further comprising: detecting a motor temperature T; and controlling the rotation speed of the motor at multiple levels in accordance with the pressure P1, the differential signals d(P1)/dt and d(P2)/dt, and a detection signal of the motor temperature T. 10. The control method according to claim 7, further comprising: detecting a power voltage V and a load current I of the drive portion; and controlling the rotation speed of the motor at multiple levels in accordance with the power voltage V and the load current I, the pressure P1 and the differential signals d(P1)/dt and d(P 2)/dt.
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