6
8
5
4
3
3
2
7
1
1
Rear
Front
Front
8
9
7
10
8
8
9
4 5
6
Hall sensor circuit The open collector output of Hall sensors does not normally have its own pull-up resistance, as this is integral in maxon controllers. Any excep- tions are specifically mentioned in the relevant motor data sheets.
Winding arrangement The winding is divided into 3 partial windings which have several stator teeth each. The partial windings can be connected in two different manners - “Y” or “Δ”. This changes the speed and torque inversely proportional by the factor 3 . However, the winding arrangement does not play a decisive role in the selection of the motor. It is important that the motor-specific parameters (speed and torque constants) are in line with requiremenats.
Sinusoidal commutation Sinusoidal commutation or field-oriented control (FOC) for EC motors with grooved wind- ing is possible. The main benefit of sinusoidal commutation − the smooth operation − only comes into play to a limited degree due to the detent.
Wiring diagram for Hall sensors Hall sensor supply voltage
R Pull-up
Control circuit
Hall sensor output
« ∆ »-circuit
«Y»-circuit
W 1
W 1
U 1-2
U 3-1
U 1-2
U 3-1
GND
W 2
W 2
The power consumption of a Hall sensor is typically 4 mA (for output of Hall sensor = “HI”).
W 3
W 3
U 2-3
U 2-3
Bearings and service life The long service life of the brushless design can only be properly exploited by using pre- loaded ball bearings. − Bearings designed for tens of thousands of hours − Service life is affected by maximum speed, residual imbalance and bearing load
Legend 1 Star point 2 Time delay 30° 3 Zero crossing of EMF
Technology – short and to the point 67 For further explanations, please see page 188 or “The selection of high-precision microdrives” by Dr. Urs Kafader.
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