Resonant motor unit and electric device with resonant motor unit
First Claim
1. A resonant motor unit comprising:
- a resonant motor;
a control unit for driving the resonant motor at a driving frequency, for short-circuiting the resonant motor during a first short-circuiting phase in successive driving cycles and for concluding the at least first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles;
a measurement unit for successively measuring at least a first voltage signal provided by the resonant motor at the predetermined first time instant; and
an evaluation unit for determining whether the first voltage signal has changed between successive measurements.
1 Assignment
0 Petitions
Accused Products
Abstract
A resonant motor unit that has a resonant motor, a control unit, a measurement unit, and an evaluation unit is described. The control unit drives the resonant motor at a driving frequency, short-circuits the resonant motor during at least a first short-circuiting phase in successive driving cycles and concludes the first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles. The measurement unit successively measures at least a first voltage signal provided by the resonant motor at the predetermined first time instant, and the evaluation unit for determines whether the first voltage signal has changed between successive measurements.
-
Citations
15 Claims
-
1. A resonant motor unit comprising:
-
a resonant motor; a control unit for driving the resonant motor at a driving frequency, for short-circuiting the resonant motor during a first short-circuiting phase in successive driving cycles and for concluding the at least first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles; a measurement unit for successively measuring at least a first voltage signal provided by the resonant motor at the predetermined first time instant; and an evaluation unit for determining whether the first voltage signal has changed between successive measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of controlling a resonant motor, the method comprising the steps of:
-
driving the resonant motor at a driving frequency; short-circuiting the resonant motor during a first short-circuiting phase; switching off a current flow through the resonant motor at least at a predetermined first time instant; measuring at least a first voltage signal provided by the resonant motor at the predetermined first time instant; and evaluating whether the first voltage signal has changed between successive measurements. - View Dependent Claims (12, 13, 14, 15)
-
Specification