| 摘要 |
PURPOSE:To provide a controller of a parallel-connection DC motor which can simultaneously control each rotary speed of a plurality of DC motors which are connected in parallel for a single DC power supply in a safe state without using a high breakdown voltage switching element or a special protection circuit. CONSTITUTION:The controller of a parallel-connection DC motor simultaneously controls each rotary speed of a first DC motor for driving and a second DC motor for loading and unloading which are connected in parallel with a battery in a battery fork lift using periodical first pulse wave P1 and second pulse wave P2. For example, the ratio of the period of the first pulse wave P1 to the second pulse wave P2 is set to an integral multiple, such as 1 and 2, and the generation start delay of the second pulse wave P2 is shifted from the generation start time of the first pulse wave P1 by approximately several mS. |
