JPH04172943A - Starter/generator - Google Patents

Abstract

PURPOSE:To obtain a highly efficient high power starter/generator by providing a rotor comprising a permanent magnet disposed at the outside of a stator and a rotor core disposed at the inside of the stator, and a rotor exciting winding surrounded by a rotor core. CONSTITUTION:When a starter/generator is operated as an engine starter, first and second windings (31, 32) and an exciting winding 6 are conducted. A rotor core 5 is imparted with rotating force from a stator core 3 and the exciting winding 6 for rotor whereas a permanent magnet 4 is imparted with rotating force from the stator core 3 thus rotating the output shaft 11 of engine. When the starter/generator is operated as a generator, the output shaft 11 of engine is rotated through an engine 1 to cause rotation of the rotary permanent magnet 4 and the rotor core 5 coupled therewith thus taking out power from the first and second windings (31, 32) and the exciting winding 6 for rotor. Since the permanent magnet 4 increases exciting flux, starting power and power generation can be increased. Furthermore, since the exciting current is not increased, exciting loss does not increase nor the efficiency lower.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter/generator that operates as a starter when an engine is started and as a generator after starting.

[Prior Art] Japanese Unexamined Patent Publication No. 63-202255 discloses a rotating field pole directly connected to the crankshaft of an engine, a field coil disposed so as to be surrounded by the field pole, and further including a field pole. A starter-generator with an armature core and an armature coil on the outside is described.

[Problems to be Solved by the Invention] However, in the starter/generator described above, there is a drawback that efficiency deteriorates when an attempt is made to increase the excitation magnetic flux by increasing the excitation current in order to increase the output.

It is generally accepted that if an attempt is made to increase the excitation magnetic flux by using a permanent magnet, it will be difficult to control the output during power generation.

An object of the present invention is to provide a starter/generator that can provide high efficiency and high output.

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention provides an engine-directly connected starter/generator disposed between an on-vehicle engine and a transmission, the engine output shaft and A stator having a coaxial shaft and having a first winding provided on the inner circumferential side of an annularly arranged iron core and a second winding provided on the outer circumferential side; A rotor comprising a permanent magnet disposed outside the stator and a rotor core disposed inside the stator, and a rotor excitation winding surrounded by the rotor core of the rotor. A configuration was adopted.

[Function and Effects of the Invention] (Function) When used as an engine starter, the first and second windings and the excitation winding are energized. The rotor core receives rotational force from the stator core and the rotor excitation winding, and the permanent magnet receives rotational force from the stator core, causing the engine output shaft to rotate.

When used as a generator, the engine rotates the engine output shaft, the rotating permanent magnet and rotor core rotate in conjunction with the engine output shaft, and power is generated from the first and second windings and the rotor excitation winding. taken out.

(Effect) Since the excitation magnetic flux is increased by the permanent magnet, the starting output and the amount of power generation can be improved. Note that since the excitation current is not increased, excitation loss does not increase and efficiency does not decrease.

[Example] Next, an example of the present invention will be described based on FIG.

In FIG. 1, A is a starter/generator disposed between an on-vehicle engine 1 and a transmission 2, 11 is an engine output shaft,
21 is a pump impeller housing which is an input shaft of the transmission 2; 211 is a boss thereof; 12 is a housing having a cross section that is screwed to the engine block; 22 is a housing that is joined to the housing 12 and is connected to the transmission 2; It is a protective transmission case.

The starter/generator A includes a stator core 3, a permanent magnet 4, a rotor core 5, and a rotor excitation winding 6.

The stator core 3 has a ring shape and is connected to the engine output shaft 11.
It is arranged coaxially with the housing 12, has openings for storing the winding wire on the inner peripheral surface and the outer peripheral surface, and is fixed by a screw 13 at a position close to the side inner wall 121 of the housing 12. Incidentally, winding groups 31 and 32 are wound around each of the winding storage openings.

The permanent magnet 4 is attached to the pump impeller housing 21 with a screw 2.
A plurality of cylindrical rotating members 24 are fixed to the inner wall of the cylindrical rotating member 24 fixed by the housing 21, and rotate together with the housing 21.

The rotor core 5 has a ring shape and is fixed to the drive plate 14 and the housing 21 by screws 15.25.

Note that the drive plate 14 is fixed to the engine output shaft 11 by a screw 16.

The rotor excitation winding 6 is formed by winding a conducting wire around a circular iron core 61 fixed to the engine block side wall 122 of the housing 12 by a screw 17.

Next, the operation of the starter/generator A will be explained.

■ When used as an engine generator When used as a generator, the output shaft 11 rotates, the rotor core 5 is connected to the drive plate 14 and the housing 21, and the permanent magnet 4 is connected to the housing 21 and the cylinder. Via the rotating member 24,
Each rotates in connection with the output shaft 11.

All of the power generated by the winding group 32 is supplied to a regular electrical load such as an ignition device (power consumption is constant), and the shortage is made up for by the power generated by the winding group 31.

The magnetic force of the permanent magnet 4 and the degree of winding of the winding group 32 are set so that the maximum value of the electric power taken out from the winding group 32 becomes the electric power value of the regular electric load.

The power for battery charging and the power for variable electrical loads is
It is covered by the power generated by the winding group 31 and the rotor excitation winding 6. Incidentally, by adjusting the current value flowing through the rotor excitation winding 6 with a voltage regulator, the amount of all power generation is controlled according to the required load amount. Incidentally, the variable electric load is an electric appliance whose power consumption fluctuates depending on the usage condition, such as a wiper, various lights, power windows, and an audio device.

■When used as an engine starter, the power from the battery is converted into three-phase AC by a converter and supplied to the winding group 31, 32, and the excitation winding 6 for the rotor is supplied via the energization controller.
energize.

The permanent magnet 4 is given a rotational force by the stator core 3, and at the same time, the rotor core 5 is connected to the stator core 3 and the rotor excitation winding 6.
Rotational force is applied from.

The cylindrical rotating member 24 rotationally drives the housing 21, and the rotor core 5 rotationally drives the drive plate 14 and the housing 21, respectively, so the output shaft 11 rotates and the engine 1 starts.

Next, the effects of the starter/generator A will be described.

(A) Since the excitation magnetic flux is increased by the permanent magnet 4 fixed to the inner wall of the cylindrical rotating member 24, it is possible to improve the starting torque during starting and the amount of power generated during power generation. Note that since the excitation current is not increased, excitation loss does not increase and efficiency does not decrease.

(a) Open grooves for storing the windings are provided on the inner and outer circumferential surfaces of the stator core 3, and the winding groups 31 and 32 are wound therein, so that the winding groups 31 and 32 are wound without occupying much space. can be made smaller.

(1) The winding condition of the winding group 32 is set so that the maximum value of electric power taken out from the winding group 32 becomes the power value of the regular electric load, and the shortfall is compensated for by the power generated by the winding group 31. ing. Therefore, there is no need to provide a means for controlling the amount of power generated by the stator core 3 and the permanent magnets 4.

(1) Cranking is performed by the sum of the electric torque generated by the permanent magnet 4 and the stator core 3 (based on the winding groups 31 and 32) and the electric torque generated by the rotor excitation winding 6 and the rotor core 5. Because of the configuration, you can start the engine with plenty of time.

The present invention includes the following embodiments in addition to the above embodiments.

a. In the above embodiment, the cylindrical rotating member 24 is connected to the housing 2.
1 with screws, it may be fixed to the rotor core 5 or drive plate 14.

51 fixing the rotor core 5 to the drive plate 14 and the housing 21, fixing the cylindrical rotating member 24 to the housing 21,
The fixation of the stator core 3 to the housing 12 and the fixation of the core 61 to the housing 12 may be performed by a method such as welding other than screw fixing.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a starter/generator in one embodiment of the present invention. In the diagram A...Starter/generator 1...Vehicle engine 2...Transmission 3...Stator core 4...Permanent magnet 5...Rotor core 6...For rotor Excitation winding 1
1... Engine output shaft 31... Winding group (first winding) 32... Winding group (second winding)

Claims (1)

[Claims] 1) An engine-directly connected starter/generator disposed between an on-vehicle engine and a transmission, which has the same axis as the engine output shaft and is arranged in an annular shape. a stator having a first winding provided on the inner circumferential side of the iron core and a second winding provided on the outer circumferential side; and a permanent magnet connected to the engine output shaft and disposed outside the stator. , a rotor core disposed inside the rotor; and a rotor excitation winding surrounded by the rotor core of the rotor.