Electric motor

Details Electric motor Electric motor

2009-06-15

2011-11-08

Ip, Paul (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S254100, C318S434000, C318S400010, C318S400070

Reexamination Certificate

active

08054020

ABSTRACT:
An electric motor has a DC link circuit (30, 32), a permanent-magnet rotor (104), and a control circuit having a full bridge (114). A program-controlled calculation arrangement (80) is configured to supply the semiconductor switches of a first bridge half with a PWM signal (136, 136′) and to supply the semiconductor switches (118, 122) of the second bridge half with a commutation signal (O1, O2; 150, 150′). An energy storage device (170) is provided which, during normal operation of the motor (102), is chargeable from the DC link circuit (30, 32) and serves, upon cessation of the signals from the calculation arrangement (80), to make the semiconductor switches (118, 122) of the other bridge half conductive, and thereby to short-circuit the stator winding arrangement (106) through those semiconductor switches (118, 122) in order to decelerate the permanent-magnet rotor (104) and to thereby minimize risk of human injury.

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