| ??? 01/03/13 16:53 Modified: 01/03/13 17:06 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#189063 - Soft starting Responding to: ???'s previous message |
I dont think I can simply use a power contactor + back up fuse to start ?? Or can I ?? No you can't, you will always blow the fuse up or the power source because dc motor draws 5x the rated current at startup. You must use some sort of soft starting. Since you don't need speed control why not build a soft starter yourself, all you need is a microcontroller to generate PWM starting from 0 PWM to 100% in 20 seconds say. And use a gate drive and IGBT. Don't forget the DC link capacitor to protect the IGBT from BEMF. Last week I installed a commercial 350A digital dc drive for a client, it is amazing how much technology in it. The thing I liked most is the autotune feature, it measures the motor parameters like armature resistance, inductance, flux and calculates the PID parameters and stores the values in the drive. Mahmood |
| Topic | Author | Date |
| Starting a 110V DC / 10KW motor | 01/01/70 00:00 | |
| RE | 01/01/70 00:00 | |
| Back to basics ! | 01/01/70 00:00 | |
| Soft starting | 01/01/70 00:00 | |
| Good ideas.. | 01/01/70 00:00 | |
| more | 01/01/70 00:00 | |
| IGBTs and money | 01/01/70 00:00 | |
| A very practical tip. Thanks. | 01/01/70 00:00 | |
| 110VDC | 01/01/70 00:00 | |
| All on the module ! | 01/01/70 00:00 | |
COMPLETE saturation | 01/01/70 00:00 |