maxon Product Range 2021/22

8 6

4 5

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 “ D ”. 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 supplyvoltage

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

März 2021 edition / subject to change Legend 1 Star point 2 Time delay 30° 3 Zero crossing of EMF

For further explanations, please see page 178 or “The selection of high-precision microdrives” by Dr. Urs Kafader.

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Technology – short and to the point

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