Setting the motor data
Prior to commissioning, the motor controller requires a number of values from the motor data sheet.
- Number of pole pairs: Object 2030h:00h (pole pair count) The number of motor pole pairs is to be entered here. With a stepper motor, the number of pole pairs is calculated using the step angle, e.g., 1.8° = 50 pole pairs, 0.9° = 100 pole pairs (see step angle in motor data sheet). With BLDC motors, the number of pole pairs is specified directly in the motor data sheet.
- Setting the motor current / motor type:
- Stepper motor only: Object 2031h:00h: Rated current (bipolar) in mA (see motor data sheet)
- BLDC motor only:
- Object 2031h:00h Peak current in mA (see motor data sheet)
- Object 203Bh:01h Rated current in mA (see motor data sheet)
- Object 203Bh:02h Maximum duration of the peak current in ms (for initial commissioning, a value of 100 ms is recommended; this value is to be adapted later to the specific application).
- Object 3202h:00h (Motor Drive Submode Select): Defines motor type BLDC: 00000041h
Due to the sine commutation and the sinusoidal current flow, the current of a motor winding can achieve an alternating current value that is briefly greater (by max. √2 times) than the set current.
At especially slow speeds or while at a standstill with full load, one of the windings can therefore be supplied with overcurrent for a longer period of time. Take this into account when dimensioning the motor and select a motor with larger torque reserve if necessary if required by the application.