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EP0503879A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Synchronous motor with permanent magnets and motor system

Assignee: Honda Motor Co Ltd
•
Filing: 1992-03-09
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Granted: —
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Expires: 2012-03-09
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Abstract

Abstract In a motor with permanent magnets and a motor system, the value α produced by dividing, by the induced voltage constant ke, the product of the inductance Lm of the motor itself or the inductance Ls of the motor system in the d-q coordinate system is selected to meet a predetermined condition. The range of rotational speeds in which the motor can be operated while maintaining a predetermined output (B)under field weakening control can be widened. If a condition is established to determine a ratio (K) by which the rated rotational speed (A) under normal operating-conditions can be divided into a rotational speed (KA) under field weakening control, then conditions for a motor or a motor system that can be used can be determined.

Inventors

  • 👤 Nobuyuki c/o Honda R & D Co. Ltd. Imai

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 09:58
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/06; H02P25/00; H02P25/02; H02P25/022; H02P25/03

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 109 words
A synchronous motor (3) with permanent magnets having an inductance La, a rated current Ip, and an induced voltage constant ke in a d/q-axis conversion system of the synchronous motor, characterized in that a value α produced by dividing the product of the inductance La and the rated current Ip by the induced voltage constant ke according to an equation (a) falls in a range represented by an inequality (b): La·Ip/ke = α (k²-1)² k²-1 ≦ α ≦ (k²+1)² k²-1 where k is a ratio by which a rated rotational speed can be multiplied to give a rotational speed for operation without reducing the output below the rated output.
Claim 2
Dependent Claim 18 words
A synchronous motor according to claim 1, wherein said value α represented by the equation (a) is 1.
Claim 3
Dependent Claim 127 words
A motor system (1) comprising a synchronous motor (3) with permanent magnets and a driver circuit for driving the synchronous motor, the motor system (1) having an inductance Ls, a rated current Ip, and an induced voltage constant ke in a d/q-axis conversion system of the motor system, characterized in that a value α produced by dividing the product of the inductance Ls and the rated current Ip by the induced voltage constant ke according to an equation (c) falls in a range represented by an inequality (d): Ls·Ip/ke = α (k²-1)² k²-1 ≦ α ≦ (k²+1)² k²-1 where k is a ratio by which a rated rotational speed can be multiplied to give a rotational speed for operation without reducing the output below the rated output.
Claim 4
Dependent Claim 18 words
A motor system according to claim 3, wherein said value α represented by the equation (c) is 1.
Claim 5
Dependent Claim 37 words
A motor system according to claim 3 or 4, further including correcting-inductances (5U, 5V, 5W) connected in series or parallel to windings (3U,3V,3W) of the synchronous motor (3) for making the inductance Ls satisfy the equation (c).

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