TW222038B - Motor speed control circuit - Google Patents

Abstract

One type of magnetic-field current-dividing motor speed control circuit by multiple-level serious-excited magnetic-field winding with transient energy-storing effects mainly consists of multiple sets of serious-excited magnetic-field winding with middle-tapping and power between which blocking diode is serially connected, then connected to energy-storing diodes and capacitors in prarallel. Between the power and tapping one current-dividingswitch component is connected in parallel used as carrier wave manipulation. When the manipulation switch is off, the current of motor armature flows through the serious-excited magnetic-field winding. When the manipulation switch is on, the current of switching power component divides through the serious-excited magnetic-field winding into armature or directly into armature. The magnetic-field maintains its excitation by energy-storing component and raises the voltage of armature in keeping stable intensity of magnetic-field excitation flux by manipulating the on/off interval ratio of each current-dividing switch component. Its main structures have: 11. serious-exciting (or multiple-exciting) motor made of at least one set of serious-excited magnetic-field winding (S101) with middle-tapping and armature(A101) in serious connection. The serious-excited magnetic-field winding(S101)can be connected with flying-wheel diode(C101) or further energy-storing capacitor(C101) in parallel. The armature(A101) can be connected with flying-wheel diode(CR103) or omitted. 2. blocking diode(CR101) is connected with the above serious- excited magnetic-field winding(S101)in forward direction in order to make the positive end of power connected to the serious-excited magnetic-field winding(S101)through the blocking diode and the armature(A101) connected to the negative end of power. 3. one or more than one set of solid-state switch component(Q101-Qn) made of solid-state switch transistor or thyristor and its positive end of forward conducting current is directly connected to the positive end of power in parallel. Its output end is connected to the junction point of serious-excited magnetic-field winding(S101) and armature(A101) or middle-tapping of serious-excited winding or multiple sets of serious-excited magnetic-field winding tapping matched with multiple sets of current-dividing switch components used for choosing the corresponding numbers of manipulation winding. Solid-state component(Q101) can be further connected to auxiliary excitation winding in series. 4. central control unit(CCU101) used to generate periodic driving signal in open-circuit or correspoinding on/off driving pulse to manipulate one of the solid-state switch components(Q101-Qn) or alternating on/off by driving two or more than two sets of the components depending on the setting or feedback value. 5. rotation speed detector(SD101) could be analog or digital type, coupled with armature(A101) and send the speed to the central contrl unit(CCU101). The rotation speed detector(SD101) could be replaced with armature anti-potential detecting device(EMFD101) to provide rotation speed reference signal. 6. load current detecting device(ID101) could be analog or digital type signal sent to central control unit(CCU101). 7. operation interface(DP101) used as human or electric signal input interface to manipulate CCU101 to control the speed of motor. The above circuit can be applied to both serious-excited and multiple-excited winding of motors.