The magnetoresistive power generation system of the switch is by magnetoresistive electrical machinery, two-way power inverter, trochanter position detector or non- direct position detector of one pair of salient poles And the control device makes up. The intersection of power generating and according to the intersection of trochanter and the intersection of position and the intersection of signal control and the intersection of power and make-and-break of gas switching tube under switching circuit that position detector produce of electrical machinery control system, the production position that changes phase current, make electromagnetic torque enable machinery to turn into the electric energy as being negative. The electrical machinery is 12/8 of the structure, there is not coil at the trochanter, each tooth of stator has a centralized coil very much, relative two loop formation and a pair of magnetic pole radially, it is ” one-phase ” to be called . So make up 6 phases altogether, can meet demands of magnetoresistive power generation system of the two channel switch. This research takes single channel as examples, explain its operating principle and control method briefly.

The reluctance generator working condition electric current waveform of the switch is shown as in Fig. 1. In the 1 Fig., corner define the intersection of looks and the intersection of trochanter and the intersection of tooth and the intersection of trough axis and the intersection of wired and and the intersection of stator and the intersection of tooth and included angle between shaft axis very much this as. As the shaft axis reclosing of rotor slot, inductance of this looks is minimum define as =0 degrees ,The shaft axis is coincided very much in the corresponding stator tooth of wired and of polar axis of trochanter tooth define = m When, the inductance maximum of this looks. According to the basic theories of electromagnetic field, follow the existence of the magnetic field, the electromagnetic torque of the electrical machinery trochanter coexists, can be expressed as:

If form the electric current in the dropping area of the inductance, produce and shoulder running torque, the electrical machinery absorbs the mechanical energy promptly, and may convert it to the electric energy to export, so the magnetoresistive electrical machinery of the switch works for the generator at this moment.

There are more magnetoresistive electrical machinery control parameters of switches, it is flexible to control, this is one of the advantages of a magnetoresistive electrical machinery of a switch too. Have 3 kinds of commonly used control schemes as to the magnetoresistive power generation system of the switch: Modulating control of the pulse width, angle position control and electric current chopping are controlled. What the control system designed in this research used is an angle position control scheme. The phase current waveform is knowing according to Fig. 1, 1 and 2, respectively in order to open the angle and shut off the angle, namely the corresponding trochanter position angle, regulate agitation course and phase current that can influence generating electricity to it when the main gas switching tube is opened and shut off. Usually open angle theta 1 in the rising area of the inductance promptly before m, shut off angle theta 2 in the dropping area of the inductance promptly after m, open the angle ahead of time, shut off the angles and can all increase the time of exciting, increase the exciting current ic after pushing away, thus strengthen and encourage the magnetic intensity. Advantage that angle control electrical machinery running torque control band large running high in efficiency, the shortcoming is not to very suitable for low speed. When the rotational speed is reduced, the rotational electromotive force is reduced, make the electric current crest value increase and must carry on the current limiter, so the general application used for great of rotational speed of position control of angle.