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Method and apparatus for controlling pulse width modulation in an electric motor

A technology of pulse width modulation and electric motors, which is applied in the field of electric motors and can solve problems affecting the torque generation of switched reluctance motors

Inactive Publication Date: 2017-02-08
SHOP VAC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modifications to rotor pole faces are known to affect torque production in switched reluctance motors

Method used

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  • Method and apparatus for controlling pulse width modulation in an electric motor
  • Method and apparatus for controlling pulse width modulation in an electric motor
  • Method and apparatus for controlling pulse width modulation in an electric motor

Examples

Experimental program
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Effect test

Embodiment Construction

[0034] refer to figure 1 and figure 2 Thus, switched reluctance motor 10 may be constructed as a package or unit of subassemblies, each of which may be preassembled individually and brought together during the manufacturing process. Specifically, the motor 10 may include an upper housing unit 12 , a lower housing unit 13 , a stator 14 , a rotor 16 , a drive assembly 18 , a first end cover 20 and a second end cover 22 . The upper case unit 12 and the lower case unit 13 may be annular in shape, the first end cap 20 is connected to the upper case unit 12 , and the second end cap 22 is connected to the lower case unit 13 . like figure 1 and figure 2 As shown, each of the upper housing unit 12 , lower housing unit 13 , stator 14 , rotor 16 , drive assembly 18 , first end cap 20 and second end cap 22 may be combined into a single package or unit.

[0035] The upper housing unit 12 may include a plurality of holes 24 for receiving a plurality of fasteners 26 to secure the upper...

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PUM

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Abstract

In a method of controlling current in a control circuit of an electric motor, pulse-width modulation (PWM) pulses are applied to a stator of the electric motor, via a plurality of transistors of the control circuit, using a first control mode when a rotational speed of a rotor of the electric motor is within a first range. At least one PWM pulse is applied to the stator, via a subset of the plurality of transistors, using a second control mode when the rotational speed of the rotor is within a second range. When it is determined that the rotational speed of the rotor has changed from being within the second range to being within the first range, additional PWM pulses are applied to the stator such that, for each of the plurality of transistors, a current through the transistor does not exceed a maximum current capacity of the transistor.

Description

technical field [0001] The present disclosure relates generally to electric motors and, more particularly, to controlling pulse width modulated pulses for accelerating electric motors. Background technique [0002] A switched reluctance motor is an electric motor that includes a rotor and a stator. The torque of a reluctance motor is produced by the tendency of the rotor to move to a position relative to the stator where the reluctance of the magnetic circuit is minimized, ie the inductance of the energized stator winding is maximized. In a switched reluctance motor, circuitry is provided to detect the angular position of the rotor and to sequentially energize the phases of the stator windings according to the rotor position. [0003] A switched reluctance motor is a doubly salient motor with poles on both the stator and rotor, and has windings on the stator poles only. The rotor of a switched reluctance motor does not include a commutator or windings. In some cases, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/20H02P6/15H02P25/092
CPCH02P6/20H02P6/153H02P25/0925
Inventor 尼尔·N·诺雷尔
Owner SHOP VAC