EC Motors: Overview
| Power supply | DC | Battery supply possible |
|---|---|---|
| Driver electronics need | Yes | External or inside motor |
| Speed accuracy | Low | Effected by load torque Manufacture tol ±10% of no load speed |
| Speed control | Voltage ↕ | Driver output voltage controlled by PWM Closed loop - using integrated Hall sensors |
| Position control | High effort | Closed loop position control and sensor need Possible Hall sensors applicable |
| Overloadablity / load inertia | High | High start torque or peak load torque Able to accelerate high load inertia |
| Lifetime | High | Only limited by bearings Depends on lateral force and speed |
| Speed range [rpm] | 1500...25000 | For no load speed |
| Efficiency | 65...90% | At operating point of max. efficiency |
| Power vs. size | High | |
| Winding thermal protection | Need | If overload (mechanical blocking) not excluded - Current limitation in driver circuitry |
| Load sensing | Easy | Current rises with load |
| Stalling permissible | No | No or only short time (winding overheat) |
| Electromag.interference EMI | Not Critical | No brushes; PWM voltage may cause EMI |
| Braking/Holding torque | Low/Medium | Motor can be designed for low or medium detent torque Dynamic braking by winding short cut |
| Linear motors from JE | No |
