10
Rev. 1.0
10/15/2010
STM17Q User Manual
2.3.2 Current
The maximum supply currents required by the STM17Q are shown in the charts below at different
power supply voltage inputs. The STM17Q power supply current is lower than the winding currents
because it uses switching ampliers to convert a high voltage and low current into lower voltage
and higher current. The more the power supply voltage exceeds the motor voltage, the less cur-
rent will be required from the power supply.
It is important to note that the current draw is signicantly different at higher speeds depending on
the torque load to the motor. Estimating how much current is necessary may require a good analy-
sis of the load the motor will encounter.
0 10 20 30 40 50
Speed(RPS)
0
0.2
0.4
0.6
0.8
1
1.2
)A(tnerruC ylppuS
Torque
0
35
70
105
140
175
210
245
280
(euqroT
Supply Current
(Full Load)
Supply Current
(No Load)
STM17Q-1AN
Supply Current at 12 volts, 1.8 amps
0 10 20 30 40 50
Speed(RPS)
0
0.2
0.4
0.6
0.8
1
1.2
)A(tnerruC ylppuS
STM17Q-1AN
Supply Current at 24 V, 1.8 amps
Torque
0
35
70
105
140
175
210
245
280
(euqroT
Supply Current
(Full Load)
Supply Current
(No Load)