First a bit of history.
In Europe, about 20-30 years ago the standard voltage for AC household voltage supply was 220 V. About 10-15 years ago it has changed to 240 V and now since 2008 (by the EU standards) it is defined as a compromise between these two values to 230 V (+-5%).
The maximum deviation from the standard value of 230 V is
`Delta(V) = 5%*230 =5/100 *230 =11.5 V`
which means that the maximum and minimum are
`V_min = 230-11.5 = 218.5 "Volts"`
`V_max =230+11.5 =241.5 "Volts"`
For the motor the voltage tolerance is
`Delta(V) =10%*220 =10/100*220 =22 "Volts"`
which means that the operating voltage for the motor are in the range
`V_min =220-22= 198 "Volts"`
`V_max =220 +22 =242 "Volts"`
Since the operating voltage range for the motor is greater than the voltage an AC household voltage supply can have it means that always the motor is working within its the acceptable voltage range.
Further Reading
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