Abstract: A seal plate (2) seals an opening part of a capacitor case (an exterior case 52) and includes a main body part (4) including a through-hole (8) for discharging a gas (G) in the capacitor case, a pressure valve (12) arranged to cover the through-hole and including a valve body part (26) allowing passage of the gas, a storage part (16) formed in the through-hole to receive the valve body part expanded due to a pressure in the capacitor case, and a stopper (stopper wall 10) that includes an opening part (20) for discharging the gas passing through the valve body part and that comes into contact with a portion of the valve body part in the storage part to deform the valve body part. This achieves an increase in gas permeability of the pressure valve and a high operating pressure maintained in the pressure valve.

Abstract: A seal plate (2) seals an opening part of a capacitor case (an exterior case 52) and includes a main body part (4) including a through-hole (8) for discharging a gas (G) in the capacitor case, a pressure valve (12) arranged to cover the through-hole and including a valve body part (26) allowing passage of the gas, a storage part (16) formed in the through-hole to receive the valve body part expanded due to a pressure in the capacitor case, and a stopper (stopper wall 10) that includes an opening part (20) for discharging the gas passing through the valve body part and that comes into contact with a portion of the valve body part in the storage part to deform the valve body part. This achieves an increase in gas permeability of the pressure valve and a high operating pressure maintained in the pressure valve.

Abstract: An electric compressor having a compression mechanism, an electric motor for driving the compression mechanism, and a housing for containing the compression mechanism and the electric motor. An opening formed in the housing is closed with a lid member to which a sealed terminal is attached, and an electroconductive pin of the sealed terminal is fitted into a socket connected to a lead wire of the electric motor. The socket is embedded in an insulative member, and the electroconductive pin of the sealed terminal is inserted into a hole formed in the insulative member and is fitted into the socket. An insulation section that surrounds the base portion of the electroconductive pin and the insulative member hold a ring member that is formed from an insulative elastic material and surrounds the electroconductive pin, and this portion held is sealed and insulated by elastic deformation of the ring member.

Abstract: An electric compressor having a compression mechanism, an electric motor for driving the compression mechanism, and a housing for containing the compression mechanism and the electric motor. An opening formed in the housing is closed with a lid member to which a sealed terminal is attached, and an electroconductive pin of the sealed terminal is fitted into a socket connected to a lead wire of the electric motor. The socket is embedded in an insulative member, and the electroconductive pin of the sealed terminal is inserted into a hole formed in the insulative member and is fitted into the socket. An insulation section that surrounds the base portion of the electroconductive pin and the insulative member hold a ring member that is formed from an insulative elastic material and surrounds the electroconductive pin, and this portion held is sealed and insulated by elastic deformation of the ring member.

Abstract: A brushless dc motor unit has 3-phase armature windings, a permanent-magnet rotor, a dc power supply having a motor drive voltage and a midpoint voltage that is one half of the motor drive voltage, and an electronic commutation circuit. Back emf voltages at armature winding terminals are individually delayed by less than 90.degree. and the delayed voltages are individually provided to the positive input terminals of voltage comparators. To the negative input terminals of the comparators is commonly provided a sawtooth-wave comparator reference voltage having a frequency proportional to a current rotor speed and an amplitude whose center voltage is the midpoint voltage. Outputs of the comparators cause a control circuit to transmit signals to control the electronic commutation circuit so as to provide 3-phase dc power to the armature windings.

Abstract: An inverter circuit including an inverter driving circuit and a plurality of pairs of switching elements coupled to a DC power source. The inverter driving circuit includes first and second gate driving circuits. The first gate driving circuit with a pulse transformer is coupled to a first switching element of each pair of switching elements, the latter of which is coupled to the positive side of the DC power source. The second gate driving circuit uses a non-induction control device, and is coupled to a second switching element of each pair of switching elements, the latter of which is coupled to the negative side of the DC power source. The total number of power sources required for the inverter driving circuit can be greatly decreased by using first gate driving circuits requiring no power source, as compared with that of a conventional inverter driving circuit constituted only by second gate driving circuits.