US 11,933,308 B2
Pump assembly and method for controlling an electric motor for driving an impeller of a pump unit of a pump assembly
Martin Byskov Skafsgaard, Bjerringbro (DK); Susanne Hamann Gade, Bjerringbro (DK); Keld Benner Valbjørn, Bjerringbro (DK); and Jan Carøe Aarestrup, Bjerringbro (DK)
Assigned to GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Filed on Dec. 14, 2021, as Appl. No. 17/550,396.
Claims priority of application No. 20214690 (EP), filed on Dec. 16, 2020.
Prior Publication US 2022/0186733 A1, Jun. 16, 2022
Int. Cl. F04D 15/00 (2006.01); F04D 13/06 (2006.01); H02P 7/29 (2016.01)
CPC F04D 15/0066 (2013.01) [F04D 13/06 (2013.01); H02P 7/29 (2013.01); H02P 2207/05 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A pump assembly comprising:
a pump unit comprising an impeller configured to pump fluid;
an electric motor for driving the impeller;
a control module configured to control a speed of the electric motor in a control mode; and
an interface configured to receive a pulse width modulated (PWM) control signal with a duty cycle indicative of the speed of the electric motor, wherein the control module is configured to interpret the PWM control signal at start-up of the electric motor per default in a configuration mode as a configuration bit sequence based on the duty cycle of the PWM control signal during a pre-determined configuration window, wherein the control module is configured to extend a length of the configuration window at least until the control module has received a full and valid configuration bit sequence under a condition that a valid synchronization sequence was detected in the interpreted configuration bit sequence.