| 发明名称 | Power tool for performing soft-start control appropriated for motor load | ||
| 摘要 | A power tool has a motor, a power supply unit, a trigger unit, a control unit, and a motor load detection unit. The power supply unit supplies power to the motor. The trigger unit causes the power supply unit to start applying a voltage to the motor. The control unit controls the power supply unit to increase the voltage to the motor at a constant increasing rate. The motor load detection unit detects a motor load. The control unit changes the constant increasing rate in accordance with the motor load. | ||
| 申请公布号 | US8931576(B2) | 申请公布日期 | 2015.01.13 |
| 申请号 | US201113109860 | 申请日期 | 2011.05.17 |
| 申请人 | Hitachi Koki., Ltd. | 发明人 | Iwata Kazutaka |
| 分类号 | B25F5/00 | 主分类号 | B25F5/00 |
| 代理机构 | Kilpatrick Townsend & Stockholm LLP | 代理人 | Kilpatrick Townsend & Stockholm LLP |
| 主权项 | 1. A power tool comprising: a motor; a power supply unit that supplies power to the motor; a trigger unit that causes the power supply unit to start applying a voltage to the motor; a control unit that controls the power supply unit to increase the voltage to the motor at a constant increasing rate; and a motor load detection unit that detects a motor load, wherein the control unit changes the constant increasing rate in accordance with the motor load, wherein the control unit comprises a determination unit that determines whether the motor load is heavy or light, wherein the control unit increases the constant increasing rate if the determination unit determines that the motor load is light. | ||
| 地址 | Tokyo JP | ||